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Electrospun polycaprolactone (PCL) nanofibers are often used as biomedical materials for drug release systems and tissue engineering scaffolds due to their biodegradability, but the hydrophobicity and mechanical defects limit the wider applications. Here, polybutyrolactam (PBL), a biodegradable polyamide with excellent mechanical properties and high moisture regain, was blended with PCL in co-solvent to electrospin fiber membranes with improved mechanical properties and the hydrophilicity. Scanning electron microscope (SEM), water contact angle measuring instrument, atomic force microscope (AFM), energy dispersive spectroscopy (EDS), transmission electron microscope (TEM), X-ray diffraction (XRD), thermogravimetric analyzer (TGA), differential scanning calorimetry (DSC), electronic universal tension machine were used to investigate the morphology, diameter and distribution of fibers, the hydrophilicity, crystallinity, thermal and mechanical properties of the fiber membranes. It was found that increasing the PBL content increased the fiber diameter, narrowed the diameter distribution, and significantly improved the hydrophilicity of the fiber membrane. PBL had been shown to be compatible with PCL, and the crystallinity of PCL/PBL electrospun fiber membranes with increasing PBL content was higher than that of monocomponent fiber membranes. Increasing the PBL content also slightly raised the melting point of the PCL component in the fiber membranes, while that of PBL remained unchanged. The crystallization temperatures of PBL and PCL, as well as the thermal stability of the fiber membranes decreased with increasing PBL content. The addition of PBL significantly improved the mechanical properties of electrospun fiber membranes. The greater PBL content was, the better the mechanical properties of the fiber membrane were. [ABSTRACT FROM AUTHOR]

Monodisperse SiO2 microspheres with particle size in the range of 208—368 nm were prepared by the Stöber method and used to construct structural color films via fast lifting method. The as-prepared structural color films were then embedded in polydimethylsiloxane (PDMS), on which polydopamine (PDA)-doped PDMS (PDMS-PDA) was coated to obtain stretchable color-changing PDMS/SiO2/PDMS-PDA photonic elastomer films. Both the structural color films and photonic elastomer films were explored with techniques including scanning electron microscope, nanoscale laser particle size analyzer, spectrophotometer, fiber optic spectrometer, tensile testing machine and digital camera to elucidate the microstructure and optical properties of the former and the strain response and mechanical properties of the latter. Results show that the structural color films belong to amorphous photonic crystals consisting of long-range disordered and short-range ordered arrangements of SiO2 microspheres, and their structural colors are angle-independent under diffuse light. But interestingly, the structural colors are angle-dependent under sunlight due to the surface of SiO2 microspheres arranged flatly As for the photonic crystal elastomer films surface-coated with a black PDMS-PDA layer, the saturation of the structural color of the films during stretching is greatly improved. When the tensile strain reaches 20%, the films start to show apparently structural color, which undergo a continuous blue-shift with increasing strain, and the color returns to the initial state when the strain is restored. Moreover, the film has good mechanical properties with an elongation at the break of 140%, and can be applied to the field of visualized flexible sensing, smart wearable devices and other fields. [ABSTRACT FROM AUTHOR]

Electro-driven liquid crystal elastomer (LCE) materials have broad application prospects in soft actuators, artificial muscles and micro-robots. Traditional electro-driven LCE materials are mostly prepared by doping conductive materials (carbon nanotubes, graphene, carbon black, etc.) into the polymer materials. In order to improve the conductivity, it is often necessary to increase the amount of conductive fillers, which leads to the poor mechanical properties and unsatisfactory actuation effect. To solve this problem, the liquid metal/liquid crystal elastomer (LM/LCE) composite film is prepared, then carbon black conductive filler is embedded between two LM/LCE films to obtain an electro-driven carbon black/liquid metal/liquid crystal elastomer (CB/LM/LCE) composite film with a "sandwich" structure. The composite materials are characterized and analyzed by Fourier infrared spectroscopy, differential scanning calorimetry, wide angle X-ray diffraction, scanning electron microscope, universal tensile testing instrument, etc. The results show that the LM/LCE film has excellent mechanical properties. After further embedding carbon black conductive filler between two LM/LCE films, the CB/LM/LCE composite film can perform a reversible electro-driven shrinking deformation with efficient electrothermal conversion effect. Powered by an 80 V direct current supply, the CB/LM/LCE composite film can perform a reversible shapdeformation and the surface temperature increases from 30 ℃ to 124 ℃ in 240 s. The shrinkage rate of the CB/LM/LCE composite film reaches 18% in 130 s and the deformation shrinkage increases rapidly in the next 70 s. At 200 s, the maximum shrinkage rate can reach 45%. With a load of 50 g mass, the CB/LM/LCE composite film can still perform a remarkable reversible deformation with a maximum shrinkage rate of 42%. [ABSTRACT FROM AUTHOR]

