Preparation and characterization of biodegradable poly(L-lactide)/chitosan blends
Preparation and characterization of biodegradable poly(L-lactide)/chitosan blends
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DOI：
10.1016/j.eurpolymj.2004.12.002
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发表时间：
2005-05-01
影响因子：
6
通讯作者：
Cheung, MK
中科院分区：
文献类型：
--
作者：
Chen, C;Dong, L;Cheung, MK
为了改善壳聚糖的性能，获得可完全生物降解的新型材料，采用丙酮沉淀法将聚L-乳酸（PLLA）与壳聚糖共混，制备了不同组成的PLLA/壳聚糖共混物。采用傅里叶变换红外光谱（IR）、X射线光电子能谱（XPS）、差示扫描量热法（DSC）、C-13固体核磁共振（NMR）和广角X射线衍射（WAXD）对共混物进行了表征。FTIR和XPS结果表明，共混物中两组分间存在分子间氢键，氢键主要存在于PLLA的羰基和壳聚糖的氨基之间。随着壳聚糖含量的增加，PLLA组分的熔融温度、冷结晶温度和结晶度降低。壳聚糖与PLLA的共混抑制了PLLA组分的结晶。WAXD结果表明，虽然PLLA组分的晶体结构没有发生变化，但由于两组分之间存在氢键，影响了共混物的结晶。(c)2005爱思唯尔有限公司保留所有权利。
In order to improve the properties of chitosan and obtain new fully biodegradable materials, blends of poly(L-lactide) (PLLA) and chitosan with different compositions were prepared by precipitating out PLLA/chitosan from acetic acid-DMSO mixtures with acetone. The blends were characterized by Fourier transform infrared analysis (MR), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), C-13 solid-state NMR and Wide-angle Xray diffraction (WAXD). FTIR and XPS results showed that intermolecular hydrogen bonds existed between two components in the blends, and the hydrogen bonds were mainly between carbonyls of PLLA and amino groups of chitosan. The melting temperatures, cold crystallization temperatures and crystallinity of the PLLA component decreased with the increase in chitosan content. Blending chitosan with PLLA suppressed the crystallization of the PLLA component. Although the crystal structure of PLLA component was not changed, the crystallization of the blends was affected because of the existence of hydrogen bonds between two components, which was proved by WAXD results. (c) 2005 Elsevier Ltd. All rights reserved.