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‘Phoenix polymers’: fire induced nanohardness in fibril-forming aromatic cyanate esters

Mooring, Lyndsey, Thompson, Scott, Hall, Stephen A., Pani, Silvia, Zioupos, Peter, Swan, Martin, Stone, Corinne, Howlin, Brendan and Hamerton, Ian (2018) ‘Phoenix polymers’: fire induced nanohardness in fibril-forming aromatic cyanate esters RSC Advances, 8 (63). pp. 36264-36271.

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For the first time we present nanoindentation analysis of charred, cured aromatic cyanate esters, which exhibit outstanding mechanical properties when analysed under applied loads of 0.1–300 mN. Following charring (900 C for 10 minutes to achieve graphitised structures), the samples display a remarkable combination of a modulus of elasticity of around 25 GPa and nanohardness of 300 kgf mm2, making them some 30–40% stiffer than bone and practically as hard as tooth enamel. At the same time we find that under the same conditions the chars are highly resilient, displaying complete elastic recovery with very little plastic deformation. When cured in the presence of copper(II) acetylacetonate (200 ppm) in dodecylphenol (1% w/v active copper suspension) to form a polycyanurate, compound (2) forms a dense, consolidated structure compared with compound (1) under the same conditions. At high magnification, the presence of a nanoscale, fibrillar structure is observed, accounting for the high resilience.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
Mooring, Lyndsey
Thompson, Scott
Hall, Stephen A.
Pani, Silvia
Zioupos, Peter
Swan, Martin
Stone, Corinne
Date : 2018
DOI : 10.1039/c8ra07449f
Copyright Disclaimer : Copyright 2018 Royal Society of Chemistry
Depositing User : Melanie Hughes
Date Deposited : 26 Oct 2018 17:46
Last Modified : 26 Oct 2018 17:46

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