Article
  • Study on the Improved Abrasion Resistance of Polycarbonate Substrate by UV-curable Organic/Inorganic Hybrid Coatings
  • Yoon SE, Woo HG, Kim DP
  • 자외선 경화형 유기/무기 복합코팅에 의한 폴리카보네이트의 내마모성 향상 연구
  • 윤석은, 우희권, 김동표
Abstract
Transparent, abrasion resistant coatings with 4∼13 ㎛ thickness were prepared by spin-coating on polycarbonates with organic/inorganic hybrid solutions, followed by UV curing and heat treatment at 120 ℃ for 12 hours. The coating solutions were composed of inorganic phase and organic phase in 0:100, 20:80, 30:70, 50:50, 80:20 wt% ratios, respectively, mixed with photoinitiator, sensitizer and surfactant. The inorganic phase was formed by sor-gel reaction of TEOS and silane coupling agent MPTMS in 1:2 or 2:1 molar ratios, the organic phase consisted of difunctional urethane acrylate oligomeric resin, multifunctional acrylate TMPTA and HDDA in 4:3:3 wt% ratio. The coating systems were investigated by FT-IR, 29Si-NMR spectra. In addition, TGA/DSC for thermal analysis and SEM, AFM observation for coated surface were examined. Generally, the homogeneity of phases, the surface smoothness of coating and abrasion resistance were improved with the higher content of inorganic component. Namely, coating system with below 10Å, surface roughness and Tg of 150 ℃ showed only 16% decrease in light transmittance after abrasion test, whereas uncoated polycarbonate substrate exhibited 46% decrease.

폴리카보네이트 표면에 spin-coating한 유/무기 복합 코팅막을 자외선 경화와 가열(120℃, 12시간)처리함으로써 약 4∼13㎛ 두께의 투명한 내마모성 유/무기 복합코팅막을 제조하였다. 코팅용액은 무기상과 유기상을 각각 0:100, 20:80, 30:70, 50:50, 80:20 중량비로 혼합한 다음 광개시제, 증감제 및 계면활성제를 첨가하여 제조하였다. 무기상은 TEOS와 실란커플링제 MPTMS을 1:2 혹은 2:1 몰비로 혼합하여 졸-겔 반응으로 제조하였으며, 유기상은 2관능형 urethane acrylate 올리고머, 다관능형 TMPTA와 HDDA를 4:3:3 wt%비율로 혼합하여 제조하였다. 유/무기복합상의 화학적 변화는 FT-IR, 29Si-NMR로 분석하였으며, 열분석과 코팅층 표면형상은 TGA/DSC, SEM, AFM으로 분석하였다. 무기물의 함량과 실란커플링제의 첨가량이 증가할수록 분자수준의 혼화도가 개선되고 표면 평활도와 내마모성도 향상되었다. 즉 약 10Å이하의 표면 거칠기와 약 150℃의 Tg를 나타내는 시료는 500회 마모시험 전후 단지 16%의 광투과도 감소만을 보인 반면에, 무코팅 폴리카보네이트는 46%의 광투과율 감소를 나타내었다.

Keywords: Organic/inorganic hybrid; UV curing; Polycarbonate; Abrasion resistance

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  • 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

  • 2000; 24(3): 389-398

    Published online May 25, 2000