超细SiO_2填充聚甲基乙烯基硅氧烷的动态流变特性  

Dynamic Rheological Properties of Poly(methyl vinyl)siloxane Filled with Untrafine Porous Silica

作　　者：胡洪国[1] 郑强[1] 陶小乐[2] 

机构地区：[1]浙江大学高分子科学与工程学系,杭州310027 [2]杭州之江有机硅有限公司研究发展中心,杭州311200

出　　处：《高等学校化学学报》2004年第5期985-987,共3页Chemical Journal of Chinese Universities

基　　金：国家杰出青年基金 (批准号 :5 0 12 5 3 12 );国家自然科学基金重点项目(批准号 :5 0 13 3 0 2 0 )资助

摘　　要：Dynamic rheological properties of poly(methyl vinyl)siloxane(PMVS) filled with ultratra silica (SiO 2) were analyzed on an advanced rheometric expansion system(ARES) at 25 ℃ by varying the strain (γ) and the frequency (ω). The results show that an incorporation of 5% SiO 2 into PMVS at 25 ℃ could be enough to impact a significant increase on the storage modulus (G′) of the uncured system, which is believed to be caused by the strong interactions among silica fillers. Meanwhile, γ dependence of G′ related to Payne effect was observed upon increasing γ amplitude, and no distinct “second plateau” was observed even the content of SiO 2 approached 20%. We owe this phenomenon partly to the surface esterification of silanols and partly to the unvulcanized PMVS.Dynamic rheological properties of poly(methyl vinyl)siloxane(PMVS) filled with ultratra silica (SiO 2) were analyzed on an advanced rheometric expansion system(ARES) at 25 ℃ by varying the strain (γ) and the frequency (ω). The results show that an incorporation of 5% SiO 2 into PMVS at 25 ℃ could be enough to impact a significant increase on the storage modulus (G′) of the uncured system, which is believed to be caused by the strong interactions among silica fillers. Meanwhile, γ dependence of G′ related to Payne effect was observed upon increasing γ amplitude, and no distinct “second plateau” was observed even the content of SiO 2 approached 20%. We owe this phenomenon partly to the surface esterification of silanols and partly to the unvulcanized PMVS.

关 键 词：超细二氧化硅 聚甲基乙烯基硅氧烷 动态流变特性 动态粘弹性 

分 类 号：O634.41[理学—高分子化学]