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- W1580452819 abstract "Mechanical testing of the elastic and viscoelastic response of an advanced thermoplastic polyimide (LaRC™-SI) with known variations in molecular weight was performed over a range of temperatures below the glass transition temperature. The notched tensile strength was shown to be a strong function of both molecular weight and temperature, whereas stiffness was only a strong function of temperature. A critical molecular weight was observed at a weight-average molecular weight of M̄w∼22 000 g/mol below which the notched tensile strength decreases rapidly. This critical molecular weight transition is temperature-independent. Low molecular weight materials tended to fail in a brittle manner, whereas high molecular weight materials exhibited ductile failure. Furthermore, low molecular weight materials have increased creep compliance and creep compliance rate and are more sensitive to temperature than the high molecular weight materials. At long timescales (>1100 h) physical ageing serves to significantly decrease the creep compliance and creep rate of all the materials tested. Low molecular weight materials are less influenced by the effects of physical ageing." @default.
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- W1580452819 date "2002-04-01" @default.
- W1580452819 modified "2023-10-17" @default.
- W1580452819 title "The role of molecular weight and temperature on the elastic and viscoelastic properties of a glassy thermoplastic polyimide" @default.
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- W1580452819 doi "https://doi.org/10.1016/s0142-1123(01)00072-x" @default.
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