Abstract

The polymerization of 4-phenyl-2-propenylidene-1,3-dioxolane with various cationic initiators is investigated. It is found that polymerization with BF 3 , trifluoromethanesulfonic acid or SnCl 4 as an initiator gives a polymer with almost complete 3,4-polymerization structure containing the 3,7-polymerization structure as an irregular structure. The polymerization with I 2 or AlCl 3 completely proceeds through the 1,7-polymerization to yield an insaturated polyester with a trans structure

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