A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites
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Date
2009-11
Authors
Shereen Ong, Joo Suan
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
This study describes the chemical modification of epoxy resin with
polyurethane-precursors (PU-precursors) of varying chain length and aromacity. PUprecursors
with diol-diisocyanate ratio of 1:3 are optimum for a chemical
incorporation into epoxy. Differentiating the present study from other available PUepoxy
systems are the chemically incorporated PU, as well as the use of PU with low
molecular weight (MW) and low degree of polymerization (n). These differentiating
factors have been attributed to the successful aversion of phase separation, reduced
glass transition temperature (Tg) and thermal stability, that has otherwise been
common in PU-incorporated epoxy systems. Nevertheless, confining to chemical
incorporation has limited the incorporated PU quantity to less than 6 phr.
Description
Keywords
Polyurethane-Modified Epoxy , Nanosilica Filled Composites