Cavitation mechanism related with crazing is investigated in high impact polystyrene (PS) with rubber particles of a rubbery corelglassy polymer shell. By transmission electron microscopic work using the annealing effect on craze, we verified that the rubber particles were cavitated after the crazing of PS matrix and that rubber components from rubbery core were sorbed into the crazes. And finite elemental analysis supported that the sorption to craze fibrils would plasticize the craze.
The toughening mechanisms of rubber-dispersed polymer alloys were investigated with respect to two factors: (i) characteristic ratio, C,, as a measure of chain flexibility of the polymer matrix and (ii) the rubber particle size in high impact polystyrene/poly(2,6-dimethyl-1,4-phenylene ether) blend systems. Measurements of the specific gravity, synchrotron radiation small angle X-ray scattering (SR-SAXS) tests, and finite element analysis were carried out to gain understanding of plastic deformation (crazing and shear yielding) of these materials. Shear yielding was found to be enhanced when the C, value of the matrix polymer was relatively low and the rubber particles were small (submicron). From these results, we presumed the impact energy absorption mechanisms to be governed by these two factors.
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