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Modification of the Phase Stability of Polymer Blends by Fillers



Alamgir Karim, D W. Liu, Jack F. Douglas, A Nakatani, Eric J. Amis


We investigate the influence of surface modified filler particles on the phase stability of a model blend of polystyrene (PS) and polybutadiene (PB). The upper critical solution cloud point curve of PS/PB is destabilized (upward shift of critical temperature) for bare (untreated) fumed silica filler particles, unchanged for fumed silica with end-grafted PS chains, and stabilized by fumed silica surface treated with silane coupling agents. These surface treatments were designed to modify the relative affinity of PS and PB for the surface of the fumed silica particles and show that the phase boundary can be controlled through a modification of the filler particle surface chemistry. The existence of phase boundary shifts have potential applications in commercial blends containing dispersions of filler particles.
No. 23


cloud point, filler, phase separation


Karim, A. , Liu, D. , Douglas, J. , Nakatani, A. and Amis, E. (2000), Modification of the Phase Stability of Polymer Blends by Fillers, Polymer, [online], (Accessed April 24, 2024)
Created October 31, 2000, Updated October 12, 2021