聚乙烯醇在阶段性热处理下的结构变化

发布时间：2018-06-29 10:21

  本文选题：聚乙烯醇 + 阶段性热处理　； 参考：《高分子材料科学与工程》2017年05期

【摘要】：聚乙烯醇(PVA)在热处理作用下会逐渐发生侧基脱除、断链、环化等复杂的副反应。通过阶段性热处理方法,可望在减少副反应的同时在分子主链上生成双键,从而得到类似聚乙炔的共轭聚合物。文中以PVA1799为原料,通过阶段性加热法,利用在线红外技术,研究了PVA在氮气气氛下不同温度热处理后的结构变化。热处理温度范围为30~330℃,在150℃,180℃,210℃,240℃,270℃,300℃和330℃每个温度点停留30 min。研究发现,PVA的熔点为210℃,在240℃开始发生结构变化,并在分子主链生成双键和羰基。当温度超过300℃,有少量二氧化碳(CO_2)放出,开始出现更为复杂的副反应。
[Abstract]:The side group removal, chain breaking and cyclization of polyvinyl alcohol (PVA) will occur gradually under heat treatment. By means of heat treatment, the conjugated polymers similar to polyacetylene can be obtained by forming double bonds at the same time of reducing side reactions. Using PVA1799 as raw material, the structure changes of PVA after heat treatment at different temperatures in nitrogen atmosphere were studied by means of stage heating and on-line infrared technique. The heat treatment temperature ranges from 30 鈩，

本文编号：2081803