以5种单官能缩水甘油醚——腰果酚缩水甘油醚(NC -513)、烯丙基缩水甘油醚(AGE)、苄基缩水甘油醚(692)、正丁基缩水甘油醚(660)及甲基丙烯酸缩水甘油酯(GMA)和侧链氨基聚硅氧烷为原料,通过环氧基与氨基的反应对侧链氨基聚硅氧烷进行改性.研究了不同反应条件下,改性聚硅氧烷的凝胶行为,表征了改性聚硅氧烷的结构.结果表明,NC -513与侧链氨基聚硅氧烷的反应活性最大:且室温以上时,改性聚硅氧烷凝胶的形成不受反应溶剂及原料反应官能团量之比的影响,所形成的凝胶为氢键物理交联；当温度升高时,会伴有羟基缩合的化学交联,烯键不与氨基反应.由于GMA中烯键和环氧基均与氨基反应,故形成化学交联凝胶.AGE、692、660改性聚硅氧烷在有溶剂的体系形成凝胶,在无溶剂情况下不形成凝胶.%The side chain modifiedpolysiloxane was obtained by epoxy ring-opening reaction with active hydrogen of amino through a mono-functional epoxy glycidyl ether and an amino side-chain polysiloxane. The structure of the modified polysiloxane was characterized at different reaction conditions. The results showed that NC -513 had the highest reactivity with amino side-chain polysiloxane, and the formation of the gel polymer was not affected by the reaction solvent and the ratio of the raw materials above the room temperature. The formation of the NC -513 modified polysiloxane was due to the physical cross-linking via hydrogen bonding. With increasing the temperature, the chemical crosslinking due to the hydroxyl condensation was accompanied with ethylenic bond and epoxide reaction, but the ethylenic bond did not react with the amino. The formation of the gel polymer from the GMA modified polysiloxane was due to the chemical cross-linking because both the ethylenic bond and the epoxy reacted with the amino. The AGE, 692, 660 modified polysiloxane formed gel in the presence of a solvent, but no gel was produced in the absence of a solvent.
展开▼
