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- W2072146069 abstract "The stress-induced birefringence in quenched polycarbonate discs is calculated with a numerical program and compared with birefringence measurements. Use is made of a thermo-viscous-elastic model with a discontinuous change of the properties at the glass transition temperature, Tg. The birefringence is calculated with the aid of the stress-optical rule using the measured stress-optical coefficients in the molten and glassy states. The birefringence present at the moment of glass transition is ‘frozen in’ and added to the birefringence that builds up below Tg. The calculated birefringence distributions fit the distributions measured in cross-sections of the samples. The birefringence distributions are unbalanced because of the contribution of frozen-in orientation, induced by the cooling stresses above Tg. In constrained quenching the contact with the wall leads to high tensile stresses in the melt, which, depending on the adhesion of the polymer to the wall, induce unexpected birefringence distributions." @default.
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- W2072146069 date "1989-06-01" @default.
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- W2072146069 title "The measurement and calculation of birefringence in quenched polycarbonate specimens" @default.
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- W2072146069 doi "https://doi.org/10.1016/0032-3861(89)90095-5" @default.
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