Original Article
  • Preparation of Polyimide-coated Polyurethane foam for Improved Flame Retardancy
  • Haeun Shin*, Ho-Bin Seo*, Hyeon-Woo Park*, Nam-Ho You*†

  • * Carbon Composite Materials Research Center, Korea Institute of Science and Technology (KIST), Wanju 55324, Republic of Korea

  • 난연성 향상을 위한 폴리이미드 코팅 폴리우레탄 폼의 제조
  • 신하은* · 서호빈* · 박현우* · 유남호*†

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

CO2-based polymerization research and industries are attracting attention as one method of utilizing CO2 to alleviate the acceleration of the climate crisis caused by increasing CO2 emissions. Polyurethane foams (PUFs) were prepared using CO2-based polycarbonate and polyimide (PI) was coated on the surface through an easy and simple aqueous solution dip coating method. High compressive strength of up to 773.2 kPa at 70% compressive strain was exhibited attributed to the rigid PI coating on the surface of the PUFs, resulting in a significant increase in mechanical strength. The PI-coated PUF exhibited improved thermal stability and the limited oxygen index (LOI) of 26.0%. The phosphorus contained in the PUFs and the PI coatings had influenced the formation of a protective char layer in the condensed phase and reduction of gaseous combustibles, resulting in a 31% reduction in total heat release (THR) as a result of combustion tests using a microscale combustion calorimeter (MCC).


증가하는 CO2 배출량에 따른 기후위기의 가속화를 완화시키기 위한 CO2를 활용 방안 중 하나로 CO2 기반 고분자 중합 연구 및 산업이 주목받고 있다. 본 연구에서는 CO2 기반 폴리카보네이트를 사용하여 폴리우레탄 폼(PUF)을 제조하고, 폴리이미드(PI)를 쉽고 간단한 수용액 딥 코팅법을 통해 표면에 코팅하였다. PUF 표면에 강성 PI 코팅을 적용하여 70% 압축 변형률에서 최대 773.2 kPa의 높은 압축 강도를 나타내어 기계적 강도가 크게 향상되었다. PI 코팅된 PUF는 향상된 열 안정성과 26.0%의 한계 산소 지수(LOI)를 나타냈다. PUF와 PI 코팅에 함유된 인은 응축 단계에서 보호 숯층 형성과 기체 가연물의 감소에 영향을 미쳐, 미세 연소 열량계(MCC)를 이용한 연소 시험 결과 총 열 방출량(THR)이 31% 감소하였다.


Keywords: 폴리우레탄 폼(Polyurethane foam), 폴리이미드(Polyimide), 난연성(Flame retardancy)

This Article

Correspondence to

  • Nam-Ho You
  • Carbon Composite Materials Research Center, Korea Institute of Science and Technology (KIST), Wanju 55324, Republic of Korea

  • E-mail: polymer@kist.re.kr