Polyvinylidene fluoride (PVDF) porous membrane was prepared by a two-step method of surface gel-immersion precipitation phase inversion. First, N,N-dimethyl diamide/ H2O (DMAc/H2O) solutions with different volume ratios were sprayed on the PVDF solution, leading to surface gelation of the solution membrane. Then, the solution films with the surface gel were immersed into the deionized water of the coagulation bath to form the porous membranes by the precipitation phase inversion. The influences of spraying different DMAC volume fractions in DMAc/H2O solutions (φ (DMAc)) on the structures and performances of PVDF porous membranes were investigated. Results showed that as φ (DMAc) increasing, the β crystal content on the upper surface of the membranes gradually decreased, and the α crystal content gradually increased, but the overall crystallinity of the membranes gradually increased. PVDF membranes average pore size and porosity increased firstly and then reduced with the increasing of φ (DMAc), and the membrane porosity greatly affected the water flux of the membrane. It was observed by scanning electron microscope (SEM) that the upper surface of the PVDF membranes sprayed with DMAc/H2O solution became a porous skin layer, and with an increment in the DMAc ratio, the spherical crystal grains on the upper surface gradually increased, and the cross sections of the membranes changed from a finger-like macroporous structure to a sponge-like pore structure. When φ (DMAc) was 0.3, the water flux and bovine serum albumin (BSA) rejection rate of the membrane reached the maximum. [ABSTRACT FROM AUTHOR]

Degradable magnetic and CO2 dual-responsive microgels were prepared by inverse suspension polymerization and in-situ synthesis of nanoparticles. The structure and morphology of microgels were characterized by Fourier-transformed infrared (FT-IR) spectroscopy, scanning electron microscope (SEM) and transmission electron microscope (TEM). The microgels exhibited magnetic and CO2 responsiveness, and could be degraded upon the treatment of D, L-dithiothreitol (DTT). After treating with the stimulus of CO2, the microgels exhibited a selective adsorption for anionic dyes. The maximum adsorption capacity was up to 1413 mg/g for Alizarin red (AR). The microgels with adsorbates could be separated from solutions under the help of an external magnetic field. Besides, the adsorbates could be described by treating with solution of pH 12. Microgels regenerated with CO2 trigger exhibited high adsorption ability (>90%) after three consecutive recycling trials. [ABSTRACT FROM AUTHOR]

Poly(L-lactide) (PLLA) and polybutyrolactam (PBL) are both biocompatible and biodegradable polymers. Here, bio-based and biodegradable fibers were electrospun from PLLA/PBL blend solutions dissolved in hexafluoroisopropanol (HFIP), the co-solvent of PLLA and PBL. The influences of PBL mass fraction on fiber properties including morphology, average diameter, thermal, crystallization and hydrophilicity properties were investigated by scanning electron microscope (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and contact angle testing. The internal structure of blend fibers was confirmed by transmission electron microscope (TEM). Dichloromethane (DCM), the solvent of PLLA was used to etch the fibers to give a supplementary proof. It was found that beads free homogeneous fibers without band structure could be obtained from PLLA/PBL blends. The diameters of fibers distributed in a range of 0.1~1.6 μm. The average diameters of PLLA/PBL blend fibers were lower than those of pure PLLA fibers and decreased with the increasing of PBL mass fraction. The crystallinity of PLLA in as-spun fibers was low, and it could be increased by cooling from 190 °C that above the melting point of PLLA or annealing at 110 °C above its glass transition temperature. Introducing PBL into PLLA fibers hindered the melt and annealed crystallization of PLLA. The reduction in the degree of PLLA crystal perfection was characterized by the obvious decrease in either PLLA crystallization temperature during cooling or the melting temperature in the second heating. The broadening of the half-peak width of PLLA crystal diffraction peaks was another evidence provided by XRD. All evidences from TEM observation and solvent etching experiment suggested that the fibers with core-sheath structures were obtained by single-nozzle electrospinning from solutions of PLLA/PBL blends. The phase separation occurred during the electrospinning process due to various segment mobility should be responsible for the fiber structure with PBL core and PLLA sheath. It could explain why the addition of hydrophilic PBL hardly improved the hydrophilicity of as-spun fiber surfaces. [ABSTRACT FROM AUTHOR]

