摘要
选取4种典型生物降解聚酯,聚乳酸(PLA)、聚(对苯二甲酸丁二醇酯-co-己二酸丁二醇酯)(PBAT)、聚丁二酸丁二醇酯(PBS)和聚己内酯(PCL),通过它们在天然海水中364 d内失重、分子量、力学性能、样条形貌的变化,考察了材料在海水中的降解性能。进一步通过对材料在天然海水、静态海水、静态河水、蒸馏水、除菌海水、自制海水这6种水体中降解性能的对比,研究了环境因素对聚酯在不同水体中降解性能的影响。研究表明生物降解聚酯在天然海水中的降解性能相对于在堆肥中的降解性能明显降低。在6种不同水体中,PLA基本不降解;PBAT、PBS在364 d内失重不超过3%;PCL降解最快,失重率为32%。微生物是影响生物降解速率的关键因素,高浓度无机盐对非酶促水解过程有一定促进作用。
With the increasing pollution of marine plastic,the degradation properties of biodegradable plastic in seawater have attracted much attention and controversy.Four typical biodegradable polyesters polylactide(PLA),poly(butylene adipate-co-terephthalate)(PBAT),polybutylene succinate(PBS)and poly(ε-caprolactone)(PCL),were selected.The degradability of these materials in seawater was studied by investigation of the change of their mass loss,molecular weight,mechanical properties,and spline morphology after being immersed in natural seawater for 364 d.Further,the effects of environmental factors on the degradation properties of four polyesters were studied in natural water,static seawater,static river water,distilled water,sterilized seawater,and lab-prepared seawater.Results show that the degradability of biodegradable polyester in natural seawater is significantly lower than that in compost.The most market-demand PLA almost exhibits no degradation after 364 d.The mass losses of PBAT and PBS are no more than 3%after 364 d.PCL degradation is the fastest and the mass loss of PCL degradation is 32%.Microorganisms seem to be the key factors affecting the rate of biodegradation.It is also found that the high concentration of inorganic salt has a promotion to the non-enzymatic hydrolysis process.
作者
王格侠
黄丹
张维
季君晖
WANG Gexia;HUANG Dan;ZHANG Wei;JI Junhui(National Engineering Research Center of Engineering Plastics,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China)
出处
《功能高分子学报》
CAS
CSCD
北大核心
2020年第5期492-499,共8页
Journal of Functional Polymers
基金
国家自然科学基金(51973228,51603212)
中国科学院青年创新促进会(2018033)。
关键词
海洋塑料污染
生物降解
海水降解
脂肪族聚酯
marine plastic pollution
biodegradation
seawater degradation
aliphatic polyester
