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Preparation and Characteristics of Liquid Silicone Rubber Using Polyorganosiloxane Modified with Dimethylacrylamide  

강두환 (고차구조형 유기산업재료 연구센터 및 단국대학교 고분자공학과)
이병철 (고차구조형 유기산업재료 연구센터 및 단국대학교 고분자공학과)
Publication Information
Polymer(Korea) / v.28, no.2, 2004 , pp. 143-148 More about this Journal
Abstract
${\alpha}$,$\omega$-Hydrogen polyorganosiloxane(HPMDMS) prepolymer was prepared from equilibrium polymerization ofoctamethylcyclotetrasiloxane, 1,3,5-trimethylcyclotrisiloxane, 1,3,5,7-tetravinyl-1,3,5,7-tetramethyl-cyclotetrasiloxane, and 1,1,3,3-tetramethyl disiloxane as an end-blocker in the presence of tetramethylammonium siloxanolate as a catalyst. Polyorganosiloxane modified with dimethylacrylamide(APMDMS) was prepared by hydrosilylation of HPMDMS with dimethylacrylamide in the presence of Pt catalyst, and followed by coordination of metal oxide (APMDMS-MO), such as NiO and FeO, to the amide moieties of the resulting polymer. The chemical structures of HPMDMS and APMDMS were confirmed by FT-IR and $^1$H-NMR analysis. Liquid silicone rubber containing metal oxide composite (LSRMO) was prepared by compounding APMDMS-MO, ${\alpha}$,$\omega$-vinylpolydimethylsiloxane, and a catalyst in a high speed dissolver. The thermal conductivity of LSRMO composite was determined to be 0.29 W/mK, and the volume resistivity exhibited a lower value than that of LSR composite. The mechanical and thermal properties of LSRMO and LSR composite were measured by UTM and TGA.
Keywords
hydrosilylation; equilibrium polymerization; ${\alpha}$,$\omega$-hydrogen polyorganosiloxane;
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