Abstract
A Finite Element model to analyze the internal residual stress in a core-shell latex particle composed of polystyrene and acrylonitrile is developed. The internal stress distribution is postulated to control the stability of the resulting latex. The internal residual stress distribution is assumed generated by a thermal expansion mismatch of the two different materials with corresponding different thermal properties. Variation of thermal and materials properties in the graft region due to the composition changes of the materials is included. Several models with different amounts of graft region and without a graft region are investigated. The results of the analysis show that the hoop tension stress in acrylonitrile increases considerably with decreasing graft region. This greater hoop tension stress is one of the contributing factors that causes more failure in the acrylonitrile in less grafted or nongrafted latex particles, allowing phase separation of the polystyrene out of the shell. In this paper, the effect of the graft region on the internal stress distribution has been quantified, allowing a core-shell system to be designed for reduced residual stresses.
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