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首页> 外文期刊>Journal of Applied Polymer Science >Blends of aliphatic polyesters. III. Biodegradation of solution-cast blends from poly(L-lactide) and poly(epsilon-caprolactone)
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Blends of aliphatic polyesters. III. Biodegradation of solution-cast blends from poly(L-lactide) and poly(epsilon-caprolactone)

机译：脂族聚酯的混合物。三，聚（L-丙交酯）和聚（ε-己内酯）溶液浇铸共混物的生物降解

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摘要

Phase-separated blend films were prepared with the solution casting method from poly(L-lactide) (PLLA) and poly(epsilon-caprolactone) (PCL) with different PLLA contents [X- PLLA (w/w) = PLLA/(PCL + PLLA)] and their biodegradation was investigated in soil up to 20 months by gravimetry, gel permeation chromatography, tensile testing, differential scanning calorimetry, and scanning electron microscopy. The nonblended PCL film and the blend film with X-PLLA = 0.25 disappeared in 4 and 12 months, respectively, while most of the initial mass remained for the blend film of X- PLLA = 0.75 and the nonblended PLLA film. The decrease in weight remaining, molecular weight, tensile strength, and elongation-at-break was higher for blend films of low X-PLLA. The melting temperature of PLLA in blend films of X-PLLA = 0.5 and 0.75, and of nonblended him, remained around 179 degrees C upon biodegradation in soil for 20 months. The preferred biodegradation of PCL in blend films resulted in formation of microspheres of a PLLA-rich phase at the surface for the blend film of X- PLLA = 0.25 and the porous structure for blend films of X- PLLA = 0.5 and 0.75. Comparison of the weight loss of blend films in biodegradation in soil with that of the nonenzymatic hydrolysis in phosphate-buffered solution revealed preferred enzymatic degradation of PCL and insignificant attack. to PLLA in the blends. (C) 1998 John Wiley & Sons, Inc. [References: 26]
机译：用溶液流延法从具有不同PLLA含量的聚（L-丙交酯）（PLLA）和聚（ε-己内酯）（PCL）制备相分离的共混膜[X- PLLA（w / w）= PLLA /（PCL） +重量法（PLLA）]及其在20个月以内的土壤中的生物降解情况，采用重量分析，凝胶渗透色谱，拉伸试验，差示扫描量热法和扫描电子显微镜进行了研究。未混合的PCL膜和X-PLLA = 0.25的共混膜分别在4和12个月内消失，而对于X-PLLA = 0.75的共混膜和未混合的PLLA膜，大部分初始质量仍然保留。对于低X-PLLA的共混膜，剩余重量，分子量，拉伸强度和断裂伸长率的降低更高。在土壤中生物降解20个月后，X-PLLA的共混膜中PLLA的融化温度（分别为0.5和0.75）和非共混物的融化温度保持在179℃左右。混合膜中PCL的优选生物降解导致在X-PLLA = 0.25的混合膜表面形成富含PLLA相的微球，而对于X- PLLA = 0.5和0.75的混合膜则形成多孔结构。比较在土壤中生物降解过程中共混膜的重量损失与磷酸盐缓冲溶液中非酶水解的重量损失，发现PCL具有较好的酶降解性，且攻击力微不足道。掺入PLLA中。 （C）1998 John Wiley＆Sons，Inc. [参考：26]

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