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• W2015165793 abstract "We present an experimental study of real time true stress–strain–birefringence measurements to elucidate the sequence of structural mechanisms that occur during simultaneous biaxial stretching of PET films from amorphous precursors in rubbery state. Stress–birefringence relationship, wide angle X-ray diffraction, Raman spectroscopy and DSC thermal analysis were used to identify the stages of the mechano-optical behavior of the films during stretching, and to identify their structural origins. The measurements revealed four regimes for the relationship between the stress and birefringence. In the first regime the stress has a linear relationship with birefringence where the linear stress optical rule holds and the stress optical constant for PET is 5.8 GPa−1 (5800 Brewster). In the second regime, the relationship is also nearly linear with a steeper positive slope, and in the third regime the relationship is nonlinear. At very high stretching rates, a fourth stage could be seen, where the stress increases while the birefringence reaches a plateau. This stage is reached when the polymer chains attain their finite extensibilities. This stage was not observed if low rates of stretching employed, where high relaxation movements dominate the orientation effects. The deviation from the initial linear stress optical rule coincides with the onset of the stress-induced crystallization as revealed by the off line measurements. This transition was found to be rate dependent and increased rate delays this transition to higher stresses." @default.
• W2015165793 created "2016-06-24" @default.
• W2015165793 creator A5006508394 @default.
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• W2015165793 date "2013-11-01" @default.
• W2015165793 modified "2023-10-07" @default.
• W2015165793 title "Mechano optical behavior of polyethylene terephthalate films during simultaneous biaxial stretching: Real time measurements with an instrumented system" @default.
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• W2015165793 doi "https://doi.org/10.1016/j.polymer.2013.09.045" @default.
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