Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Guiomar Hernández
ORCID logo ,
Sergio Ferrero
,
Helmut Reinecke
,
Camino Bartolomé
,
Jesús M. Martinez-Ilarduya
,
Cristina Álvarez
ORCID logo ,
Ángel E. Lozano
* ORCID logo
Version 1 : Received: 15 January 2023 / Approved: 23 January 2023 / Online: 23 January 2023 (02:00:35 CET)

A peer-reviewed article of this Preprint also exists.

Hernández, G.; Ferrero, S.; Reinecke, H.; Bartolomé, C.; Martinez-Ilarduya, J.M.; Álvarez, C.; Lozano, Á.E. New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTA. Int. J. Mol. Sci. 2023, 24, 2734. Hernández, G.; Ferrero, S.; Reinecke, H.; Bartolomé, C.; Martinez-Ilarduya, J.M.; Álvarez, C.; Lozano, Á.E. New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTA. Int. J. Mol. Sci. 2023, 24, 2734.

Abstract

By employing a variation of the polyamidation method using in situ silylated diamines and acid chlorides, it has been 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 in using, together with the silylating agent, a mixture of pyridine and a high pKa tertiary amine. The research has been complemented by a combination of nuclear magnetic resonance and molecular simulation studies, which have determined that the improvements in molecular weight derive mainly from the formation of silylamide groups in the growing polymer.

Keywords

polyamidation; in situ silylation; poly(p-phenylene terephthalamide (PPTA); Kevlar; NMR; DFT molecular simulation

Subject

Chemistry and Materials Science, Polymers and Plastics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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