Naslov
Copolymerization and copolymers of 2, 4, 5-tribromostyrene with styrene and acrylonitrile

Autori
Janović, Zvonimir ; Tomašek, Ljubica ; Malavašič, Tatjana

Izvornik
Journal of Macromolecular Science. Part A (1060-1325) 33 (1996), 6; 735-746

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

Ključne riječi
tribromostyrene; styrene; acrylonitrile; copolymerization; copolymers; copolymerization reactivity ratios; glass transition; thermal stability

Sažetak
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 r1 = 1.035 ± 0.164 (TBSt) and r2 = 0.150 ± 0.057 (St), and for the system TBSt/AN r1 = 2.445 ± 0.270 (TBSt) and r2 = 0.133 ± 0.054 (AN). The e and Q values were also calculated. The initial copolymerization rate, Rp, 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.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA