A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites

Kajian ini adalah mengenai pengubahsuaian kimia ke atas resin epoksi menggunakan prabahan-poliuretana (prabahan-PU) yang beraneka panjang rantai dan kearomatikan. Prabahan-PU dengan nisbah diol-diisosianat 1:3 adalah optima untuk penambahan secara kimia ke dalam epoksi. Kajian ini berbeza daripad...

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Main Author:	Shereen , Ong Joo Suan
Format:	Thesis
Language:	English
Published:	2009
Subjects:	QD1-999 Chemistry
Online Access:	http://eprints.usm.my/41597/1/Shereen_Ong_Joo_Suan24.pdf
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spelling	my-usm-ep.415972019-04-12T05:27:00Z A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites 2009-11 Shereen , Ong Joo Suan QD1-999 Chemistry Kajian ini adalah mengenai pengubahsuaian kimia ke atas resin epoksi menggunakan prabahan-poliuretana (prabahan-PU) yang beraneka panjang rantai dan kearomatikan. Prabahan-PU dengan nisbah diol-diisosianat 1:3 adalah optima untuk penambahan secara kimia ke dalam epoksi. Kajian ini berbeza daripada kajian lain yang sedia ada dari segi penambahan kimia PU serta penggunaan PU yang berberat molekul, dan darjah pempolimeran rendah. Faktor-faktor pembezaan tersebut telah menyumbang kepada keelakan masalah-masalah pemisahan fasa, pengurangan suhu peralihan kaca (Tg) dan kestabilan terma yang lazim berlaku. Namun, penggunaan kaedah kemasukan secara kimia telah menghadkan kuantiti PU yang boleh ditambah kepada kurang daripada 6 phr. 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. 2009-11 Thesis http://eprints.usm.my/41597/ http://eprints.usm.my/41597/1/Shereen_Ong_Joo_Suan24.pdf application/pdf en public phd doctoral Universiti Sains Malaysia Pusat Pengajian Sains Kimia
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	QD1-999 Chemistry
spellingShingle	QD1-999 Chemistry Shereen , Ong Joo Suan A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites
description	Kajian ini adalah mengenai pengubahsuaian kimia ke atas resin epoksi menggunakan prabahan-poliuretana (prabahan-PU) yang beraneka panjang rantai dan kearomatikan. Prabahan-PU dengan nisbah diol-diisosianat 1:3 adalah optima untuk penambahan secara kimia ke dalam epoksi. Kajian ini berbeza daripada kajian lain yang sedia ada dari segi penambahan kimia PU serta penggunaan PU yang berberat molekul, dan darjah pempolimeran rendah. Faktor-faktor pembezaan tersebut telah menyumbang kepada keelakan masalah-masalah pemisahan fasa, pengurangan suhu peralihan kaca (Tg) dan kestabilan terma yang lazim berlaku. Namun, penggunaan kaedah kemasukan secara kimia telah menghadkan kuantiti PU yang boleh ditambah kepada kurang daripada 6 phr. 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.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Shereen , Ong Joo Suan
author_facet	Shereen , Ong Joo Suan
author_sort	Shereen , Ong Joo Suan
title	A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites
title_short	A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites
title_full	A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites
title_fullStr	A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites
title_full_unstemmed	A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites
title_sort	study of polyurethane-modified epoxy and its nanosilica filled composites
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Sains Kimia
publishDate	2009
url	http://eprints.usm.my/41597/1/Shereen_Ong_Joo_Suan24.pdf
_version_	1747820936296398848

A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites

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