Free radical-initiated copolymerization of 2,6-dichlorostyrene with maleimide, N-methylmaleimide, and N-phenylmaleimide

摘要

The free-radical-initiated copolymerization of 2,6-dichlorostyrene (2,6-DC1St), with maleimide (MI), N-methylmaleimide (NMeMI) and N-phenylmaleimide (NPhMI) was carried out in butanone or in toluene at 65 degrees C with different monomer-to-monomer ratios in the feed. The copolymer composition was evaluated by chlorine content in polymers. The reactivity ratios determined by Kelen-Tudos method indicate the random arrangement of monomers in copolymer chains. In all studied systems, azeotropic points were observed at ratios of: 0.5 (2,6-DC1St) to 0.5 (MI) and 0.4 (2,6-DC1St) to 0.6 (NMeMI and NPhMI). Molecular weights of copolymer, which contain equimolar ratio of 2,6-DC1St-co-MI, NMeMI, and NPhMI are: M-w.10(-3) = 46.1; 90.4; 81.4. M(n)10(-3) = 27.1; 46.0; 37.0. The copolymers are thermostable, film forming materials, which decompose by one-step mechanism between 400 degrees C, and 500 degrees C. The T-g's are linearly distributed between T-g's of homopolymers and in all cases, single well defined T-g's are obtained. [References: 17]