| Preparation of polystyrene/silica nanocomposites by radical copolymerization of styrene with silica macromonomer |
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| 作者单位： | OU BaoLi（College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China） ;
LI DuXin（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China） ; |
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| 摘 要： | A two-stage process has been developed to generate the silica-based macromonomer through surface-modification of silica with polymerizable vinyl groups. The silica surfaces were treated with excess 2,4-toluene diisocynate (TDI), after which the residual isocyanate groups were converted into polymerizable vinyl groups by reaction with hydroxypropylacrylate (HPA). Thus, polystyrene/silica nanocomposites were prepared by conventional radical copolymerization of styrene with silica macromonomer. The main effecting factors, such as ratios of styrene to the macromonomer, together with polymerization time on the copolymerization were studied in detail. FTIR, DSC and TGA were utilized to characterize the nanocomposites. Experimental results revealed that the silica nanoparticles act as cross-linking points in the polystytene/silica nanocomposites, and the glass transition temperatures of the nanocomposites are higher than that of the corresponding pure polystyrene. The glass transition temperatures of nanocomposites increased with the increasing of silica contents, which were further ascertained by DSC.
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| 收稿时间： | 7 April 2006 |
| 修稿时间： | 9 September 2006 |
Preparation of polystyrene/silica nanocomposites by radical copolymerization of styrene with silica macromonomer |
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| Authors: | Ou BaoLi Li DuXin |
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| Institution: | 1. College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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| Abstract: | A two-stage process has been developed to generate the silica-based macromonomer through surface-modification of silica with polymerizable vinyl groups. The silica surfaces were treated with excess 2,4-toluene diisocynate (TDI), after which the residual isocyanate groups were converted into polymerizable vinyl groups by reaction with hydroxypropylacrylate (HPA). Thus, polystyrene/silica nanocomposites were prepared by conventional radical copolymerization of styrene with silica macromonomer. The main effecting factors, such as ratios of styrene to the macromonomer, together with polymerization time on the copolymerization were studied in detail. FTIR, DSC and TGA were utilized to characterize the nanocomposites. Experimental results revealed that the silica nanoparticles act as cross-linking points in the polystytene/silica nanocomposites, and the glass transition temperatures of the nanocomposites are higher than that of the corresponding pure polystyrene. The glass transition temperatures of nanocomposites increased with the increasing of silica contents, which were further ascertained by DSC. |
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| Keywords: | silica nanoparticles surface modification styrene radical copolymerization nanocomposites |
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