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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
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
