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Volume 12, Issue 2, 2003 THE
EFFECT OF A STARCH ENVELOPE ON FLY ASH PARTICLES ON THE IMPACT PROPERTIES OF
FILLED EPOXY COMP0SITES (Received 6/02; accepted 4/03) * Author
to whom correspondence should be addressed
The impact behaviour of epoxy specimens containing 20% by volume of fly ash particles without (coded, FA20) and with surface enveloped by starch in dry (FAS20) and water-ingresses (FASM20) conditions is studied. The resulting behavioural patterns are documented and compared to the composites containing as received fly ash particles. The data on unreinforced (i.e. neat) epoxy system (designated, NE) are also included. Samples with starch covering for the fillers whether tested in dry or wet conditions (i.e. FAS20 & FASM20) showed greater absorption of energy and maximum load compared to the ones derived on composites having as received fillers tested in unexposed (dry) condition (FA20). Ductility Index, D.I. on the other hand, showed a reversal in trends; the energy absorbed was highest for NE and lowest FA20 samples. Scanning microscopic examination of the fracture features was undertaken to correlate the microstructure to impact response. Keywords: epoxy, fly ash, filler, starch, impact, ductility index |
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