A series of PAM-co-PDAAM-co-PNIPAM copolymers were synthesized by reversible addition fracture transfer (RAFT) polymerization from acrylamide (AM), diacetone acrylamide (DAAM) and N-isopropylacrylamide (NIPAM). Their structure and composition were characterized by Nuclear Magnetic Resonance (NMR) and Gel Permeation Chromatography (GPC). Hydrogel with pH and temperature dual-response formed by the acyl hydrazone dynamic bonds between ketocarbonyl in polymer and hydrazide in adipic dihydrazide (ADH). The dual-responsive behavior of hydrogels to temperature and pH was researched by rheological measurement, Scanning Electron Microscope (SEM) and Fourier Transform Infrared (FT-IR) spectroscopy. At the same time, the hydrogel demonstrated temperature controlled self-healing properties. Besides, the hydrogels showed pH-and temperature-responsive controlled release behaviors for doxorubicin(Dox). [ABSTRACT FROM AUTHOR]

Carbon fiber reinforced polytriazole matrix (CF/PTA) composites, a novel low temperature cured and high temperature resistant series, were developed originally by East China University of Science and Technology. In order to improve the interfacial bonding strength of CF/PTA composites, based on molecular structures of the resin matrix, the carbon fiber reinforcement and the sizing agents on carbon fiber surfaces, three N-base coupling reagents containing different functional groups such as azido, isocyanate and aziridine were designed and employed to treat the fiber surfaces. The chemical bonding mechanisms were researched in terms of the analyses from X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and atomic force microscope (AFM). The characterizations suggested that the N-base coupling reagents reacted with the resin matrix polytriazole (PTA) and the carbon fiber reinforcement respectively, and effective chemical bridges were established between PTA and carbon fiber by N-base coupling reagents. Significant improvement of the interlaminar shear strength (ILSS) were achieved when only 2% mass fraction of N-base coupling reagents were added to the composites. The most available process is carbon fiber treatment with isocyanate-containing coupling (A1), which improved the ILSS by about 70%; while the application of azido- or aziridinecontaining reagents were along with heating or concentrated nitric acid treatments, which increased the ILSS by 89% and 86%, respectively. [ABSTRACT FROM AUTHOR]

Using acrylamide (AM) as monomer, chitosan (CS) and graphene oxide (GO) as functional components, N, N'- methylene bisacrylamide (MBA) as crosslinking agent, a series of PAM/CS/GO composite hydrogels with three-dimensional network structure were prepared by free radical polymerization. The chemical composition, structure, morphology, and mechanical properties of the composite hydrogels were analyzed using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffractometer (XRD), scanning electron microscope (SEM), and universal testing machine. The experimental results show that GO is uniformly dispersed in the PAM/CS hydrogel matrix. Compared with PAM/CS hydrogels, PAM/CS/GO hydrogels have a tighter porous structure with an average pore diameter of about 55.7 μm. In addition, the mechanical properties of PAM/CS/GO hydrogels have been significantly improved, the largest elongation at break is 2 039%, and the maximum breaking stress reaches 237 kPa. This is due to the fact that GO acts as a physical crosslinking agent in the PAM/CS hydrogel to form good interface bonds. The hydrogel with cross-linked network structure and plenty of hydrophilic groups can be used as the sensing coating of the quartz crystal microbalance (QCM), and the QCM humidity sensor based on the functional hydrogel film is prepared. The moisture absorption behavior of composite hydrogel films was studied using QCM technology under different humidity conditions. As the air relative humidity (RH) increases from 33% to 85%, the frequency response of the composite hydrogel film modified QCM sensor increases from 12.2 Hz to 22.3 Hz. This research work provides valuable reference for the application of the hydrogel coating in the field of QCM humidity sensors. [ABSTRACT FROM AUTHOR]

