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Processing Induced Properties In Glassy Polymers: Application Of Structural Relaxation To Yield Stress Development

T. Engels, Leon Le Govaert, G. Peters, H. Meijer
Published 2006 · Materials Science

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A method is presented to predict the yield stress distribution throughout an injection-molded product of an amorphous polymer as it results from processing conditions. The method employs the concept of structural relaxation combined with a fictive temperature, following the Tool-Narayanaswamy-Moynihan formalism. The thermal history, as it is experienced by the material during processing, is obtained by means of numerical simulation of the injection molding process. The resulting predic- tions of yield stress distributions are shown to be in excellent agreement with experi- mental findings, both for different mold temperatures and for different part thick- nesses. V C 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 1212-1225, 2006
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