摘要
聚乙醇酸(PGA)降解速度过快导致其储存稳定性差、货架期短,通常需要高阻隔包装材料和低温储存以减小PGA的降解程度。本文主要系统地研究了不同包装材料、包装气氛和储存温度对PGA粒子性能的影响,研究的包装材料包括铝塑袋外层和低密度聚乙烯(PE-LD)及PE-LD/聚酰胺(PA)内层材料,包装气氛包括空气、氮气和真空,储存温度包括-16℃、5℃和25℃。包装储存一定时间后取样并检测了PGA的熔体流动速率、分子量及分子量分布和热学性能,研究了包装条件对PGA降解的影响。结果表明,随着储存温度的升高,PGA材料的熔体流动速率随时间变化明显升高,分子量也随之降低,包装气氛中的水份或包装材料的阻水性能都会影响PGA的降解及性能。
Polyglycolic acid(PGA)usually has a high degradation rate,which leads to poor storage stability and short shelf life.In this study,the effects of different packaging materials,atmospheres inside the packages,and storage tem-peratures on the properties of PGA pellets were systematically investigated.The packaging materials evaluated in this work included low density polyethylene(PE-LD)and PE-LD/polyamide internal packaging materials and aluminum/plastic composite external packaging material.Air,nitrogen,and vacuum were used as packaging atmospheres.The storage temperatures were set to be‒16,5,and 25℃.The melt flow rates,molecular weights and molecular weight dis-tributions,and thermal properties of PGA were assessed after different storage times,and the effect of packaging condi-tions on the degradation of PGA were analyzed.The results indicated that there was an increase in the melt flow rates of PGA with a variation of storage temperature along with a correspondingly decrease in its molecular weight.Both the moistures of the packaging atmospheres and the moisture barrier properties of the packaging materials influenced the deg-radation and properties of PGA.
作者
谢瑛鸾
周炳
王洪学
XIE Yingluan;ZHOU Bing;WANG James Hongxue(Sinopec Shanghai Research Institute of Petrochemical Technology Co,Ltd,Shanghai 201208,China)
出处
《中国塑料》
北大核心
2025年第4期20-24,共5页
China Plastics
关键词
生物可降解高分子
聚乙醇酸
降解
包装材料
包装条件
biodegradable polymer
polyglycolic acid
degradation
packaging material
packaging condition