Fluorinated benzoxazines with allyl (BOZF-1), phenyl acetylene (BOZF-2) and propargyl (BOZF-3) were synthesized and used to modify silicon-containing arylacetylene resin(PSA). The effects of the structure and the contents of BOZF on the properties of modified resin (BOZF/PSA) were investigated. The curing behavior of BOZF/PSA resins were studied by differential scanning calorimetry (DSC). The micro-morphology of the blend resin casting was analyzed by Scanning Electron Microscope (SEM). The thermal stability and thermal mechanical properties of the cured BOZF/PSA resin were analyzed by Thermogravimetric Analysis (TGA) and Dynamic Mechanical Analysis (DMA). The dielectric property was also studied. Results showed that the addition of BOZF resins could improve the toughness of PSA resin, and the bending properties of cured products improved with the increase of benzoxazine mass fraction. Among them, the bending strength of modified resin (w(BOZF-1)=30%) could reach 28.1 MPa, which was increased by 44.1% compared with PSA resin. The heat resistance of modified PSA resin decreased slightly with the addition of BOZF resin, the 5% mass loss temperature of the cured resin BOZF-1/PSA, BOZF-2/PSA and BOZF-3/PSA (w(BOZF) = 10%) was 544, 604 ℃ and 584 ℃ in nitrogen, and their residual rate at 1 000 ℃ was 84.4%, 89.0% and 88.1%, respectively. With the addition of BOZF, dielectric constant of modified resin was slightly increased, but still maintained a good dielectric performance. SEM showed that the smooth and flat cross-sections turned into tough ones with many cracks and ductile fracture zones, which proved that the modified resin changed from typical brittle fracture to ductile fracture. [ABSTRACT FROM AUTHOR]

In this study, rod like hydroxyapatite (HAp) with a length of 25 —35 nm and a width of 10 —20 nm was synthesized by chemical precipitation method. Then the HAp was doped in situ into the nano-disk osteogenic Laponite (LP) matrix. A type of injectable composite with high bioactivity was prepared by a single-step ultrasonic mixing method by leveraging Laponite’s good water solubility and in situ gelation property. The prepared gel material showed good injectability and thixotropic properties. A comparative study was conducted between pure LP injectable material (LIM) and LP/HAp injectable material (LHIM). The results of X-Ray Energy Spectrum showed that the HAp in the LHIM was well dispersed. The results of Scanning Electron Microscope (SEM) showed that the introduction of HAp increased the surface roughness of LHIM compared with LIM. The results of rabbit bone marrow mesenchymal stem cells (rBMSCs) in vitro showed that both LHIM and LIM had good cytocompatibility, and more rBMSCs adhered to the surface of LHIM in one day. The results of transwell showed that compared with LIM, LHIM could further improve the migration ability of rBMSCs. The results of osteogenic activity in vitro showed that LHIM can increase rBMSCs alkaline phosphatase (ALP), Runt-related transcription factor 2 (Runx2) and osteocalcin (OCN) activity. LHIM has the advantages of simple preparation, rapid gelation, no cross linking agent, easy storage and good osteogenic activity. Therefore, LHIM is expected to be a bone repair material for clinical use. The current study provides a potential therapeutic tool for bone repair and regeneration [ABSTRACT FROM AUTHOR]

The proanthocyanidin (PC)-enhanced polyethylene glycol (PEG)-lysozyme (LZM) hydrogel (PEG-LZM-PC) was prepared based on PEG-LZM hydrogel by post-soaking with PC. The morphology, structure and mechanical properties of PEG-LZM-PC were characterized by scanning electron microscope (SEM), Fourier-transformed infrared (FT-IR) spectroscopy and universal testing instruments. Antibacterial ability of PEG-ZEM-PC was evaluated by plate coating method. The effect of PEG-LZM-PC on the expression of inflammatory factors in immune cells was evaluated by quantitative reverse transcription PCR (RT-qPCR). The results showed that the strength and toughness of PEG-LZM-PC were significantly improved compared with PEG-LZM; the antibacterial performance of PEG-LZM-PC in vivo and in vitro was pretty good; and the inflammatory response caused by lipopolysaccharide (LPS) stimulation was inhibited by PEG-LZM-PC, which is expected to promote wound healing. [ABSTRACT FROM AUTHOR]

