Abstract
Free-radical copolymerizations of vinylbenzyl-terminated polystyrene (PS-VM; M 1) and methacryloyl-terminated poly(ethylene glycol methylether) (PEG-MC; M 2) were carried out in various solvents (benzene, 1,4-dioxane and N, N-dimethylformamide). The reactivity ratios obtained for the binary macromonomer systems were different from corresponding model system of styrene and methyl methacrylate ( r 1=0.52 and r 2=0.46) due to phase separation. PEG macromonomers could not interpenetrate sufficiently into propagating copolymer chains that had radical sites due to phase separation. On the other hand, the reactivity ratios ( r 1=0.25 and r 2=0.02) obtained for the binary copolymerizations of PS-VM and PEG-MC/tin tetrachloride macromonomers showed strong alternation. It was suggested that alternation results from the homopolymerization of 1:1 complexs formed between the donor and acceptor monomers.
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