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Physical ageing and glass transition in amorphous polymers as revealed by microhardness

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Abstract

Microhardness (MH) data as a function of temperature for two amorphous polymers [poly(methylmethacrylate) and poly(vinylacetate)] and two semicrystalline polymers [poly(ethyleneterephthalate) and poly(arylether ether ketone)] quenched into the amorphous state are presented. It is shown that MH can conveniently detect the glass transition temperature (T g) for the above mentioned polymers. Molecular rearrangements taking place above and belowT g, such as physical ageing leading to a more compact molecular packing, and thermal expansion can also be followed by means of MH measurements. Finally, the presence of a crystalline phase in these materials has been shown to shift theT g value towards higher temperatures.

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Authors and Affiliations

  1. Instituto de Estructura de la Materia, CSIC, Serrano 119, 28006, Madrid, Spain

    F. Ania, J. Martinez-Salazar & F. J. Baltá Calleja

Authors
  1. F. Ania
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  2. J. Martinez-Salazar
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  3. F. J. Baltá Calleja
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Ania, F., Martinez-Salazar, J. & Baltá Calleja, F.J. Physical ageing and glass transition in amorphous polymers as revealed by microhardness. J Mater Sci 24, 2934–2938 (1989). https://doi.org/10.1007/BF02385650

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  • DOI: https://doi.org/10.1007/BF02385650

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