Controlled Sequential Polymerization of PS-PMA-PS by ATRP

Abstract

Abstract:

Polystrene-Polymethyl acrylate-Polystyrene tri-block copolymer (PS-PMA-PS) was synthesized by modified atom transfer radical polymerization. Using CuCl/α,α'-Bipyridyl complex as catalyst, initiated by 1-PECl,styrene was first polymerized at 130℃. Then using the product as macroinitiator, the di-block (PS-PMA) copolymer were obtained. Meanwhile the tri-block copolymer has also been prepared after adding styrene and actone/l-propanol into the reaction system. PS-PMA-PS was characterized by ¹H-NMR and GPC techniques. The results show that the molecular weight distribution of the tri-block copolymer is narrow (M_wM_n=1.19) as the conversion of monomer is around 70-85%. The molecular weight of the block is in good agreement with designed value. The NMR testified the structure of PS-PAA-PS which was obtained by hydrolyzing PS-PMA-PS.

Key words: Atom transfer radical polymerization, tri-block copolymer, hydrolysis

CLC Number:

O614

TrendMD:

GAO Li-Chao, SHI Lin-Qi, ZHANG Wang-Qing, GAO Jun-Gang, HE Bing-Lin. Controlled Sequential Polymerization of PS-PMA-PS by ATRP[J]. Chem. J. Chinese Universities, 2001, 22(S1): 232.

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Controlled Sequential Polymerization of PS-PMA-PS by ATRP

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