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Issue 8, 2020
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Stronger aramids through molecular design and nanoprocessing

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We introduce oligo-(1,6-pyrene terephthalamide, oPyrTA) as an oligoamide model for Kevlar®. Through comparison with an oligo-(p-phenylene terephthalamide, oPTA) of similar molecular weight, this work shows that the incorporation of polycyclic aromatic pyrene moieties improves drastically the mechanical properties of the structure, increasing elastic nanoindentation-determined modulus and hardness by factors of 1.9 and 4.3, respectively. Liquid deprotonated dispersions of oPyrTA nanofibers were used as nanoscale building blocks for producing large-surface, free-standing oligomer macroscopic nanofilms. This 2D assembly leads to further significant improvements in reduced modulus and hardness (more than twice) compared to the starting oligomer macroscale fibres, due to a better re-organizational arrangement of the oPyrTA nanofibers in the nanofilms, formed under 2D spatial confinement.

Graphical abstract: Stronger aramids through molecular design and nanoprocessing

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Article information

23 Oct 2019
07 Jan 2020
First published
08 Jan 2020

Polym. Chem., 2020,11, 1489-1495
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Stronger aramids through molecular design and nanoprocessing

A. Rapakousiou, A. López-Moreno, B. Nieto-Ortega, M. M. Bernal, M. A. Monclús, S. Casado, C. Navío, L. R. González, J. P. Fernández-Blázquez, J. J. Vilatela and E. M. Pérez, Polym. Chem., 2020, 11, 1489
DOI: 10.1039/C9PY01599J

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