Polymerization of poly(dimethylsiloxane) macromers: 1. Copolymerization with styrene |
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Authors: | GGordon Cameron Michael S Chisholm |
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Affiliation: | Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen, AB9 2UE, UK |
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Abstract: | The synthesis and characterization of methacrylate-ended macromers ( 500 to 10 000) and their copolymerization with styrene (M2) is described. The experimental errors in the values of the reactivity ratios r1 render them meaningless. Values of r2 can be determined with more precision and increase from 1.06 to 1.55 as the molecular weight of the macromer increases. This behaviour is due to steric effects, not diffusion-controlled propagation. It is shown that the assumptions that and are only valid for macromers of . |
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Keywords: | poly(dimethyl siloxane) macromers synthesis characterization copolymerization reactivity ratios |
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