Synthesis and characterization of semi-crystalline poly(decamethylene terephthalamide) thermosets

Journal Article (2017)
Author(s)

M Li (TU Delft - Novel Aerospace Materials, Dutch Polymer Institute)

TJ Dingemans (TU Delft - Novel Aerospace Materials)

Research Group
Novel Aerospace Materials
DOI related publication
https://doi.org/10.1016/j.polymer.2016.12.004
More Info
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Publication Year
2017
Language
English
Research Group
Novel Aerospace Materials
Volume number
108
Pages (from-to)
372-382

Abstract

We have explored the synthesis of semi-crystalline polyamide (PA) thermosets via a reactive PA oligomer precursor route. Poly(decamethylene terephthalamide) (PA 10T) oligomers with a target Mn of 1 K and 3 K g·mol−1 were synthesized via solution polymerization and end-capped with reactive phenylethynyl (PE) groups. The reactive oligomers could be cured in a stepwise manner using successive high temperature treatment steps. Depending on the concentration of PE end-groups, the degree of crystallinity of the final thermosets can be controlled and depressed by 60% for the crosslinked 3 K precursor and completely eliminated for the crosslinked 1 K precursor. From the calculated molecular weight between crosslinks, we estimated that 35–41% of the PE end-groups form crosslinking functionalities and the remainder of the PE end-groups contribute to chain extension. All thermoset films are stable up to ∼400 °C in DMTA experiments due to network formation, effectively increase the maximum use temperature of PA 10T by 100 °C.

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