양전하를 갖는 poly(allylamine hydrochloride)(PAH)와 음전하를 갖는 poly(acrylic acid)(PAA) 전해질 폴리머를 사용하여 layer-by-layer(LBL) self-assembly 방법에 의해 초친수 특성을 갖는 박막을 제조하였다. PAH/PAA 박막의 밀착강도를 증가시키기 위하여 glutaraldehyde(GA) 수용액을 이용하여 amine-aldehyde의 화학반응에 따른 박막의 표면구조 변화, 막두께, 투과율, 접촉각, 밀착강도 특성을 측정하였다. PAH와 PAA 용액 침적 사이에 기판을 GA 수용액에 침적함으로써 박막의 두께는 감소하였지만 밀착강도는 2배 이상 증가하였다. 밀착강도의 증가는 PAH 와 GA의 amine-aldehyde의 화학반응에 의한 결과라는 것을 fourier transform infrared(FT-IR) spectroscopy를 사용하여 확인하였다. 제조된 PAH/PAA and PAH/GA/PAA 박막은 물 접촉각 $5^{circ}$이하의 초친수 박막 특성을 보여주었고, 550 nm 파장에서 91.3% 이상의 높은 투과율을 나타내었다.
Superhydrophilic thin film consisted of positively charged poly (allylamine hydrochloride) (PAH) and negatively charged poly (acrylic acid) (PAA) was fabricated by a layer-by-layer (LBL) self-assembly. Glutaraldehyde (GA) was used in order to increase an adhesion hardness by amine-aldehyde reaction. The surface morphology, thickness, transmittance, water contact angle and adhesion hardness of PAH/PAA thin film with or without GA were measured. The adhesion hardness of PAH/PAA thin film with GA deposition increased over 2 times although the film thickness of PAH/GA/PAA decreased than that of PAH/PAA thin film. The increase of adhesion hardness by amine-aldehyde reaction between PAH and GA was measured by fourier transform infrared (FT-IR) spectroscopy. Fabricated PAH/PAA and PAH/GA/PAA thin films showed water contact angel under $5^{circ}$ and high transmittance over 91.3% at 550 nm.
