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Photoviscoelastic behavior and residual thermal birefringence in optical-grade polycarbonates

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Abstract

The stress-optical coefficient functions of two optical-grade polycarbonates (PCs) have been obtained by simultaneous measurements of the relaxation modulus and strain-optical coefficient functions. Nonlinear behavior of the relaxation modulus and strain-optical coefficient was observed at small strains at room temperature. Comparison of these functions in the linear region with those of a commercial grade PC was made. These functions have been incorporated to linear viscoelastic and photoviscoelastic constitutive equations to calculate residual thermal birefringence in freely quenched PC plates. The numerical results have been compared with the measurements indicating a fair agreement between them.

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Acknowledgements

The authors greatly appreciate the financial support of the NSF Division of Engineering (DMI-0322920) and the General Electric Company (GE) for providing optical-grade PCs.

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Authors and Affiliations

  1. Institute of Polymer Engineering, The University of Akron, Akron, OH, 44325-0301, USA

    Tsui-Hsun Lin & Avraam I. Isayev

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  1. Tsui-Hsun Lin
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  2. Avraam I. Isayev
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Correspondence to Avraam I. Isayev.

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Lin, TH., Isayev, A.I. Photoviscoelastic behavior and residual thermal birefringence in optical-grade polycarbonates. Rheol Acta 47, 977–988 (2008). https://doi.org/10.1007/s00397-008-0290-3

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  • DOI: https://doi.org/10.1007/s00397-008-0290-3

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