In this study, multi-walled carbon nanotubes (MWCNTs) were oxidized with a mixture of H2SO4:HNO3(3:1 v/v). After oxidation, oxidized MWCNTs were treated with thionyl chloride (SOCl2) and 1,4-butanediol (BD) in sequence at room temperature to introduce hydroxyl groups on the surface of MWCNTs. The prepared MWCNT-OH was silanized with 3-methacryloxypropyltrimethoxylsilane (MPTMS), to introduce polymerizable methacrylate groups to make MWCNT-MPTMS. MWCNT-MPTMS was used for the emulsion polymerization of 2-ethylhexyl acrylate (2-EHA), nbutyl acrylate (n-BA), methyl methacrylate (MMA), and acrylic acid (AAc) as monomers to prepare electrically conductive acrylic pressure-sensitive adhesive (EPSA). We found increase of Tg, viscosity, peel strength and tack and decrease of sheet resistivity with increase of MWCNT-MPTMS contents in EPSA from 0 to 0.5 wt%.

본 연구에서는 개질된 다중벽 탄소나노튜브(MWCNTs)를 충전제로 사용하여 전기 전도성 아크릴계 점착제 제조에 관한 연구를 수행하였다. 황산:질산(3:1 v/v)의 혼산을 사용하여 MWCNTs 표면에 카르복시기를 도입 후, SOCl2와 1,4-butanediol(BD)를 반응시켜 MWCNT-OH를 제조하였다. 제조된 MWCNT-OH에 3-methacryloxypropyltrimethoxylsilane (MPTMS)를 반응시켜 methacrylate기를 도입하였다. 표면 개질된 MWCNT, 2-ethylhexyl acrylate(2-EHA), n-butyl acrylate(n-BA), methyl methacrylate(MMA)와 acrylic acid(AAc)를 단량체로 하여 유화중합법으로 아크릴 점착제를 제조하였다. MWCNT-MPTMS의 함량이 0~0.5 wt%로 증가할수록, 점도, 박리강도 및 점착력은 증가하고, 면 저항값은 낮아지는 것을 확인하였다.

Keywords: MWCNT; silane coupling agent; emulsion polymerization; electrically conductive pressure sensitive adhesive