Abstract
Although copolymers of styrene(PS) and methyl methylacrylate(PMMA) showed slightly higher flexural strengths than the homopolymers, blends showed markedly lower strengths, the decrease being greatest at ca 50% styrene. There was a decrease in modulus, but an increase in the elongation to break attributable to the two-phase morphology. The effect of various radiation doses on flexural strength is demonstrated. The decreases in strength reflect decreases in fracture strain, only a small change in modulus being observed. The compressive strength showed similar relationships with composition and dose. The dose dependence of the flexural strength was approximately exponential, and degradation rates could be calculated. The observed relationship between the rates of radiation-induced degradation of PS/PMMA blends, measured by the decrease in flexural strength, or from the initial rates of degradation and the compositions of the blends, is illustrated. 3 figures.
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