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Long term ageing of polyamide 6 and polyamide 6 reinforced with 30% of glass fibers: physicochemical, mechanical and morphological characterization

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Abstract

Hygrothermal ageing of polyamide 6 (PA6) and polyamide 6 reinforced with 30 wt% of glass fibers (PA6GF30) was undertaken. Immersion was conducted in distilled water at 90 °C and 100% relative humidity (RH) for up to 80 days (1920 h). Results revealed a noteworthy decrease either in glass transition temperature Tg or in tensile properties, at early stage of ageing, for both studied materials. This decline was mainly caused by the plasticization effect of water and the weakness of the interfacial interactions leading as a consequence to a loss of adhesion between fiber and matrix. Afterwards, physical and mechanical properties decrease monotonically testifying the occurrence of exhaustive damages and chemical reaction phenomena. Such phenomena were yellowing and crazing formation which were observed for both materials after 1920 h of conditioning. The former is caused by the thermo- oxidation whereas the latter results from the release of internal stresses induced by water sorption. These chemical reactions were monitored by infrared spectroscopy. Thus, an increase of the free N-H stretch and the carbonyl groups (imides) was noted. Accordingly, it seems that long term immersion in distilled water at high temperature induces chemical reactions which indicate the severity of the damage.

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Acknowledgements

The authors appreciate the helpful discussions and suggestions provided by Dr. Noamen Guermazi. Authors would like also to thank ICA team (EMAC-France) especially Pr. Thierry Cutard, E. Ramirez, S. Tovar,V. Vidal, and K. Choquet, for their help provided for this research project. This work was supported by the Ministry of Higher Education and Scientific Research- Tunisia.

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Authors and Affiliations

  1. Laboratoire de Génie des Matériaux et Environnement (LGME), Ecole Nationale d’Ingénieurs de Sfax (ENIS), Université de Sfax, BP 1173, Sfax, 3038, Tunisia

    Imen Ksouri & Nader Haddar

  2. Institut Clément Ader (ICA), CNRS, Mines Albi, UPS, INSA, ISAE-SUPAERO, Université de Toulouse, CT Cedex 09, Campus Jarlard, Albi, 81013, France

    Imen Ksouri & Olivier De Almeida

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  1. Imen Ksouri
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Ksouri, I., De Almeida, O. & Haddar, N. Long term ageing of polyamide 6 and polyamide 6 reinforced with 30% of glass fibers: physicochemical, mechanical and morphological characterization. J Polym Res 24, 133 (2017). https://doi.org/10.1007/s10965-017-1292-6

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  • DOI: https://doi.org/10.1007/s10965-017-1292-6

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