光、氧化、生物、潮湿多重降解聚乙烯的研究

The Multiple Degradation of Low-density Polyethylene by Light,Oxidation,Biological and Wet

先确定氧化降解剂维生素C、潮湿降解剂聚乙二醇1000、光降解剂硬脂酸锰的最佳用量,再加入生物降解剂交联淀粉,从四个方面多重降解低密度聚乙烯,并利用热氧老化箱、紫外老化箱、盐雾试验箱模拟降解环境,老化后对薄膜进行红外光谱分析,结晶度表征和摩尔质量测定。结果表明,4种试剂分别发挥了各自的降解作用,其中光和氧化降解剂协同降解效果较好,生物和潮湿降解剂协同降解效果较好;当加入0.4%的硬脂酸锰,1%的维生素C,8%的淀粉,1%的聚乙二醇1000时,老化后羰基峰产生且面积不断增加,结晶度提高40.2%,摩尔质量下降98.13%,薄膜降解效果最好。

In this paper, the optimal agent polyethylene glycol 1000 and light d contents of oxidative degradation agent vitamin C, wet degradation egradation agent manganese stearate were determined firstly, then biodegradable agent crosslinked starch were added to study the multiple degradation of low-density polyethylene from four aspects. The environment of degradation was simulated by thermal aging tank, ultraviolet aging test machine and salt spray chamber. After the film was aged, it was analysed by infrared spectrum, its crystallinity degree was characterized and its molecular weight was measured. The results showed that each of the four reagents had taken effect on the degradation. Moreover, oxidative and light degradation agents were cooperated preferably, and biological and wet degradation agents were cooperated preferably. For the film with 0. 4% manganese stearate, 1% vitamin C, 8% starch and 1% polyethylene glycol 1000, after aging, the carbonyl peak appeared and its area grew constantly, the crystallinity degree increased by 40. 2% , the molecular weight was decreased by 98.13% , and the degradation effect of the film was the best.