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- W2086808756 abstract "The effects of physical ageing on craze growth behaviour and toughness in a series of polystyrene/polybutadiene (PS/PB) diblock copolymers and diblock/polystyrene blends were studied. Samples with spherical rubber morphology were subjected to one of three thermal histories: quenching, slow cooling or isothermal ageing. Dynamic mechanical spectroscopy revealed significant ageing in the slow cooled and isothermally aged samples. The growth rates of crazes were measured in samples containing volume fractions of polybutadiene ranging from 6% to 18%. No change in craze growth rates occurred following ageing. The rates were successfully modelled using the meniscus instability mechanism with no adjustable parameters for the case of 6% PB. A quantitative analysis was made of the small effect of physical ageing on the thermal stresses that facilitate rubber cavitation and craze growth in the materials with high rubber content. Craze growth measurements on materials with 18% PB supported the analysis in that no change in craze growth rates due to physical ageing was observed. The measured rates for this sample were well described by a cavitation model for craze growth assuming a cavitation stress of 47 MPa. Tensile testing of the aged samples revealed no effect of ageing on the macroscopic toughness of the materials studied here." @default.
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- W2086808756 date "1988-07-01" @default.
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- W2086808756 title "Physical ageing and toughness of diblock copolymers" @default.
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- W2086808756 doi "https://doi.org/10.1016/0032-3861(88)90052-3" @default.
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