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E. Bociąga

The effect of methods of preparation of polymer test specimens on results of measurements

Polimery 1999, No 3, 198


DOI: dx.doi.org/10.14314/polimery.1999.198


Summary

Random-sampled test specimens of bulk polymers shaped by various techniques to achieve the desired geometrical shape and size prior to the test, may yield property data differing from those observed for the finished product, despite the fact that both have identical chemical compositions. Methods recommended by Polish Standards and ISO Standards to prepare test specimens are presented. To prepare test specimens from thermoplastics, a modem thermostatted injection mold (Fig. 1) is described, which meets the requirements of ISO Standards. Various reported data are intercompared to show the effects of processing technique (injection molding, extrusion, pressing) on the properties of test specimens (Figs. 10-13) and the effects of specimen size dimensions on mechanical property data (Figs. 14, 15). Regardless of the testing laboratory and the time of the test, consistent and repeatable data can be obtained provided that test specimens are prepared in a controlled manner and specimen size and dimensions conform with those recommended by Standards.


Keywords: polymer, test specimen, injection mold, press mold, processing parameters, measured data consistency

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