Kinetik der radikalischen copolymerisation α‐substituierter styrole mit styrol. 3. Teil. Das zusammenwirken von copolymerisation, retardierung und kettenübertragung in abhängigkeit von der chemischen struktur
1972; Wiley; Volume: 155; Issue: 1 Linguagem: Inglês
10.1002/macp.1972.021550121
ISSN0025-116X
Autores Tópico(s)Catalytic Alkyne Reactions
ResumoAbstract The copolymerization of styrene with a series of ten α‐substituted styrenes, partially synthesized for the first time, was investigated by kinetic measurements. All compounds react with styrene according to the mechanism of copolymerization. The extent of the observed retardation or chain transfer reaction depends on the chemical nature of the α‐substituent. Some α‐alkylstyrenes scarcely show chain transfer, yet the more bulky the α‐substituent is, the more retardation could be observed. On the other hand α‐arylalkylstyrenes of the type of 4‐substituted 2.4‐diphenyl‐1‐butene‐derivates cause an evident chain transfer as can be seen from the chain transfer constants of 0,29 and 0,26 from 4‐methyl‐2.4‐diphenyl‐1‐pentene and 2.4.4‐triphenyl‐1‐pentene, respectively. The single rate constants of chain propagation and chain transfer are calculated or estimated.
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