Dynamic relaxations in a bio-based polyamide with enhanced mechanical modulus

Abstract : A new grade of bio-based polyamide (PA)—PA meta-xylylene diamine 10 (PA mXD 10)—was investigated. Its first interest is that it permits mild processing conditions at about 200°C. The calorimetric study shows the existence of two cold crystallizations indicative of slow crystallization rate. The glass transition stabilizes at 55°C. By combining calorimetry with dynamic mechanical analysis and dynamic dielectric spectroscopy, we found a perfect consistency between the set of data giving the molecular mobility. The localized relaxations follow Arrhenius equations while the viscoelastic transition follows a Vogel–Fulcher–Tammann law. The compilation of all the relaxation times determined by means of the different analyses highlights a good correlation. This result is perfectly explained by the polarity of the macromolecular chain. The dynamic mechanical behavior showed a storage modulus higher than for the corresponding aliphatic PA and nearly constant until room temperature.
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Journal of Applied Polymer Science, Wiley, 2018, 135 (47), pp.1-6. 〈10.1002/APP.46846〉
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https://hal.archives-ouvertes.fr/hal-01962043
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Geoffrey Haddou, Aurélien Roggero, Jany Dandurand, Eric Dantras, Philippe Ponteins, et al.. Dynamic relaxations in a bio-based polyamide with enhanced mechanical modulus. Journal of Applied Polymer Science, Wiley, 2018, 135 (47), pp.1-6. 〈10.1002/APP.46846〉. 〈hal-01962043〉

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