Allyldimethylsilyloxy-POSS®PSS-Allyldimethylsilyoxy-Heptacyclopentyl substituted烯丙基二甲基硅氧基-POSS®PSS-烯丙基二甲基硅氧基庚环戊烷取代基1-(烯丙基二甲基硅氧基)-3,5,7,9,11,13,15-七环戊基五环[9.5.1.13,9.15,15.17,13]八硅氧烷1-(Allyldimethylsilyloxy)-3,5,7,9,11,13,15-heptacyclopentylpentacyclo[9.5.1.13,9.15,15.17,13]octasiloxane