Insights into the physical properties of biobased polyurethane/expanded graphite composite foams
authors Gama, N; Costa, LC; Amaral, V; Ferreira, A; Barros-Timmons, A
nationality International
journal COMPOSITES SCIENCE AND TECHNOLOGY
author keywords Polyurethane foams; Expanded graphite; Thermal conductivity; DC electrical conductivity
keywords FREE FLAME-RETARDANT; EXPANDED GRAPHITE; CARBON NANOTUBES; NANOCOMPOSITES; BEHAVIOR; ENHANCEMENT; PERFORMANCE
abstract The main purpose of this work was to widen the range of applications of the polyurethane foams (PUFs) obtained from renewable resources as higher added value materials by increasing their electrical and thermal conductivities and get a better insight of the parameters governing these properties. The increase of these properties is frequently achieved by filling PUFs with carbon nanofibers (CNFs), carbon nanotubes (CNTs) or graphene layers, however their cost limits their widespread use. In this work, an inexpensive procedure has been developed to prepare electrical conductive PUFs using castor oil (CO) as polyol and expanded graphite (EG). The chemical and structural characteristics of the ensuing composite foams have been evaluated, as well as their morphology and their mechanical, thermal and electrical properties. The DC electrical conductivity results have been fitted to Taherian model. EG loadings between 0.5 and 1.5% (w/w) caused a systematic increase of the thermal and electrical conductivities Moreover, in this fillers' loading range the remaining physical properties namely the glass transition temperature and the Young's modulus are appropriate for standard applications. (C) 2016 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0266-3538
isbn 1879-1050
year published 2017
volume 138
beginning page 24
ending page 31
digital object identifier (doi) 10.1016/j.compscitech.2016.11.007
web of science category Materials Science, Composites
subject category Materials Science
unique article identifier WOS:000392778500004

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