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Effects of process parameters on selected properties of liquid compression-molded vinyl ester sheets

Vinyl esters combine the best of polyesters and epoxies in terms of properties and processing. Without complicating presence of reinforcing fibres, this study investigated the effects of catalyst amount, preheating time, molding temperature, and pressure on flexural and water absorption properties o...

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Main Authors: Abd. Rahman, Mohamed, Salit, Mohd. Sapuan, Abdan, Khalina
Format: Article
Language:English
Published: Universiti Putra Malaysia Press 2011
Subjects:
TS Manufactures
Online Access:http://irep.iium.edu.my/7294/1/PERTANIKA_2011.pdf
http://irep.iium.edu.my/7294/
http://www.pertanika.upm.edu.my/index%20-%20JST.htm
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spelling my.iium.irep.72942011-11-21T14:15:17Z http://irep.iium.edu.my/7294/ Effects of process parameters on selected properties of liquid compression-molded vinyl ester sheets Abd. Rahman, Mohamed Salit, Mohd. Sapuan Abdan, Khalina TS Manufactures Vinyl esters combine the best of polyesters and epoxies in terms of properties and processing. Without complicating presence of reinforcing fibres, this study investigated the effects of catalyst amount, preheating time, molding temperature, and pressure on flexural and water absorption properties of cast vinyl ester (VE) using a factorial experiment. Longer preheating time enhanced the stiffness of VE, while higher molding pressure reduced the flexural modulus. All the four factors did not affect the flexural strength and elongation at the break of molded VE significantly. Using a high molding pressure also caused molded VE to have higher water absorption for a long water exposure period. Meanwhile, greater water absorption at bigger amount of catalyst and higher preheating temperature indicate possible interactions between these factors. The results suggest possible negative effects of high molding pressure through the increase in the network of micro-cracks, and thus lowering the integrity of cast VE sheets. Judicious selection of the process parameters was required in order to obtain good quality molded VE sheets and by extension fibre-reinforced VE composites. Molded VE-unsaturated polyester (UP) blend is a significantly different material which is 1.49 times stronger, 2.38 times more flexible, but it is 0.69 less stiff than neat VE and with significantly higher water absorption. The results obtained warrant for a further investigation in process optimization of VE molding and the use of VE-UP blend as a matrix for natural fibre-reinforced composites. Universiti Putra Malaysia Press 2011 Article REM application/pdf en http://irep.iium.edu.my/7294/1/PERTANIKA_2011.pdf Abd. Rahman, Mohamed and Salit, Mohd. Sapuan and Abdan, Khalina (2011) Effects of process parameters on selected properties of liquid compression-molded vinyl ester sheets. Pertanika Journal of Science and Technology, 19 (1). pp. 137-142. ISSN 0128-7680 http://www.pertanika.upm.edu.my/index%20-%20JST.htm
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
topic TS Manufactures
spellingShingle TS Manufactures
Abd. Rahman, Mohamed
Salit, Mohd. Sapuan
Abdan, Khalina
Effects of process parameters on selected properties of liquid compression-molded vinyl ester sheets
description Vinyl esters combine the best of polyesters and epoxies in terms of properties and processing. Without complicating presence of reinforcing fibres, this study investigated the effects of catalyst amount, preheating time, molding temperature, and pressure on flexural and water absorption properties of cast vinyl ester (VE) using a factorial experiment. Longer preheating time enhanced the stiffness of VE, while higher molding pressure reduced the flexural modulus. All the four factors did not affect the flexural strength and elongation at the break of molded VE significantly. Using a high molding pressure also caused molded VE to have higher water absorption for a long water exposure period. Meanwhile, greater water absorption at bigger amount of catalyst and higher preheating temperature indicate possible interactions between these factors. The results suggest possible negative effects of high molding pressure through the increase in the network of micro-cracks, and thus lowering the integrity of cast VE sheets. Judicious selection of the process parameters was required in order to obtain good quality molded VE sheets and by extension fibre-reinforced VE composites. Molded VE-unsaturated polyester (UP) blend is a significantly different material which is 1.49 times stronger, 2.38 times more flexible, but it is 0.69 less stiff than neat VE and with significantly higher water absorption. The results obtained warrant for a further investigation in process optimization of VE molding and the use of VE-UP blend as a matrix for natural fibre-reinforced composites.
format Article
author Abd. Rahman, Mohamed
Salit, Mohd. Sapuan
Abdan, Khalina
author_facet Abd. Rahman, Mohamed
Salit, Mohd. Sapuan
Abdan, Khalina
author_sort Abd. Rahman, Mohamed
title Effects of process parameters on selected properties of liquid compression-molded vinyl ester sheets
title_short Effects of process parameters on selected properties of liquid compression-molded vinyl ester sheets
title_full Effects of process parameters on selected properties of liquid compression-molded vinyl ester sheets
title_fullStr Effects of process parameters on selected properties of liquid compression-molded vinyl ester sheets
title_full_unstemmed Effects of process parameters on selected properties of liquid compression-molded vinyl ester sheets
title_sort effects of process parameters on selected properties of liquid compression-molded vinyl ester sheets
publisher Universiti Putra Malaysia Press
publishDate 2011
url http://irep.iium.edu.my/7294/1/PERTANIKA_2011.pdf
http://irep.iium.edu.my/7294/
http://www.pertanika.upm.edu.my/index%20-%20JST.htm
_version_ 1643605909442658304
score 13.211869

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