Abstract
It was found that 3-vinylcyclopentene (VP), one of unconjugated diolefins, could be polymerized wih, anionic catalysts such as sodium naphthalene after some induction periods. The products formed during the induction period and the structure of polymer obtained from VP were investigated. In addition, the equimolar reaction of VP with sodium in hexamethylphosphoramide was carried out, and 3-ethylidenecyclopentene (EP) isolated from the reaction product was polymerized. From these results, it was suggested that VP was first isomerized to EP and then EP was polymerized to yield polymer. VP was polymerized atso with Ziegler catalyst, but th e structure of the polymer obtained varied with molar ratio of AlEt3 and TiCl4 charged.
3-Vinylcyclohexene was also isomerized to 3-ethylidenecyclohexene under anionic polymerization conditions but insoluble polymer in methanol was not prepared.
