To investigate the possibility of double ring-opening polymerization behavior of 1,3-dioxolane derivatives, 2,7-diphenyl-1,3,6-trioxaspiro[4,5] dec-7-ene(ph-1,3,6 -TOSDE) was prepared from 2-phenyl-4-methylene-1,3-dioxolane by the reaction with phenyl vinyl ketone and its polymerization behavior was investigated. In the cationic polymerization of ph-1,3,6-TOSDE at various temperatures double ring-opened polymer was obtained in high conversion. Volume change during polymerization of ph-1,3,6-TOSDE was also investigated and compared with 7-phenyl-2-methyl-1,3,6-trioxaspiro[4, 5]dec-7-ene(Me-1,3,6-TOSDE). Ph-1,3,6 - TOSDE showed 6% of volume expansion and me-1,3,6-TOSDE showed 6.7%.
