N-(2,4,6-Tribromophenyl)maleimide (TBPMI) was copolymerized with methyl acrylate (MA) or methyl methacrylate (MMA) in toluene solution using 2,2'-azoisobutyronitrile as free-radical initiation. The copolymerization reactivity ratios were found to be for the system TBPMI/MA r l = 0,095 i. 0,045 (TBPMI) and r2 = 2,17 5 0,142 (MA) and for the system TBPMVMMA rl = 0,037 -+ 0,042 (TBPMI) and r2 = 4,32 f 0,230 (MMA); Q and e values were also calculated. The initial rate of copolymerization, R,, for TBPMI/MA sharply decreases as the content of TBPMI in the monomer mixture increases but the composition of the feed does not have a strong influence on R, for the TBPMI/MMA copolymerization system. The course of copolymerization to high conversion is characterized by an increase of conversion up to a mole fraction of TBPMI of 0,7 in the monomer mixture, when MA was used as the comonomer. An opposite behaviour was found with MMA. Its copolymers show a considerable increase of thermal stability as well as of the glass transition temperatures with increasing TBPMI content.
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