生物可降解聚己二酸-对苯二甲酸丁二醇酯纤维的制备及其环境降解性能

Preparation and environmental degradation behavior of biodegradable poly(butylene adipate-co-terephthalate)fiber

为研究生物可降解聚己二酸-对苯二甲酸丁二醇酯(PBAT)的可纺性及纤维降解性能,采用熔融纺丝-牵伸二步法制得生物可降解PBAT纤维,研究了纺丝温度、牵伸倍数对PBAT纤维结晶度、回潮率、力学性能的影响,对比分析了PBAT纤维在不同环境下的降解性能。结果表明:PBAT的最佳纺丝温度为260℃,且随着牵伸倍数的增加,PBAT纤维的断裂强度、结晶度和取向度呈快速上升趋势,而断裂伸长率呈下降趋势;低温、干燥的非生物环境因素对PBAT纤维的降解性能影响最小,在该环境中储存1个月纤维断裂强度仅下降3.6%;相较于酶解和水解生物环境条件下,土壤环境对PBAT纤维的影响更明显,可使纤维的结晶度从34.45%下降到19.36%。

In order to study the spinnability and fiber degradation of biodegradable poly(butylene adipate-co-terephthalate)(PBAT),biodegradable PBAT fiber was prepared using a two-step method involving melt spinning and drafting.The effects of spinning temperature and drafting ratio on the crystallinity,moisture regain and mechanical properties of PBAT fiber were studied,and the degradation properties of PBAT fiber in different environments were compared and analyzed.The results show that the optimum spinning temperature of PBAT was 260℃,and with the increase of drafting ratio,the breaking strength,crystallinity and orientation of PBAT fiber increased rapidly,while the elongation at break decreased.It was found that the abiotic cold and dry environments had the least influence on the properties of PBAT fibers,where the fiber strength decreased by only 3.6%after one month storage under such a circumstance.Under biological conditions,on the other hand,the influence of soil was more obvious compared to enzymatic hydrolysis and hydrolysis,where the crystallinity of PBAT fiber decreased from 34.45%to 19.36%.