ON NUCLEATION MECHANISM IN EMULSIFIER-FREE EMULSION COPOLYMERIZATION OF METHYL METHACRYLATE AND STYRENE

Chinese Journal of Applied Chemistry ›› 1993, Vol. 0 ›› Issue (4): 51-54.

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ON NUCLEATION MECHANISM IN EMULSIFIER-FREE EMULSION COPOLYMERIZATION OF METHYL METHACRYLATE AND STYRENE

Dai Lizong, Zou Yousi, Chen Shiqun, Pan Ronghua

Department of Chemistry, Xiamen University, 361005 Xiamen

Received:1992-08-10 Revised:1993-03-15 Published:1993-08-10 Online:1993-08-10

Abstract

Abstract: The emulsifier-free emulsion copolymerization of MMA with St has been carried out. At 70℃, [KPS]=5.55×10^-3mol/L, [MMA]=0.51mol/L and [St]=0.49mol/L a higher conversion, smaller emulsion particles and greater concentration of particles can be obtained. A homogeneous nucleation mechanism has been proposed on the basis of the molecular weight and its distribution measurements in the course of the copolymrization. When the value of conversion exeessed 30.9%, the agglutination degree of the emulsion particles surpassed the formation speed of the particles. Radicles formed from KPS on decomposition appeared to stabilize the emulsion.

Key words: methyl methacrylate, styrene, emulsifier-free emulsion copolymerization, nucleation mechanism

Dai Lizong, Zou Yousi, Chen Shiqun, Pan Ronghua. ON NUCLEATION MECHANISM IN EMULSIFIER-FREE EMULSION COPOLYMERIZATION OF METHYL METHACRYLATE AND STYRENE[J]. Chinese Journal of Applied Chemistry, 1993, 0(4): 51-54.

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ON NUCLEATION MECHANISM IN EMULSIFIER-FREE EMULSION COPOLYMERIZATION OF METHYL METHACRYLATE AND STYRENE

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