Copolymerization and Copolymers of 2,4,5-Tribromostyrene with Styrene and Acrylonitrile |
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| Authors: | Z Janovi? Lj Toma?ek T Malava?i? |
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| Institution: | 1. Faculty of Chemical Engineering and Technology University of Zagreb , Zagreb, Croatia;2. National Chemical Institute , Ljubljana, Slovenia |
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| Abstract: | Abstract 2,4,5-Tribromostyrene (TBSt) was copolymerized with styrene (St) or acrylonitrile (AN) in toluene solution using 2,2′-azobisisobutyronitrile as free radical initiator. The copolymerization reactivity ratios were found to be for the system TBSt/St r 1 = 1.035 ± 0.164 (TBSt) and r 2 = 0.150 ± 0.057 (St), and for the system TBSt/AN r 1 = 2.445 ± 0.270 (TBSt) and r 2 = 0.133 ± 0.054 (AN). The e and Q values were also calculated. The initial copolymerization rate, R p, for both systems linearly increases as the content of TBSt in the monomer mixture increases. However, these values are somewhat higher when AN was used as a comonomer. A similar behavior has also been established for the course of the copolymerization reactions to high conversion. The resulting copolymers and TBSt-homopolymer show similar thermal stabilities of polystyrene. However, the glass transition temperature increases markedly with increasing TBSt content. |
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