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Citation: 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, 10(4): 51-54. shu

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

1.
Department of Chemistry, Xiamen University, 361005 Xiamen

Received Date: 10 August 1992
Available Online: 15 March 1993

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.
- methyl methacrylate,
- styrene,
- emulsifier-free emulsion copolymerization,
- nucleation mechanism
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