Abstract
The effects of molecular weight and its distribution on fractural properties of polystyrene were studied at several elevated temperatures and various rates of strain. Logarithmic plots of ultimate strength σf against ultimate rate of strain γf, as well as of ultimate strain γf against dotγf at various temperatures, can be superposed by horizontal shifting into respective smooth master curves, giving the same shift factors. The shift factors are of the WLF type.Fractural behavior can be distinguished into four regions: brittle to ductile, ductile, ductile to flow, and flow regions. The effect of molecular weight is notable especially in the third and fourth regions, σf and γf plotted against γf become lower and lower as molecular weight decreases. When a low molecular weight component is included, σf and γf plotted against γf shift to the short, time-scale (high-rate strain) side.
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Onogi, S., Matsumoto, T. & Kamei, E. Effects of Molecular Weight and Its Distribution on Fractural Behavior of Polystyrene. Polym J 3, 531–537 (1972). https://doi.org/10.1295/polymj.3.531
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DOI: https://doi.org/10.1295/polymj.3.531
