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This study focused on the effect of processing conditions on the tensile properties of continuous glass fiber-reinforced polyether ether ketone composites, fabricated by co-wrapped yarn method, under different conditions. Their tensile properties were investigated in terms of thermal and fracture characterizations. The cooling rate significantly affected only the tensile modulus. However, both holding temperature and holding time had a significant effect on the tensile strengths and modulus. Although the effects of both were the same, the optimal increase of the holding time was found to be more beneficial. [ABSTRACT FROM AUTHOR]

A series of novel amorphous poly(aryl ether ketone) random copolymers containing rigid bulky pendant adamantyl groups and different length symmetrical alkyl side chains were synthesized and characterized. The chemical structures of the copolymers were confirmed by Fourier transform infrared and proton nuclear magnetic resonance spectroscopies. The influence of different length of symmetrical alkyl side chains on the dielectric constant, thermal property, mechanical property, and water uptake was investigated. The result shows that the dielectric constants (κ) of the copolymer films (κ = 2.72–2.90 at 1 MHz) are remarkably lower than commercial poly(ether ether ketone) (κ = 3.27 at 1 MHz), and with the increasing length of symmetrical alkyl side chains of the copolymers, the dielectric constants of the copolymers decrease. The flexibility of the copolymer films exhibits a positive trend as the length of symmetrical alkyl side chains increases. Simultaneously, the copolymers maintain good solubility, low water uptakes, and excellent thermal and mechanical properties. [ABSTRACT FROM AUTHOR]

Two kinds of novel hybrid membranes with and without (3-aminopropyl)triethoxysilane (KH550) were produced using tetraethoxysilane dispersed in sulfonated poly(arylene ether sulfone) (SPAES) matrix by the sol–gel method. The obtained hybrid membranes (SPAES-K-SiO2 and SPAES–SiO2) possessed higher water uptake, proton conductivities and selectivity compared with the pristine SPAES membrane when the SiO2 content was 3 and 6 wt%, whereas the same properties of the obtained hybrid membranes decreased when the SiO2 content was 10 wt%. In addition, the acid–base interactions between SPAES and SiO2 could improve the dispersion of the inorganic particles (SiO2) in the SPAES matrix. As a result, SPAES–K–SiO2 hybrid membranes presented better methanol permeability and selectivity than SPAES–SiO2 hybrid membranes without the acid–base interactions. [ABSTRACT FROM PUBLISHER]

A new bisphenol monomer with pyridyl groups (compound 3) was synthesized via a two-step reaction. A series of functional poly(aryl ether ketone)s with pyridyl groups on the side chains (Py-PAEKs) were prepared by a nucleophilic substitution polycondensation of new bisphenol monomer, 2, 2-di(4-hydroxy phenyl)propane and easily available bisfluoro monomer at various molar ratios. Structures of compound 3 and Py-PAEKs were determined by means of 1H-NMR, IR spectra and elemental analysis. Thermal analysis of Py-PAEKs revealed that the glass transition temperature (Tg) and the 5% weight loss temperature (T5%) of these copolymers varied in the range of 147–176 °C and 432–330 °C, respectively, which showed strong chain rigidity and excellent thermal stability. Moreover, Py-PAEKs were soluble in some organic solvents under heating, which made them potentially used for self-assembly of rigid polymers. [ABSTRACT FROM PUBLISHER]