作者:C. C. Unruh
DOI:10.1002/pol.1960.1204514604
日期:1960.8
The trans isomers of both poly(4′-vinylbenzalacetophenone) and a model compound, 4′-ethylbenzalacetophenone, readily form the corresponding cis isomers on exposure of their solutions to ultraviolet radiation. The cis isomers can be isolated and, in the case of the nonpolymeric material, the cis form reverts readily to the trans form upon addition of a trace of hydrogen chloride. The polymer, however
聚(4'-乙烯基苯扎基苯乙酮)和模型化合物 4'-乙基苯扎基苯乙酮的反式异构体在其溶液暴露于紫外线辐射时容易形成相应的顺式异构体。顺式异构体可以被分离出来,在非聚合材料的情况下,顺式异构体在加入微量氯化氢后很容易转变为反式异构体。然而,聚合物仅部分恢复为反式形式。对此提供了一种解释,即,即使在稀溶液中,卷曲聚合物中也会发生分子内二聚反应。聚合物链中的这些连接点阻止了完全转变为反式。