Article
  • Effect of Domain Size of n-Octadecane Phase Change Material In situ Shape-Stabilized in Alginate Matrix on Efficiency of Latent Heat
  • Seung Han Lee , Haneul Chae, and Byung Gil Min

  • Department of Materials Design Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea

  • 알긴산 매트릭스에 동시형태고정화된 상전이물질 옥타데칸의 분산상 크기가 용융잠열에 미치는 영향
  • 이승한 · 채하늘 · 민병길

  • Reproduction, stored in a retrieval system, or transmitted in any form of any part of this publication is permitted only by written permission from the Polymer Society of Korea.

Abstract

It was investigated to prepare composite films where n-octadecane as a phase change material was in situ shape-stabilized in alginate matrix through O/W emulsion formed by ultrasonication or high-speed stirring. The micelle size of n-octadecane in the emulsion could be controlled by less than 10 μm. It was also found that the ultrasonication process is more effective for smaller micelle sizes than the high-speed stirring process. The micelle size of n-octadecane was confirmed to be maintained in the hybrid solution with sodium alginate resin. Alginate/n-octadecane composite films were obtained by coagulation and insolubilization in an aqueous solution of calcium chloride. It was notable that the heat of melting of the composite was much lower that the same amount of pristine n-octadecane. This phenomenon was concluded to be resulted from the higher specific surface area of n-octadecane with smaller domain size in the composites, where n-octadecane molecules located near the surface behave with lower crystallinity and perfectness.


용융잠열이 매우 큰 상전이물질인 옥타데칸을 O/W 에멀젼 형성 공정을 통하여 알긴산 수지에 동시형태고정화시키는 연구를 수행하였다. 에멀젼 공정을 통하여 옥타데칸 마이셀의 크기를 10 μm 이하로 조절하는 것이 가능하였으며, 초음파 처리법이 고속교반법에 비하여 옥타데칸 마이셀의 크기가 훨씬 작게 조절되는 결과를 얻었다. 에멀젼의 옥타데칸 마이셀의 크기는 알긴산 수지를 용해시킨 하이브리드 용액에서도 동일한 크기의 분산상으로 유지되는 것으로 나타났다. 하이브리드 복합액을 필름 캐스팅하고 염화칼슘 수용액에서 응고 및 불용화시켜 복합필름을 제조할 수 있었다. 복합필름의 용융잠열이 순수 알긴산의 용융잠열에 비하여 30-60%로 낮게 나타났는데, 용융잠열은 형태고정화된 옥타데칸 분산상의 크기에 비례한다는 결과를 얻었다. 이는 옥타데칸 분산상의 크기가 작을수록 비표면적이 커지게 되어 표면에 존재하는 분자의 비율이 높아짐에 따라 결정화도가 낮아지고 결정의 완전성도 저하됨에 기인하는 것으로 결론지을 수 있었다.


Keywords: phase change materials, n-octadecane, shape-stabilization, alginate, ultrasonication.

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2022; 46(4): 506-514

    Published online Jul 25, 2022

  • 10.7317/pk.2022.46.4.506
  • Received on Mar 31, 2022
  • Revised on Apr 26, 2022
  • Accepted on May 3, 2022

Correspondence to

  • Byung Gil Min
  • Department of Materials Design Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea

  • E-mail: bgmin@kumoh.ac.kr