Stability of Emulsifier-free Emulsion Copolymerization of MMA/BA/Comonomer with Two Functional Groups

Abstract

Abstract: Aseries of functional comonomers with anionic and nonionic hydrophilic groups, sodium glycol maleate(SGM, or I-1) and sodium polyethylene glycol maleate (SPEGM, or I-2, I-4 and I-6) made from polyethylene glycol PEG200, PEG400 and PEG600, were synthesized and used in MMA/BAemulsifier-free emulsion copolymerization. The effects of the spatial effect, concentration and feeding mode of comonomer on the stability of the emulsifier-free latexes(EFL) were investigated. The stable and almost monodispersed EFLcan be obtained with appropriate comonomer and semicontinuous feeding mode. Coagulum in the emulsifier-free emulsion polymerization system was formed mainly by destabilizing coagulation mechanism owing to insufficient protecting groups on particles and by bridging coagulation mechanism caused by water-soluble homopolymer of comonomers or copolymers enriched with such comonomers.

Key words: Emulsifier-free latex, Comonomer with two functional groups, Spatial effect, Stability, Coagulation mechanism

CLC Number:

TQ316.334.

TrendMD:

ZHANG Mao-Gen, WENG Zhi-Xue, HUANG Zhi-Ming, MAO Xin, PAN Zu-Ren . Stability of Emulsifier-free Emulsion Copolymerization of MMA/BA/Comonomer with Two Functional Groups[J]. Chem. J. Chinese Universities, 1998, 19(11): 1848.

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Stability of Emulsifier-free Emulsion Copolymerization of MMA/BA/Comonomer with Two Functional Groups

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