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- W2114739498 abstract "Abstract Tensile stress‐relaxation experiments with simultaneous measurements of Young's relaxation modulus, E , and the strain‐optical coefficient, C ϵ , were performed on two amorphous polymers—polystyrene (PS) and polycarbonate (PC)—over a wide range of temperatures and times. Master curves of these material functions were obtained via the time‐temperature superposition principle. The value of C ϵ of PS is positive in the glassy state at low temperature and time; then it relaxes and becomes negative and passes through a minimum in the transition zone from the glassy to rubbery state at an intermediate temperature and time and then monotonically increases with time, approaching zero at a large time. The stress‐optical coefficient of PS is calculated from the value of C ϵ . It is positive at low temperature and time, decreases, passes through zero, becomes negative with increasing temperature and time in the transition zone from the glassy to rubbery state, and finally reaches a constant large negative value in the rubbery state. In contrast, the value of C ϵ of PC is always positive being a constant in the glassy state and continuously relaxes to zero at high temperature and time. The value of C σ of PC is also positive being a constant in the glassy state and increases to a constant value in the rubbery state. The obtained information on the photoelastic behavior of PS and PC is useful for calculating the residual birefringence and stresses in plastic products. © 2001 John Wiley & Sons, Inc. J Polym Sci Part B: Polym Phys 39: 2252–2262, 2001" @default.
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- W2114739498 date "2001-08-17" @default.
- W2114739498 modified "2023-10-10" @default.
- W2114739498 title "Photoviscoelastic behavior of amorphous polymers during transition from the glassy to rubbery state" @default.
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- W2114739498 doi "https://doi.org/10.1002/polb.1199" @default.
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