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

Abstract

Abstract: Dynamic rheological properties of poly(methyl vinyl)siloxane(PMVS) filled with ultratra silica (SiO₂) 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% SiO₂ 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 SiO₂ approached 20%. We owe this phenomenon partly to the surface esterification of silanols and partly to the unvulcanized PMVS.

Key words: Ultrafine silica, Poly(methyl vinyl)siloxane, Dynamic rheological properties

CLC Number:

O631

TrendMD:

HU Hong-Guo, ZHENG Qiang, TAO Xiao-Le . Dynamic Rheological Properties of Poly(methyl vinyl)siloxane Filled with Untrafine Porous Silica[J]. Chem. J. Chinese Universities, 2004, 25(5): 985.

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

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