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New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTA.

Guiomar HernándezSergio FerreroHelmut ReineckeCamino BartoloméJesús M Martinez-IlarduyaCristina ÁlvarezÁngel E Lozano
Published in: International journal of molecular sciences (2023)
By employing a variation of the polyamidation method using in situ silylated diamines and acid chlorides, it was possible to obtain a rod-type polyamide: poly( p -phenylene terephthalamide) (PPTA, a polymer used in the high-value-added material Kevlar), with a molecular weight much higher than that obtained with the classical and industrial polyamidation method. The optimization of the method has consisted of using, together with the silylating agent, a mixture of pyridine and a high-pKa tertiary amine. The research was complemented by a combination of nuclear magnetic resonance and molecular simulation studies, which determined that the improvements in molecular weight derive mainly from the formation of silylamide groups in the growing polymer.
Keyphrases
  • magnetic resonance
  • heavy metals
  • single molecule