Premium
Dynamic relaxations in a bio‐based polyamide with enhanced mechanical modulus
Author(s) -
Haddou G.,
Roggero A.,
Dandurand J.,
Dantras E.,
Ponteins P.,
Lacabanne C.
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.46846
Subject(s) - dynamic mechanical analysis , polyamide , glass transition , viscoelasticity , relaxation (psychology) , materials science , dynamic modulus , polymer chemistry , differential scanning calorimetry , calorimetry , thermodynamics , dielectric , modulus , crystallization , arrhenius equation , polymer , composite material , chemistry , activation energy , physics , psychology , social psychology , optoelectronics
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. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46846.