Cellulose/sodium alginate (Cellu/SA) composite aerogels were prepared via freeze-drying technique as a valid method to develop 3D scaffolds for tissue engineering. Cellulose with hydroxyl groups showed weak apatite nucleation ability in simulated body fluid(SBF). In order to induce the formation of apatite crystal, oxidation modification of Cellu/SA composite aerogels was carried out with sodium periodate and sodium chlorite. The hydroxyl groups at C2 and C3 of Cellulose and SA were oxidized into carboxyl groups, leading to improve mineralization ability. The morphology and structure were characterized by Fourier Transform Infrared (FT-IR) spectrometer, Scan Electron Microscope (SEM), X-Ray Diffraction (XRD) and X-ray photoelectron spectroscopy. Results show that the formation of HA on the surface of dicarboxylic Cellu/SA composite aerogels is faster with smaller grain size, and the deposition layer is more uniform after mineralization for 7 d. The Cellu/SA composite aerogels thus possess an ultrafine 3D nanoporous network structure. It is noticeable that the dicarboxylic Cellu/SA composite aerogel is a promising candidate for orthopedic biomaterial application with a Ca/P molar ratio of 1.35. In addition, the aerogel has good biocompatibility demonstrated by CCK8 assay and Live/Dead fluorescence staining of L929 cells. The L929 cells activity of both Cellu/SA and dicarboxylic Cellu/SA composite aerogels extracts are higher than 80%. When the culture duration is prolonged to 72 h, an obvious increase in the intensity of green fluorescence is observed, suggesting that the number of cells is increased. The biocompatible mineralized dicarboxylic Cellu/SA composite aerogels can promote cell growth and differentiation and are potential to be applied as a bone repair material. [ABSTRACT FROM AUTHOR]

Magnetic Fe3O4 nano-particles were prepared by chemical coprecipitation method, and magnetic chitosan microspheres (Fe3O4@CS) and polyethyleneimine (PEI) modified magnetic chitosan microspheres (Fe3O4@CS/PEI) with different proportions were thereby prepared by Schiff base reaction in the emulsion system using glutaraldehyde as the crosslinking agent. The structure, particle size and magnetism of microspheres were characterized by infrared spectroscopy (FT-IR), X-ray powder diffraction(XRD), scanning electron microscope (SEM), dynamic laser scatter (DLS) and hysteresis loop. The adsorption amount of ibuprofen on microspheres and reuse rate were studied by ultraviolet spectrophotometer. The characterization results showed that the microspheres were successfully prepared by Schiff base reaction, which had no effect on the crystal phase of Fe3O4. The microspheres presented regular circle with narrow size distribution and they were magnetic. The thermodynamics adsorption model of ibuprofen on microspheres was Langmuir adsorption isotherm, and the kinetic adsorption model was second order dynamics model. With the increase of PEI mass fraction, the adsorption amount of ibuprofen on microspheres were increased. When m(PEI)∶m(CS)=1∶1, the maximum adsorption amount of ibuprofen on CP-3 (Fe3O4@CS/PEI) was determined to be 138.63 mg/g by the Langmuir adsorption equation fitting, which was twice higher than that on CP-0(Fe3O4@CS). After repeating adsorption experiments for 5 times, the microspheres still showed good adsorption performance for ibuprofen. [ABSTRACT FROM AUTHOR]

A tough, porous silk fibroin (SF)/polyethylene glycol (PEG) cryogel was prepared through a simple freezethawing procedure by using PEG as cross-linking agent. Fourier-transform infrared (FT-IR) spectra, scanning electron microscope (SEM) and universal-testing machine were used to investigate the conformational change, micromorphology, mechanical properties, and swelling behaviors of cryogels. Results demonstrated that the incorporation of PEG faclitated the formation of crystal structures of SF chains, and the microstructure and mechanical properties can be tailored by freezing temperature, mass ratio of PEG to SF (mPEG/mSF), and SF mass fraction. When freezing temperature was −20 °C, wSF = 0.16, and mPEG/mSF = 0.50, the compressive modulus of the SF/PEG cyrogels was up to 0.44 MPa and can tolerant large compressive strain (90%) without permanent deformation and fracture. The cryogel also demonstrated excellent elasticity recovery during cyclic compression test, and the Young’s modulus and toughness of cryogels could reach up to 4.15 MPa and 680.81 kJ/m3, respectively. The cryogels with homogeneously distributed inter-connected porous structure would promote their potential applications in tissue engineering field. [ABSTRACT FROM AUTHOR]

