Abstract: It was found that the photocrosslinking reaction of benzophenone-sensitized 3, 4-polyisoprene was an uncyclized process by means of IR, NMR and chemical analysis.
The measurement of GPC proved that the molecular weight distribution of benzophenone-sensitized 3, 4-polyisoprene which was irradiated by an 80 W high pressure Hg lamp was the same as unsensitized 3, 4-polyisoprene.
The conclusion therefore, is that the photocrosslinking reaction of this system was an uncyclized and undegraded process.