摘要
化学分析法及碳核磁共振研究表明 ,作为不饱和醛的α 丁烯醛 (巴豆醛 )与聚乙烯醇在水溶液中进行缩醛化时存在着 1,2 加成与 1,4 加成两种反应方式 .此机理不同于只有 1,2 加成方式的聚乙烯醇缩饱和醛化反应 .1,4 加成主要导致聚乙烯醇缩丁烯醛的交联 .
Chemical experiments and carbon nuclear magnetic resonance studies showed that there were two addition manners, 1,2-and 1,4-additions when alpha -butenal ( crotonaldehyde), as an unsaturated aldehyde, conducted an acetalization reaction with polyvinyl alcohol. This mechanism is different from that for the acetalization reaction of polyvinyl alcohol with saturated aldehydes, which has only I,2-addition. Crosslinking in polyvinyl butenal was mainly resulted from the 1,4-addition. Methods for calculating the acetalization degree and the ratio of 1,2- and 1, 4-additions according to the results of chemical analysis have also been suggested.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2001年第4期466-470,共5页
Acta Polymerica Sinica
基金
国家自然科学基金 (基金号 2 9764 0 0 1)
广西科委匹配资金资助
