Synthesis of Crosslinkable Core-Shell Emulsion and Rheology of the Core-Shell/Amine Crosslinking Process
Starve feed and semi-continuous seed emulsion polymerization were used to control the morphology of core shell latex particles with a vinyl acetate (VAc)/vinyl ester of versatic acid 10(VeoVa10) copolymer core surrounded by a poly(glycidyl methacrylate) (PGMA) shell. Pure core and core-shell structures were confirmed by TEM. The results suggest that core-shell morphology of the two stage emulsion was favoured by higher concentration of emulsifier in the seed latex: the particle size distribution of core-shell latex was broader than that of the core latex, and the average particle size of core-shell latex was larger than that of the core latex. The core-shell structure was not produced using seed emulsion with emulsifier concentration at or below the critical micelle concentration. The core shell emulsion containing epoxy functional group with added ethylene diamine showed an abrupt increase in dynamic shear moduli, G and G and complex viscosity η* (several orders of magnitude) at about 35℃, during temperature ramps, over a wide range of angular frequencies. The time ramps showed that the crosslinking reaction did not occur at 15℃ for the core-shell emulsion/amine system. The time for gel formation decreased with increase in temperature.
emulsion polymerization core-shell particle poly(vinyl acetate) VeoVa10 glycidyl methacrylate rheology crosslinking amine
Jia Lu Allan J. Easteal D. Bhattacharyya Clive J. Bolt Neil R. Edmonds
Department of Chemistry, Auckland, Auckland, New Zealand Department of Mechanical Engineering, University of Auckland, Auckland, New Zealand
国际会议
青岛
英文
2203-2206
2009-10-09（万方平台首次上网日期，不代表论文的发表时间）