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Toughening of a carbon fibre reinforced epoxy anhydride composite using an epoxy terminated hyperbranched modifier
journal contribution
posted on 2005-11-01, 00:00 authored by M DeCarli, K Kozielski, W Tian, Russell VarleyRussell VarleyAn epoxy terminated hyperbranched polymer (HBP) has been used to toughen a carbon fibre reinforced epoxy anhydride composite. This report describes the changes in viscoelastic properties used to measure the effect of HBP upon the reaction kinetics, viscosity and phase separation process occurring during cure. An appropriate cure profile was determined to ensure an optimum morphology development during fabrication of the composite containing varying amounts of HBP. The increases in the mode I and II interlaminar fracture toughness of the composite material were found to be 224% and 265%, respectively, at a loading of 10 wt% of HBP additive. Other properties such as interlaminar shear strength, flexural modulus and strength were found to decrease modestly while the glass transition, thermal stability (measured via thermogravimetric analysis) and the transverse coefficient of thermal expansion were largely unaffected. The substantial increase in toughness was attributed to the high level of interaction between the HBP and epoxy anhydride matrix measured from the varying positions of the α relaxation peaks using dynamic mechanical thermal analysis.
History
Journal
Composites science and technologyVolume
65Issue
14Pagination
2156 - 2166Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0266-3538Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2005, ElsevierUsage metrics
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