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Thermomechnical properties of unidirectional composites in their transition region

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  • Polymer Science
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Summary

The thermomechanical behaviour of polymeric matrices reinforced with long unidirectional fibres in their glass transition region was investigated. Based on rigorous theories for the mechanical moduli and the coefficients of thermal expansion for viscoelastic composites, it was proved analytically that the introduction of reinforcing fillers in polymeric matrices causes glass transition temperature to increase to an extent proportional to the reinforcing effect. This is confirmed by numerous experimental results available in the literature, except for highly-filled composites, where imperfect adhesion may counterbalance the reinforcing effect. Dilatometric as well as two different dynamic mechanical tests confirmed the latter. The variation of glass transition temperature as function of the various aspects of mechanical reinforcement was investigated.

Zusammenfassung

Das thermomechanische Verhalten von mit einachsig verstreckten Faserstücken verstärktem Polymermaterial im Glasübergangsbereich ist Gegenstand der hier diskutierten Untersuchungen. Basierend auf strengen Theorien für die mechanischen Moduln und die Koeffizienten der thermischen Ausdehnung für viskoelastische Mischsubstanzen wurde analysiert, wie eine Einführung des Füllmaterials in die polymere Matrix zu einem Anstieg der Glastemperatur proportional zur Verstärkerwirkung des Füllers bewirkt. Das wird durch ein ausgiebiges experimentelles Material aus der Literatur bestätigt. Nur bei hochgefüllten Mischungen stört unvollständige Adhäsion die Verstärkerwirkung. Dies läßt sich auch dilatometrisch sowie auf zwei verschiedene andere Weisen mit mechanischen Testen zeigen.

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Authors and Affiliations

  1. Department of Civil Engineering, National Technical University of Athens, 42. 28th October St., 147, Athens, Greece

    S. A. Paipetis

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Paipetis, S.A. Thermomechnical properties of unidirectional composites in their transition region. Colloid & Polymer Sci 258, 42–50 (1980). https://doi.org/10.1007/BF01474952

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  • DOI: https://doi.org/10.1007/BF01474952

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