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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| Format: | Thesis |
| Language: | English |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://eprints.usm.my/41597/1/Shereen_Ong_Joo_Suan24.pdf |
| _version_ | 1797010661524373504 |
|---|---|
| author | Shereen , Ong Joo Suan |
| author_facet | Shereen , Ong Joo Suan |
| author_sort | Shereen , Ong Joo Suan |
| collection | USM |
| 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. |
| first_indexed | 2024-03-06T15:23:03Z |
| format | Thesis |
| id | usm.eprints-41597 |
| institution | Universiti Sains Malaysia |
| language | English |
| last_indexed | 2024-03-06T15:23:03Z |
| publishDate | 2009 |
| record_format | dspace |
| spelling | usm.eprints-415972019-04-12T05:27:00Z http://eprints.usm.my/41597/ A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites 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 NonPeerReviewed application/pdf en http://eprints.usm.my/41597/1/Shereen_Ong_Joo_Suan24.pdf Shereen , Ong Joo Suan (2009) A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites. PhD thesis, Universiti Sains Malaysia. |
| spellingShingle | QD1-999 Chemistry Shereen , Ong Joo Suan A Study Of Polyurethane-Modified Epoxy And Its Nanosilica Filled Composites |
| title | 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_short | A Study Of Polyurethane-Modified Epoxy
And Its Nanosilica Filled Composites
|
| title_sort | study of polyurethane modified epoxy and its nanosilica filled composites |
| topic | QD1-999 Chemistry |
| url | http://eprints.usm.my/41597/1/Shereen_Ong_Joo_Suan24.pdf |
| work_keys_str_mv | AT shereenongjoosuan astudyofpolyurethanemodifiedepoxyanditsnanosilicafilledcomposites AT shereenongjoosuan studyofpolyurethanemodifiedepoxyanditsnanosilicafilledcomposites |