摘要
通过降解过程的质量损失率、相对分子质量及其分布、热性能、表面形貌等评价手段,重点考察了Aspergillus niger脂肪酶对聚丁二酸乙二醇酯(PES)和聚(丁二酸乙二醇-共-对苯二甲酸乙二醇酯)(PEST)的降解性能。结果表明:PES在脂肪酶溶液中具有较好的生物降解性能,随着对苯二甲酸摩尔含量的增加,PEST的质量损失率呈现先增加后逐渐减少的趋势;随着酶解时间的延长,残留部分的PES、PEST的相对分子质量均呈下降趋势;残留部分的PES、PEST的熔点随降解时间的延长变化不大,熔融热焓有所增加;聚酯薄膜表面产生了不同程度的沟槽、孔洞和裂纹。可以推测,PES及PEST的生物降解首先发生在无定形区,并且大分子链段发生的是随机断裂。
The effect of Aspergillus niger lipase （Anl） on degradation performance of poly（ethylene succinate）（PES） and poly（ethylene succinate-co-ethylene terephthalate）（PEST） was investigated from the point of view of weight loss rate, molecular weight change, thermal properties, surface morphology after enzymolysis treatment. Results showed that PES had a good biodegradability in the presence of Anl. With the increase of phthalate content from 0 to 10 %, weight loss rate of PEST showed an increasing trend firstly, and then a decreasing after phthalate content up to 30 %. The molecular weight of residual PES and PEST decreased, but their melting enthalpy increased with the prolongation of hydrolysis time. SEM images of polyester films showed that several trenches, holes and cracks could be observed on the surface of films after being treated enzymolysisly. It can be suggested that the biodegradation of PES and PEST oc- cured firstly in amorphous zones, and macromolecular chain was degraded by a random chain scission.
出处
《合成纤维》
CAS
2014年第2期1-4,共4页
Synthetic Fiber in China
基金
国家国际科技合作专项项目(2011DFB51570)
关键词
聚丁二酸乙二醇酯
共聚酯
生物降解
质量损失率
poly（ethylene succinate）, copolyester, biodegradability, weight loss rate
