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Synthesis and polymerization kinetics of styrene-ethyl acrylate-vinyltrimethoxysilane copolymers
ZHAO HongChi;GAO LingLing;Qiao Bing;GAO JunGang
Journal of Beijing University of Chemical Technology ›› 2009, Vol. 36 ›› Issue (4) : 75-79.
PDF(906 KB)
PDF(906 KB)
Synthesis and polymerization kinetics of styrene-ethyl acrylate-vinyltrimethoxysilane copolymers
Copolymers of styrene (St), ethyl acrylate (EA) and vinyltrimethoxylsilane (VTMS) have been synthesized by emulsion copolymerization using sodium dodecyl sulfate and polyoxyethylene octylphenol ether as emulsifiers in order to modify the thermal properties of the St-EA copolymers. The effects of varying the concentrations of emulsifier, initiator, and organosiloxane as well as the polymerization temperature on the polymerization conversion and rate were investigated in detail. The copolymer was characterized by infrared spectrometry (IR) and thermogravimetric analysis (TGA). Copolymerization of VTMS with St-EA was confirmed by the appearance of an absorption peak at 1096cm-1 (due to Si—O—Si bonds) in the IR spectrum. The siloxane moieties in the copolymer chain underwent hydrolysis and self-condensation, resulting in a change in the structure of the copolymers from linear into a cross-linked network. As a result, the thermal stability of the copolymers was enhanced. The polymerization rate increased with increasing polymerization temperature, molar concentration of emulsifier and molar concentration of initiator and decreased with increasing molar concentration of VTMS. The apparent activation energy and kinetic features of the polymerization system were also obtained.
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