Abstract
A linear elastic fracture mechanics approach has been used to characterize failure in glass-ionomer cements. The toughness, fracture toughness, flexural strength and inherent flaw size increase with the molecular weight of the poly(acrylic acid), whilst the Young's modulus remains approximately constant. The dependence of toughness on poly(acrylic acid) molecular weight is not as large as predicted by a reptation/chain pull out model for fracture and this is thought to be a result of the weak ionic crosslinks formed during the cement reaction.
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