Abstract
Failure in zinc polycarboxylate cements has been studied using a linear elastic fracture mechanics approach. The toughness, fracture toughness, and flexural strength increase with the poly(acrylic acid) chain length. The dependence of toughness on the poly(acrylic acid) molecular weight is not as large as predicted by a chain pull-out model for fracture. The poly(acrylic acid) chain length has a more pronounced effect than with the related glass-polyalkenoate cement, indicating that the cross-links between the chains are weaker in these cements.
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