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Ultraviolet-induced free radical reactions in ENR50/alkyd blend leading to significant increase in cross-linking

In this work, the potential of palm stearin alkyd as a cross-linking agent for rubber compounding was investigated. Alkyd carrying pendent –COOH groups was blended with epoxidised natural rubber (ENR50) via solvent casting technique at ambient temperature. Spectroscopic characterisations show that...

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Main Authors: Yoke, K.K., Desmond, T.C.A., Seng, N.G.
Format: Article
Language:English
Published: SAGE Publications 2014
Subjects:
QD Chemistry
Online Access:http://eprints.um.edu.my/10045/1/00003991_104854.pdf
http://eprints.um.edu.my/10045/
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spelling my.um.eprints.100452014-12-11T09:01:58Z http://eprints.um.edu.my/10045/ Ultraviolet-induced free radical reactions in ENR50/alkyd blend leading to significant increase in cross-linking Yoke, K.K. Desmond, T.C.A. Seng, N.G. QD Chemistry In this work, the potential of palm stearin alkyd as a cross-linking agent for rubber compounding was investigated. Alkyd carrying pendent –COOH groups was blended with epoxidised natural rubber (ENR50) via solvent casting technique at ambient temperature. Spectroscopic characterisations show that ENR50 and alkyd have interacted with each other via chemical reaction involving the epoxide of the rubber and –COOH of alkyd. Consequently, notable increase in the glass transition temperature (Tg) and gel content of the blend was observed. In addition to the epoxide ring-opening reaction, the extent of cross-linking in the blend was further increased by means of ultraviolet (UV) curing. As a result, the UV-cured blends experienced lower percentage of swelling, produced higher percentage of gel, have higher cross-link density and higher Tg. The cross-link density in the rubber/alkyd blend has increased from 3.0 � 10�6 mol cm�3 to 2.0 � 10�4 mol cm�3 after UV curing. This is clearly evidenced from the swelling test results, where ENR and alkyd are completely soluble in the solvent, but upon blending and subsequent UV irradiation,the blend produced >90% of gel and swelled by 318%. Findings from this work show that sustainable material such as vegetable oil could be utilised in development of cross-linking agent for rubber. Significant increase in the cross-link density of the UVcured blend suggests that environment friendly compound such as alkyd has great potential to serve as an alternative to conventional compounds in rubber vulcanisation. SAGE Publications 2014 Article PeerReviewed application/pdf en http://eprints.um.edu.my/10045/1/00003991_104854.pdf Yoke, K.K. and Desmond, T.C.A. and Seng, N.G. (2014) Ultraviolet-induced free radical reactions in ENR50/alkyd blend leading to significant increase in cross-linking. Journal of Elastomers and Plastics. pp. 1-16. ISSN 0095-2443
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
language English
topic QD Chemistry
spellingShingle QD Chemistry
Yoke, K.K.
Desmond, T.C.A.
Seng, N.G.
Ultraviolet-induced free radical reactions in ENR50/alkyd blend leading to significant increase in cross-linking
description In this work, the potential of palm stearin alkyd as a cross-linking agent for rubber compounding was investigated. Alkyd carrying pendent –COOH groups was blended with epoxidised natural rubber (ENR50) via solvent casting technique at ambient temperature. Spectroscopic characterisations show that ENR50 and alkyd have interacted with each other via chemical reaction involving the epoxide of the rubber and –COOH of alkyd. Consequently, notable increase in the glass transition temperature (Tg) and gel content of the blend was observed. In addition to the epoxide ring-opening reaction, the extent of cross-linking in the blend was further increased by means of ultraviolet (UV) curing. As a result, the UV-cured blends experienced lower percentage of swelling, produced higher percentage of gel, have higher cross-link density and higher Tg. The cross-link density in the rubber/alkyd blend has increased from 3.0 � 10�6 mol cm�3 to 2.0 � 10�4 mol cm�3 after UV curing. This is clearly evidenced from the swelling test results, where ENR and alkyd are completely soluble in the solvent, but upon blending and subsequent UV irradiation,the blend produced >90% of gel and swelled by 318%. Findings from this work show that sustainable material such as vegetable oil could be utilised in development of cross-linking agent for rubber. Significant increase in the cross-link density of the UVcured blend suggests that environment friendly compound such as alkyd has great potential to serve as an alternative to conventional compounds in rubber vulcanisation.
format Article
author Yoke, K.K.
Desmond, T.C.A.
Seng, N.G.
author_facet Yoke, K.K.
Desmond, T.C.A.
Seng, N.G.
author_sort Yoke, K.K.
title Ultraviolet-induced free radical reactions in ENR50/alkyd blend leading to significant increase in cross-linking
title_short Ultraviolet-induced free radical reactions in ENR50/alkyd blend leading to significant increase in cross-linking
title_full Ultraviolet-induced free radical reactions in ENR50/alkyd blend leading to significant increase in cross-linking
title_fullStr Ultraviolet-induced free radical reactions in ENR50/alkyd blend leading to significant increase in cross-linking
title_full_unstemmed Ultraviolet-induced free radical reactions in ENR50/alkyd blend leading to significant increase in cross-linking
title_sort ultraviolet-induced free radical reactions in enr50/alkyd blend leading to significant increase in cross-linking
publisher SAGE Publications
publishDate 2014
url http://eprints.um.edu.my/10045/1/00003991_104854.pdf
http://eprints.um.edu.my/10045/
_version_ 1643688691577651200
score 13.211869

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