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synopsisThe addition of a miscible phthalate polyester to BPA polycarbonate results in a remarkable improvement in stress cracking resistance in strong swelling agents. Comparative measure ments of solvent craze initiation resistance, craze strengths, degrees of swelling, and crystallization behavior have been made. The results indicate that the improvement in cracking resistance probably results from stabilization of the craze fibrils by crystallization of the polyester before and/or during fibril formation.

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