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- W1969661444 abstract "Abstract The uniaxial compression stress-strain curves of the loading and unloading cycle and the corresponding maximum points of yield for poly(methyl methacrylate) in the temperature range, T = 233–343K and engineering strain range, e t = 10 −4 –10 −1 s −1 are measured. A micromechanics model for the thermally activated plastic deformation of glassy polymer is suggested and the exact theoretical expression for plastic strain rate, e p , is obtained. The thermodynamic parameters characterizing the plastic deformation process, including activation volume, Va, activation enthalpy, ΔH, and activation entropy, ΔS, and their curved profiles changing with condition variables T and e t are provided. The number of structural repeat units in a Va for various T and e t values are calculated. The changing trends of parameters ΔH and ΔS with Va and the relationships between ΔH and ΔS for various T and e t are presented and compared with that between ΔHm and ΔSm for viscous flow in the molten state of the same polymer. The results show that the plastic deformation of glassy polymer can be regarded thermodynamically as the non-Newtonian viscous flow of overcooled melt." @default.
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- W1969661444 date "1992-01-01" @default.
- W1969661444 modified "2023-09-27" @default.
- W1969661444 title "Analysis of thermally activated plastic deformation for glassy polymer poly(methyl methacrylate)" @default.
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- W1969661444 doi "https://doi.org/10.1016/0032-3861(92)90047-z" @default.
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