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Dramatic reductions in water uptake observed in novel POSS nanocomposites based on anhydride-cured epoxy matrix resins

Hamerton, I, Tang, W, Anguita, JV and Silva, SRP (2015) Dramatic reductions in water uptake observed in novel POSS nanocomposites based on anhydride-cured epoxy matrix resins Materials Today Communications, 4. pp. 186-198.

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Abstract

© 2015.A methylnadic anhydride-cured diglycidylether of bisphenol A, is prepared and characterised and a mono-epoxy POSS reagent added (0.5-4wt-%) to produce a series of nanocomposites. Two reaction mechanisms are observed involving esterification at lower temperatures (60-180°C) and etherification at temperatures above 180°C. Using the Ozawa and Kissinger methods, the activation energy for the first reaction was found to be 87-90kJ/mol and 122-124kJ/mol for the second reaction. Incorporation of POSS into the epoxy-anhydride network increases the Tg and cross-link density, indicating a more rigid network, but the values do not follow a trend based solely on POSS content. The char yield increases with POSS content with very little change in the degradation temperature. Incorporation of POSS (1wt-%) can reduce the moisture uptake in the cured resin by ~25% at 75% relative humidity. This is accompanied by a lower impact on glass transition temperature: the Tg is reduced by 10K at saturation, compared with 31K for the unmodified epoxy.

Item Type: Article
Authors :
NameEmailORCID
Hamerton, Ii.hamerton@surrey.ac.ukUNSPECIFIED
Tang, WUNSPECIFIEDUNSPECIFIED
Anguita, JVj.anguita@surrey.ac.ukUNSPECIFIED
Silva, SRPs.silva@surrey.ac.ukUNSPECIFIED
Date : 1 September 2015
Identification Number : https://doi.org/10.1016/j.mtcomm.2015.07.001
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:43
Last Modified : 17 May 2017 15:12
URI: http://epubs.surrey.ac.uk/id/eprint/840183

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