Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Insolubilization of Water-Soluble Sodium Alginate by Ionic Crosslinking and Redissolution Thereof in Aqueous Salt Solutions

이온 가교에 의한 수용성 알긴산나트륨의 경화와 염 수용액에 의한 이의 재용해에 관한 연구

  • Lee, Seung Han (Department of Materials Design Engineering, Kumoh National Institute of Technology) ;
  • Lee, Ji Heon (Department of Materials Design Engineering, Kumoh National Institute of Technology) ;
  • Chae, Ha Neul (Department of Materials Design Engineering, Kumoh National Institute of Technology) ;
  • Min, Byung Gil (Department of Materials Design Engineering, Kumoh National Institute of Technology)
  • 이승한 (금오공과대학교 소재디자인공학과) ;
  • 이지헌 (금오공과대학교 소재디자인공학과) ;
  • 채하늘 (금오공과대학교 소재디자인공학과) ;
  • 민병길 (금오공과대학교 소재디자인공학과)
  • Received : 2021.03.15
  • Accepted : 2021.04.06
  • Published : 2021.04.30
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Abstract

In this work, the insolubilization of water-soluble sodium alginate, which is a representative biomass natural polymer, was investigated for various purposes, including coatings on paper cups. It was observed that sodium alginate could be insolubilized well in calcium chloride by formation of ionic crosslinks through replacement of Na+ ions with Ca2+ ions on a block of L-guluronic acid of alginate to form calcium alginate. Water-insolubilization of alginate is a critical prerequisite for the coatings on cups to retain water. However, the calcium alginate coating needs to undergo re-dissolution in water to enable recycling of the paper cups after use. It was observed that calcium alginate could be easily re-dissolved in a specific aqueous salt solution containing disodium phosphate (Na2HPO4). The re-dissolution of calcium alginate was confirmed by scanning electron microscopy and energy-dispersive X-ray spectroscopy (EDS). The process developed in this study is expected to be used for various eco-friendly applications without the need to use organic solvents.

Keywords

Acknowledgement

본 연구는 금오공과대학교 학술연구비로 지원된 것임(2020-0224-0001).

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