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

Ming Li, Theo J. Dingemans

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)372-382
Number of pages11
JournalPolymer
Volume108
DOIs
Publication statusPublished - 13 Jan 2017

Keywords

  • Reactive PA oligomers
  • Semi-crystalline thermosets
  • Thermal cure

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