Article
  • Epoxy Planarization Films for the Stainless Steel Substrates for Flexible Displays
  • Hong Y, Jung S, Choi J
  • 플렉시블 디스플레이용 Stainless Steel 기판의 에폭시 평탄막 연구
  • 홍용택, 정승준, 최지원
Abstract
This paper reports the first results of a series of planarization film study for the stainless steel (SS) substrates for flexible displays. Diglycidyl ether of bisphenol A (DGEBA) and octa(dimethylsiloxypropylglycidylether) silsesquioxane (OG) were chosen for the organic and the hybrid epoxies respectively and diaminodiphenylmethane (DDM) was used as a curing agent at 1:2 stoichiometric ratio. These materials were spin-coated on SS substrates and thermal-cured. TGA study indicated that both the pristine and the cured OG were more thermally stable than DGEBA. AFM study showed that the smooth surfaces of 1∼2 nm roughness can be prepared for both DGEBA and OG when the films were thick (> 1 μm). The electrical properties such as dielectric constant, capacitance and the leakage current with respect to the applied voltage were all stable even after the stress of 100 V/100˚ C was applied for 0∼10000 seconds indicating that the insulating properties of DGEBA and OG films were very reliable.

본 논문은 플렉시블 디스플레이용 stainless steel(SS) 기판의 평탄막 재료로서 유기 및 유기/무기 하이브리드 에폭시 레진을 연구한 첫 결과를 보고한다. 유기 에폭시로는 diglycidyl ether of bisphenol A(DGEBA)를, 하이브리드 에폭시는 실세스퀴옥산이 포함된 octa(dimethylsiloxypropylglycidylether) silsesquioxane(OG)를 선택하였다. 경화제로는 diaminodiphenylmethane(DDM)을 에폭시와 1:2 당량비로 사용하였으며 두 물질 모두 SS 기판위에 어려움 없이 코팅이 되었다. TGA로 살펴본 열 안정성 분석은 순수한 물질이나 경화된 필름이나 모두 OG가 DGEBA 보다 안정하며 AFM에 의한 필름 표면의 관찰은 필름이 충분히 두꺼운 경우(> 1 m) 1∼2 nm 정도의 표면 거칠기 값을 갖는 평탄한 면이 얻어진다는 것을 보여주었다. 또 이 필름들은 0~10000 초에 걸치는 시간 동안 100 V와 100 ℃의 외부 스트레스를 받은 후에도 일정한 유전 상수(∼3.5), 정전 용량 및 전류의 흐름을 나타내 절연 특성이 안정되어 있다는 것을 알 수 있었다.

Keywords: epoxy; silsesquioxane; flexible display; planarization; stainless steel

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2007; 31(6): 526-531

    Published online Nov 25, 2007

  • Received on Jul 30, 2007
  • Accepted on Oct 3, 2007