SYNTHESIS OF DIBLOCK COPOLYMERS BY END FUNCTIONAL POLYSTYRENE CONTAINING PHENYLSELENO GROUPS AS POLYMERIC PHOTOINIFERTER.

Autor: Seok Kwon, Tae, Takagi, Koji, Kunisada, Hideo, Yuki, Yasuo
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Zdroj: Journal of Macromolecular Science: Pure & Applied Chemistry; Sep2002, Vol. 39 Issue 9, p991-1006, 16p, 2 Charts
Abstrakt: Block copolymers of styrene and p-substituted styrene were prepared by photopolymerization of p-bromostyrene or p-methylstyrene in the presence of end functional polystyrene (DPDSE-PST) containing phenyl-seleno groups at the α and ω-chain ends as polymeric photoiniferter. To determine the form of resulting block copolymers, the behavior of chain terminals of DPDSE-PST was investigated. The ability of photoinitiate and chain transfer of β-phenylethyl p-tert-butylphenyl selenide as a model compound of α-chain end of DPDSE-PST was much smaller than that of benzyl phenyl selenide as a model compound of ω-chain end of DPDSE-PST. On the other hand, the polymerization of styrene, prepared by 1,4-Bis(p-tert-butylphenyl) diselenide as photoiniferter, with styrene also revealed a form of the resulting block copolymer was an AB block structure. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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