Staff View: A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites

A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites

In this study, a low-cost thermoset such as unsaturated polyester resin (UPR) was used for the preparation of lightweight and thermal insulation polymer composite using rice husk-derived silica aerogel (SA) as filler. For the first time, hydrophilic and hydrophobic silica aerogel (SA) of similar phy...

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Main Authors:	Abdul Halim, Zulhelmi Alif, Awang, Nuha, Mat Yajid, Muhamad Azizi, Ahmad, Norhayati, Hamdan, Halimaton
Format:	Article
Published:	Springer Science and Business Media Deutschland GmbH 2022
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/103676/ http://dx.doi.org/10.1007/s00289-021-03798-4
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id	my.utm.103676
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spelling	my.utm.1036762023-11-23T08:14:46Z http://eprints.utm.my/103676/ A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites Abdul Halim, Zulhelmi Alif Awang, Nuha Mat Yajid, Muhamad Azizi Ahmad, Norhayati Hamdan, Halimaton TJ Mechanical engineering and machinery In this study, a low-cost thermoset such as unsaturated polyester resin (UPR) was used for the preparation of lightweight and thermal insulation polymer composite using rice husk-derived silica aerogel (SA) as filler. For the first time, hydrophilic and hydrophobic silica aerogel (SA) of similar physical properties were added to the UPR to study the effects of SA surface polarity on the mechanical tensile and thermal properties of the composites. The composites with 40% and 60% of SA filler by volume were prepared via direct mixing and cured at room temperature using methyl ethyl ketone peroxide. The UPR composites were characterized and compared using density measurement, hot-disc thermal conductivity analyzer, universal testing machine, Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis. The results of this study indicate that the filler–matrix interaction appears to be dependent on the type of SA (hydrophobic or hydrophilic), due to noticeable differences in the data values. UPR composites containing hydrophilic SA exhibit lower density and thermal conductivity due to a higher volume of preserved SA pores. Both hydrophobic and hydrophilic SA could increase the tensile stiffness, but composite with hydrophilic SA exhibit higher fracture strain, indicating higher toughness. On the other hand, composites with hydrophobic SA produced stronger hydrogen bonding interaction which increases resin viscosity and led to rougher surface morphology. However, the addition of SA, regardless of surface polarity and volume concentration had little or no effect on thermal stability except that the composite with hydrophobic SA gives a slightly higher char yield. Springer Science and Business Media Deutschland GmbH 2022-08 Article PeerReviewed Abdul Halim, Zulhelmi Alif and Awang, Nuha and Mat Yajid, Muhamad Azizi and Ahmad, Norhayati and Hamdan, Halimaton (2022) A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites. Polymer Bulletin, 79 (8). pp. 6173-6191. ISSN 0170-0839 http://dx.doi.org/10.1007/s00289-021-03798-4 DOI:10.1007/s00289-021-03798-4
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Abdul Halim, Zulhelmi Alif Awang, Nuha Mat Yajid, Muhamad Azizi Ahmad, Norhayati Hamdan, Halimaton A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites
description	In this study, a low-cost thermoset such as unsaturated polyester resin (UPR) was used for the preparation of lightweight and thermal insulation polymer composite using rice husk-derived silica aerogel (SA) as filler. For the first time, hydrophilic and hydrophobic silica aerogel (SA) of similar physical properties were added to the UPR to study the effects of SA surface polarity on the mechanical tensile and thermal properties of the composites. The composites with 40% and 60% of SA filler by volume were prepared via direct mixing and cured at room temperature using methyl ethyl ketone peroxide. The UPR composites were characterized and compared using density measurement, hot-disc thermal conductivity analyzer, universal testing machine, Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis. The results of this study indicate that the filler–matrix interaction appears to be dependent on the type of SA (hydrophobic or hydrophilic), due to noticeable differences in the data values. UPR composites containing hydrophilic SA exhibit lower density and thermal conductivity due to a higher volume of preserved SA pores. Both hydrophobic and hydrophilic SA could increase the tensile stiffness, but composite with hydrophilic SA exhibit higher fracture strain, indicating higher toughness. On the other hand, composites with hydrophobic SA produced stronger hydrogen bonding interaction which increases resin viscosity and led to rougher surface morphology. However, the addition of SA, regardless of surface polarity and volume concentration had little or no effect on thermal stability except that the composite with hydrophobic SA gives a slightly higher char yield.
format	Article
author	Abdul Halim, Zulhelmi Alif Awang, Nuha Mat Yajid, Muhamad Azizi Ahmad, Norhayati Hamdan, Halimaton
author_facet	Abdul Halim, Zulhelmi Alif Awang, Nuha Mat Yajid, Muhamad Azizi Ahmad, Norhayati Hamdan, Halimaton
author_sort	Abdul Halim, Zulhelmi Alif
title	A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites
title_short	A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites
title_full	A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites
title_fullStr	A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites
title_full_unstemmed	A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites
title_sort	comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites
publisher	Springer Science and Business Media Deutschland GmbH
publishDate	2022
url	http://eprints.utm.my/103676/ http://dx.doi.org/10.1007/s00289-021-03798-4
_version_	1783876399359066112
score	13.211869

A comparison between the effects of hydrophobic and hydrophilic silica aerogel fillers on tensile and thermal properties of unsaturated polyester composites

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