Comparative Study on Water Uptake and Ionic Transport Properties of Pre- and Post Sulfonated Chitosan/PVA polymer Exchange Membrane

Chun Yik Wong, Wai Yin Wong, Kee Shyuan Loh, Wan Ramli Wan Daud, Kean Long Lim, Keh Shyuan Loh, Rashmi Walvekar, Mohamad Khalid

Research output: Contribution to journalConference article

Abstract

Chitosan/poly(vinyl alcohol) (PVA) blend composite was prepared through two strategies of chemical modification, namely pre- and post-sulfonation. The sulfonation was carried out by using 4-sulfopthalic acid (sPTA) as the sulfonating agent. The modified chitosan/PVA blend composite was prepared under a range of chitosan content (10:90, 25:75, 50:50, 75:25 and 90:10). Water uptake and ion exchange capacity (IEC) of modified membranes were evaluated by titration and gravimetry methods respectively. Accordingly, both pre- and post-sulfonated composite showed a decrease in water uptakes and IEC values with an increase in chitosan content from 10 to 50 vol.%, attributed to the greater number of hydrogen bond pairs between the two polymers. At 75 vol.%, the composite was predicted to be dominant by the hydrophilic nature of chitosan, in which IEC values and water uptakes were shown to increase. The composite with 90 wt.% chitosan was found to be excessively hydrophilic with tremendously high water uptake, hence not suitable for fuel cell application. Besides that, the post-sulfonated composite showed a trend of increase in the IEC values and water uptakes with a decrease in chitosan content from 10 to 50 vol.%, and bounced back at 75 vol.%. Despite both pre- and post-sulfonation methods demonstrated similar trends in the results, it was notable that post-sulfonation method emerged with higher water uptake and ionic conductivity was found more favorable, attributed to the possibility that sulfonation took place on both PVA and chitosan which has caused a significant increase in sulfonic groups that purportedly exhibited higher ion transport mobility.

Original languageEnglish
Article number012017
JournalIOP Conference Series: Materials Science and Engineering
Volume458
Issue number1
DOIs
Publication statusPublished - 24 Dec 2018
Event5th International Conference on Process Engineering and Advanced Materials, ICPEAM 2018 - Kuala Lumpur, Malaysia
Duration: 13 Aug 201814 Aug 2018

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Chitosan
Sulfonation
Transport properties
Polymers
Membranes
Water
Ion exchange
Composite materials
Gravimetric analysis
Chemical modification
Ionic conductivity
Titration
Fuel cells
Hydrogen bonds
Alcohols
Ions
Acids

Keywords

  • Chitosan/poly(vinyl alcohol) blend composite
  • fuel cell
  • functionalisation of polymers
  • membranes

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Cite this

Comparative Study on Water Uptake and Ionic Transport Properties of Pre- and Post Sulfonated Chitosan/PVA polymer Exchange Membrane. / Wong, Chun Yik; Wong, Wai Yin; Loh, Kee Shyuan; Wan Daud, Wan Ramli; Lim, Kean Long; Loh, Keh Shyuan; Walvekar, Rashmi; Khalid, Mohamad.

In: IOP Conference Series: Materials Science and Engineering, Vol. 458, No. 1, 012017, 24.12.2018.

Research output: Contribution to journalConference article

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abstract = "Chitosan/poly(vinyl alcohol) (PVA) blend composite was prepared through two strategies of chemical modification, namely pre- and post-sulfonation. The sulfonation was carried out by using 4-sulfopthalic acid (sPTA) as the sulfonating agent. The modified chitosan/PVA blend composite was prepared under a range of chitosan content (10:90, 25:75, 50:50, 75:25 and 90:10). Water uptake and ion exchange capacity (IEC) of modified membranes were evaluated by titration and gravimetry methods respectively. Accordingly, both pre- and post-sulfonated composite showed a decrease in water uptakes and IEC values with an increase in chitosan content from 10 to 50 vol.{\%}, attributed to the greater number of hydrogen bond pairs between the two polymers. At 75 vol.{\%}, the composite was predicted to be dominant by the hydrophilic nature of chitosan, in which IEC values and water uptakes were shown to increase. The composite with 90 wt.{\%} chitosan was found to be excessively hydrophilic with tremendously high water uptake, hence not suitable for fuel cell application. Besides that, the post-sulfonated composite showed a trend of increase in the IEC values and water uptakes with a decrease in chitosan content from 10 to 50 vol.{\%}, and bounced back at 75 vol.{\%}. Despite both pre- and post-sulfonation methods demonstrated similar trends in the results, it was notable that post-sulfonation method emerged with higher water uptake and ionic conductivity was found more favorable, attributed to the possibility that sulfonation took place on both PVA and chitosan which has caused a significant increase in sulfonic groups that purportedly exhibited higher ion transport mobility.",
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AU - Wong, Wai Yin

AU - Loh, Kee Shyuan

AU - Wan Daud, Wan Ramli

AU - Lim, Kean Long

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AU - Khalid, Mohamad

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AB - Chitosan/poly(vinyl alcohol) (PVA) blend composite was prepared through two strategies of chemical modification, namely pre- and post-sulfonation. The sulfonation was carried out by using 4-sulfopthalic acid (sPTA) as the sulfonating agent. The modified chitosan/PVA blend composite was prepared under a range of chitosan content (10:90, 25:75, 50:50, 75:25 and 90:10). Water uptake and ion exchange capacity (IEC) of modified membranes were evaluated by titration and gravimetry methods respectively. Accordingly, both pre- and post-sulfonated composite showed a decrease in water uptakes and IEC values with an increase in chitosan content from 10 to 50 vol.%, attributed to the greater number of hydrogen bond pairs between the two polymers. At 75 vol.%, the composite was predicted to be dominant by the hydrophilic nature of chitosan, in which IEC values and water uptakes were shown to increase. The composite with 90 wt.% chitosan was found to be excessively hydrophilic with tremendously high water uptake, hence not suitable for fuel cell application. Besides that, the post-sulfonated composite showed a trend of increase in the IEC values and water uptakes with a decrease in chitosan content from 10 to 50 vol.%, and bounced back at 75 vol.%. Despite both pre- and post-sulfonation methods demonstrated similar trends in the results, it was notable that post-sulfonation method emerged with higher water uptake and ionic conductivity was found more favorable, attributed to the possibility that sulfonation took place on both PVA and chitosan which has caused a significant increase in sulfonic groups that purportedly exhibited higher ion transport mobility.

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