壳聚糖/聚羟基丁酸戊酸共聚酯生物降解复合膜的制备

以冰乙酸为溶剂，将壳聚糖（CS）与聚3-羟基丁酸-co-3-羟基戊酸共聚酯（PHBV）采用共混流延法制备成CS/PHBV生物降解复合膜。采用扫描电镜、傅里叶变换红外光谱对复合膜进行了表征，并研究了不同质量比CS/PHBV复合膜的力学性能、透氧性能、热稳定性以及生物降解性能。结果表明：随着壳聚糖含量的增加，复合膜断面密实，蜂窝状结构消失，复合膜中羟基和酯基增多；当m_CS∶m_PHBV为3∶1时，CS/PHBV生物降解复合膜的拉伸强度与弹性模量达到最大值，分别为3.57和26.84 MPa；当m_CS∶m_PHBV为4∶1时，复合膜的透氧系数最小，为27.7×10^-15 cm³·cm/（cm²·s·Pa）；同时，壳聚糖的加入，提高了CS/PHBV复合膜的生物降解性。

Preparation of Chitosan/Poly(hydroxybutyrate-hydroxyhexanoate) Biodegradable Composite Films

Using acetic acid as solvent, chitosan(CS)/poly(3-hydroxybutyrate-co-3-hydroxyhexanoate)(PHBV) biodegradable composite films were prepared by tape casting.Scanning electron microscopy and Fourier-transform infrared were used to characterize the composite films, and the influences of different CS/PHBV mass ratio on the mechanical properties, oxygen permeability, thermal stability and biodegradation of composite films were studied. Results showed that with the increase of CS, the fractured surface of the composite films was more compact, the honeycomb structure disappeared, the number of hydroxyl and ester groups in the composite films increased. The tensile strength and elastic modulus of CS/PHBV biodegradable composite films reached the maximum when the m_CS:m_PHBV was 3:1, which were 3.57 and 26.84 MPa, respectively. The oxygen permeability was the smallest when m_CS:m_PHBV was 4:1, which was 27.7×10^-15 cm³·cm/(cm²·s·Pa). Meanwhile, due to the addition of chitosan, it was also found that the biodegradation of CS/PHBV composite films had been improved.