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Positron annihilation lifetime measurements were performed on amorphous styrene-maleic anhydride and styrene-acrylonitrile copolymers of different compositions. Glass transition temperatures of the copolymers were determined by differential scanning calorimetry and densities and specific volumes were obtained with a gas pycnometer. The average free-volume hole size measured by the positron lifetime...
The effect of two poly(styrene-graft-ethylene oxide)s with different graft lengths and graft densities on the interphase properties of poly(2,6-dimethyl-1,4-phenylene oxide)/poly(methyl methacrylate) (PPO/PMMA) blends was studied by different techniques. The miscibility between the copolymers and the homopolymers, as well as the phase reduction in the ternary blends, was favoured by longer and more...
A brief literature survey is presented on the models predicting the composition dependence of fracture properties of heterogeneous polymer systems. Some of the models cannot predict composition dependence properly or are limited to a narrow composition range, while more exact ones are difficult to use because of their complexity. A different approach is presented, which takes into consideration...
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