Abstract
The plane strain fracture toughness, K IC, of a series of styrene copolymers with acrylonitrile (SAN), maleic anhydride (SMA) and acrylic acid (SAA) plus blends (50:50) of poly(methyl methacrylate) (PMMA) with various SAN copolymers are reported. Relative to polystyrene, the values of K IC for the copolymers increase with acrylonitrile content but decrease with maleic anhydride or acrylic acid content. The K IC values for SAN copolymers are lowered by addition of PMMA but are maximum in the AN range where SAN is miscible with PMMA. The toughness of rubber modified blends of these materials correlate with the K IC of the matrix.
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