摘要
研究了聚乙烯醇(PVA)热氧环境下发生的老化反应,以及磷酸酯类和酚类复合稳定剂对 PVA 热稳定性能的影响。傅里叶红外光谱、X 射线光电子能谱分析结果表明:受热后 PVA 分子链上的羟基在高温下发生了消除反应,分子链上生成了 C=C 共轭双键。HAAKE 塑化仪、黄度指数及力学性能研究表明:复合热稳定剂的加入可以有效抑制 PVA 在加工过程中产生的共轭双键;减缓体系在热塑化过程中扭矩的上升速率;减少 PVA 热加工过程中黄度增加速率;同时使 PVA 力学性能得到改善。
The aging of PVA while heating in the presence of oxygen was investigated. The conjugated double bounds were observed by FTIR and XPS, which confirmed the elimination reaction of hydroxyl groups from poly （vinyl alcohol） at high temperature. By introduction of composite stabilizers of phosphates and phenols into PVA, the elimination of hydroxyl groups was effectively inhibited, which was evidenced by the decrease torque of PVA melt and yellow index.
出处
《中国塑料》
CAS
CSCD
北大核心
2008年第9期74-77,共4页
China Plastics
关键词
聚乙烯醇
热氧老化
复合热稳定剂
poly（vinyl alcohol）
thermal oxidative aging
composite stabilizer
