Title: THERMODYNAMIC AND KINETIC CONSIDERATIONS – EFFECT OF ORGANIC SILOXANE ON MMA POLYMERIZATION
Page Range: p.505-512
Author(s): Xiaobo Deng; Shunsheng Cao; Bailing Liu; Songjun Li
File size: 114K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 13
Issue No: No. 5
Abstract
This study discusses the reasons for an increase or decrease in the conversion and polymerisation rates of siloxane-acrylate copolymers, and highlights some extra information related to the copolymerisation process. The effects of 3-(methacryloxypropyl)-trimethoxysilane (MATS) and vinyl trimethoxysilane (VTMOS) on methyl methacrylate (MMA) polymerisation are thus investigated. The two co-monomers appear to show opposite effects. The polymerisation shows a high rate of polymerisation and extend of conversion in the presence of MATS, than in its absence. However, a lower rate of polymerisation and extent of conversion are obtained in the presence of VTMOS. The difference is explained in terms of the different roles of the co-monomers. The increase in the rate of polymerisation and conversion with MATS was attributed to the higher reactivity of monomers and the lower conversion with VTMOS was attributed to the electronic effects associated with VTMOS which can decrease the electric density of the active double bond in MMA, and therefore deactivate the polymerisation. Further investigation indicated that the change of free energy in the polymerisation with MATS was lower than without MATS. In addition, monomer reactivity in the presence of MATS was higher than in its absence. The decrease in monomer reactivity is thought to be responsible for increasing the rate of polymerisation. 24 refs.
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