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.
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Keywords
Polyurethane-Modified Epoxy , Nanosilica Filled Composites
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