Article
  • Fabrication of Transmittance Tunable Porous Elastomers for Smart Window Applications
  • Mira Shin# , Youngeun Lee# , Jinkyung Kim# , Gun Woo Sim# , Youngho Eom, Se-Um Kim*,† , and Dae Seok Kim

  • Pukyong National University, Department of Polymer Engineering, 45 Yongso-ro, Nam-gu, Busan 48513, Korea
    *Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104, USA

  • 스마트 윈도우 응용을 위한 광 투과 조절 가능 다공성 엘라스토머 제작
  • 신미라# · 이영은# · 김진경# · 심건우# · 엄영호 · 김세움*,† · 김대석

  • 부경대학교 고분자공학과, *펜실베니아대학교 재료공학과

  • 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

In this study, we propose a smart window application based on a porous silicone elastomer film that can control light transmittance by compression. A porous elastomeric film was produced by emulsification of isopropyl alcohol aqueous solution in a platinum-catalyzed silicone known as an Ecoflex. It was shown that pores with a size of several hundred nanometers to several tens of micrometers induce light-scattering in the visible light region due to the difference in refractive index with the Ecoflex matrix, and the transmittance could be controlled as the pores were closed by applying compression on the film thickness. It was confirmed that the transmittance can be reversibly adjusted with a fast reaction rate of less than 1 second, and the deterioration is very small even in repeated driving. Furthermore, for smart window application, a press-type window with a porous Ecoflex film was demonstrated. The fabrication process is very simple and economically preferred, and it can be applied as a base technology for an energy-saving smart window that can maintain indoor temperature and illumination without electrical energy.


연구에서는 압착을 통해 투과도 조절이 가능한 다공성 실리콘 엘라스토머 필름을 제작하고 이를 기반으로 한 스마트 윈도우 응용을 제안한다. Isopropyl alcohol 수용액이 Ecoflex 전구체와 상분리가 되는 것을 이용해 Ecoflex 몸체에 다공성 구조를 가진 필름을 제작하였다. 수백 nm에서 수십 mm 크기의 기공이 Ecoflex 몸체와 굴절률 차이로 가시광 영역에서 산란을 일으키고 필름 압착 시 기공이 닫히면서 투과도 조절이 가능함을 보였다. 광 투과도를 가역적으로, 1초 이하의 빠른 반응속도로 조절할 수 있으며 반복 구동에도 열화가 매우 적음을 확인하였다. 나아가 스마트 윈도우 응용을 위해, 다공성 Ecoflex 필름이 삽입된 압착형 창문을 제작하여 응용성을 시연하였다. 이 다공성 Ecoflex 필름의 제작 공정이 매우 단순하며, 실내 온도 및 조도 유지를 전기적 에너지 없이 가능한 에너지 절약형 스마트 윈도우의 기반 기술로 응용될 수 있다.


Keywords: smart window, porous elastomer, light scattering, Ecoflex, tunable transmittance.

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2020 Impact Factor : 0.493
  • Indexed in SCIE

This Article

  • 2021; 45(6): 934-939

    Published online Nov 25, 2021

  • 10.7317/pk.2021.45.6.934
  • Received on Aug 2, 2021
  • Revised on Aug 19, 2021
  • Accepted on Aug 24, 2021

Correspondence to

  • Se-Um Kim* , and Dae Seok Kim
  • Pukyong National University, Department of Polymer Engineering, 45 Yongso-ro, Nam-gu, Busan 48513, Korea
    *Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, PA 19104, USA

  • E-mail: seumkim@sas.upenn.edu, daeseok@pknu.ac.kr