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

Autori
Erceg, Ana ; Vuković, Radivoje ; Bogdanić, Grozdana ; Fleš, Dragutin

Izvornik
Journal of macromolecular science : pure and applied chemistry (1060-1325) A37 (2000), 5; 513-524

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
2;6-dichlorostyrene; poly[2;6-dichlorostyrene-co-maleimide (N-methylmaleimide and N-phenylmaleimide)]; mechanism of copolymerization; reactivity ratios; thermal properties

Sažetak
The free-radical-initiated copolymerization of 2,6-dichlorostyrene (2,6-DClSt), with maleimide (MI), N-methylmaleimide (NMeMI) and N-phenylmaleimide (NPhMI) was carried out in butanone or in toluene at 65°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-Tüdős 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-DClSt) to 0.5 (MI) and 0.4 (2,6-DClSt) to 0.6 (NMeMI and NPhMI). Molecular weights of copolymer which contain equimolar ratio of 2,6-DClSt-to-MI, NMeMI and NPhMI are: Mwx10-3 = 46.1; 90.4; 81.4. Mnx10-3 = 27.1; 46.0; 37.0. The copolymers are thermostable, film forming materials, which decompose by one-step mechanism between 400°C, and 500°C. The Tg´s are linearly distributed between Tg´s of homopolymers and in all cases single well defined Tg´s are obtained.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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