Studies on the Tacticity of Poly(methyl methacrylate) Synthesized by Atom Transfer Radical Polymerization

Abstract

Abstract: Two series of PMMA samples have been synthesized by Atom Transfer Radical Polymerization(ATRP) with and without catalytic promoter(aluminum isopropoxide, (i-PrO)₃Al in the temperature range of 0~100 ℃. Their tacticity has been determined by ¹³C Nuclear Magnetic Resonance(NMR). The results showed that the polymers by ATRP were all predominantly syndiotactic, and the tendency to form syndiotactic sequences decreased with the polymerization temperature increase. The tacticity of PMMA was influenced by catalytic promoter, [(i-PrO)₃Al], because it coordinates with the ester carbonyl group of polymer chain end. The activation parameters governing the tacticity of ATRP were calculated. The results indicate that the same type of active species is present in ATRP and conventional radical system.

Key words: Atom transfer radical polymerization, Tacticity, Poly(methyl methacrylate), ¹³C NMR

CLC Number:

O631

TrendMD:

QIAN Jun, GUO Jian-Hua, HAN Zhe-Wen, WU Ping-Ping . Studies on the Tacticity of Poly(methyl methacrylate) Synthesized by Atom Transfer Radical Polymerization[J]. Chem. J. Chinese Universities, 2000, 21(11): 1762.

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Studies on the Tacticity of Poly(methyl methacrylate) Synthesized by Atom Transfer Radical Polymerization

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