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Clove essential oil is a natural and highly effective bacteriostatic agent, but its poor water solubility limits its wide application. Tn this study，palmitic acid (PA) was used as the hydrophobic group and N-acetyl-L cysteine (NAC) was used as the hydrophilic group to synthesize amphiphilic chitosan derivatives (PA-CSNAC), and further prepared clove essential oil-amphiphilic chitosan drug-loaded nanomicelles (NMs). Fourier infrared spectroscopy and nuclear magnetic resonance hydrogen spectroscopy showed that both PA and NAC were successfully grafted onto chitosan. Scanning electron microscopy results showed that the morphology of NMs showed a uniformly dispersed spherical shape. The research results have shown that clove essential oil-amphiphilic chitosan-loaded nanomicelles had pH-responsive performance at room temperature, and their antibacterial properties against Botrytis Cinerea increased by more than 10% compared with unembedded clove essential oil，where the performance of bacteria was improved significantly. [ABSTRACT FROM AUTHOR]

The low protein natural latex （LPNRL） was prepared by removing the protein from natural rubber latex （NRL） with the assistance of urea to weaken the hydrogen bond of protein in natural latex and loosen its structure. The results show that the stability of low ammonia or high ammonia LPNRL is significantly improved, when the amount of lipase is increased from 0.04% to 0.1%,when the amount of phospholipid is 0.8%.It means that the phospholipid hydrolysates can improve the mechanical stability of LPNRL. This study can provide a new method for the preservation of LPNRL. [ABSTRACT FROM AUTHOR]

Taking thermoplastic dialdehyde starch as the matrix, pineapple leaf fiber as the reinforcing material, the pineapple leaf fiber/thermoplastic starch composite was prepared by hot pressing. The effects of the fillings of pineapple leaf fiber on the mechanical, physicochemical and degradation properties of the composite were studied. The results show that when the fillings of pineapple leaf fiber is 15%, the tensile properties of the composite is the best, and the tensile strength and elongation at break are 7.4 MPa and 1.25%. The flexural strength and flexural modulus were 13.18 MPa and 2 245.54 MPa respectively when the fillings of pineapple leaf fiber was 20%.With the increase of fiber filling, the density of composite gradually decreases, moisture content and degradation rate of the composite gradually increased. [ABSTRACT FROM AUTHOR]

As a type of biodegrada polyvinyl alcohol (PVA) film, its environmentally friendly characteristic has been widely recognized around the world. However, its poor water resistance largely limits the popularization and application, due to a large number of hydrophilic groups in PVA molecules. In this work, glutaraldehyde and urea were used to react with PVA by acetal reaction, and then the plasticizers (glycerol, PEG-400, MgCl2) were added to the system to destroy the hydrogen bonding of PVA and reduce its crystallinity, in order to achieve the plastic modification effect. Finally, the structure of the products and the performance of the cured films were characterized by Fourier transform infrared spectrometer (FT-IR), thermogravimetric (TG) analysis, physical and mechanical properties, and contact angle. The results showed that the water resistance and thermal stability of PVA films could be enhanced by the crosslinking reaction of PVA with glutaraldehyde and urea. The addition of glycerol, PEG-400 and MgCl2 could improve the elongation at break and tensile strength of PVA films. And when the additive amount of glutaraldehyde, urea, glycerol, PEG-400 and MgCl2 in the formula were 4%, 0.5%, 6% and 2%, respectively, the mechanical properties of the film were optimal with the elongation at break of 136.7% and the tensile strength of 3.48 MPa. [ABSTRACT FROM AUTHOR]

In this paper, methyl eleostearate was prepared via the transesterification reaction betweent ung oil and methanol, and then was used to synthesize methyl eleostearate-maleic anh ydride CME-MA) adduct by D-A reaction under UV light. The structure of ME-MA was also identified and characterized by FTIR spectra, UVvis spectra and 1H NMR. Finally, ME-MA adduct was applied to the polyurethane coatings to study the effect of photoinitiator, reactive diluent and ME-MA adduct on the cured films. The experimental results concluded that the optimum formula conditions were as follows: the photoinitiator was TPO, the reactive diluent was HDDA, the amount of TPO was 5% and the addition amount of ME-MA was 20%. The cured film formation possessed good performance, including the highest gel fraction of 96.5%, tensile strength of 11.3 MPa and elongation at break of 23.2%. [ABSTRACT FROM AUTHOR]

Tung oil, as an important strategic biomaterial and renewable biomass resource, has attracted increasing attention due to its high value of research and application. In this study, eleostearic acid glyceride (the main component of tung oil) was transformed to methyl eleostearate (ME) by transesterification, and then reacted with catechol (CAT) via Friedel-Crafts alkylation using SO3 H-functionalized ionic liquid as catalyst. The alkylation products (CAT-ME) similar to urushiol (urushiol analogues) were successfully synthesized, and confirmed by the characterization results of infrared spectroscopy, UV visible spectroscopy, NMR spectra and IIPLC-MS spectra. [ABSTRACT FROM AUTHOR]