Firstly, the copolymer poly[(N-isopropyl acrylamide)-co-(N-(2-hydroxyethyl)acrylamide)] (P(NIPAM-co- HEAA)) was obtained by reversible addition fragmentation chain transfer (RAFT) polymerization reaction at different feed ratio of NIPAM/HEAA. Then, the double bond functionalized copolymer poly[(N-isopropyl acrylamide)-co-(2- acrylamidoethyl acrylate)] (P(NIPAM-co-AAEA)) was obtained by coupling with acryloyl chloride. Finally, thermo-sensitive hydrogel coating was fabricated by ‘one step ’ photocrosslinking reaction of thermo-sensitive copolymer P(NIPAM-co- AAEA) and double bond functionalized antibacterial peptides (AMPs) on polydimethylsiloxane (PDMS). The thermosensitive copolymers were characterized by proton nuclear magnetic resonance (1H-NMR) to identify the ratio of polymeric monomers. The AMPs were identified by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS). Then, the modification of the hydrogel on the substrate and the morphology were characterized by fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM), respectively. The thermosensitivity of the hydrogel coatings were confirmed by static water contact angle (WCA) as a function of temperature variation. Finally, the antifouling and antibacterial properties of the hydrogel coating were validated by bacterial LIVE/DEAD viability assays characterized by Confocal Laser Scanning Microscope (CLSM) and colony counting assays. The results showed that when the feed ratio of NIPAM/HEAA was controlled at the optimized value of 87:13, the LCST of P(NIPAMco- AAEA) was determined as 36.6 °C, which was close to human body temperature 37 °C. It is expected that these copolymers would present a thermo responsiveness under body temperature. Meanwhile, the prepared thermo-sensitive hydrogel coating exhibited expeted antifouling property and antibacterial activity. [ABSTRACT FROM AUTHOR]

p-Chloroaniline modified carbon nanotube film(pca-CNT)was prepared by diazotization reaction of carbon nanotube(CNT)film.Poly(2,5-dihydroxy-1,4-benzoquinonyl sulfide)(PDBS)was grown uniformly on the the surface of pca-CNT by in situ polycondensation method.The obtained pca-CNT@PDBS composite was used as flexible electrode later.The morphology and structure of composite was characterized by field scanning electron microscope(FE-SEM),field transmission electron microscope(TEM),energy dispersive spectrum(EDS),Fourier infrared spectrum(FI-IR)and photoelectron spectroscopy(XPS).The results indicated that PDBS was coated on the pca-CNT film successfully.The electrochemical testing showed that the pca-CNT@PDBS flexible electrode exhibited an area specific capacitance(CA)of 108 mF/cm2 at the current density of 1 mA/cm2,higher than pure PDBS(65.6 mF/cm2)and CNT-supported PDBS(CNT@PDBS,83.2 mF/cm2).With the pca-CNT@PDBS and CNT@PDBS as flexible positive electrode respectively,CNT-supported poly(1,5-diamino-anthraquinone)(CNT@PDDA)as flexible negative electrode,and crylic rubber cross-linked memberane/tetraethyl tetrafluorate acetonitrile electrolyte(ACM/Et4 NBF4-AN)as the quasi-solid-state electrolyte,organic asymmetric supercapacitor were assembled at the same time.The electrochemical results showed that area specific capacitance of the as-assembled flexible organic asymmetric supercapacitor was 79.6 mF/cm2 at the current density of 2 mA/cm2 and its volumetric energy density was 1.63 mW·h/cm3 at the power density of 63.5 mW/cm3.The capacitance retention of CNT @ PDBS//ACM/Et4 NBF4-AN//CNT @ PDAA organic asymmetric supercapacitor was about 30.5% after only 7 500 cycles,exhibiting bad cycle performance.After 8 000 charging-discharging cycles,specific capacitance retention of pca-CNT @ PDBS//ACM/Et4 NBF4-AN//CNT@PDAA was 80.5%,presenting much better cycle performance. [ABSTRACT FROM AUTHOR]