In this study, thiol groups were introduced on the surface of cellulose nanocrystal (CNC) using (3-mercaptopropyl)trimethoxysilane (MPTS). We prepared nanocomposites using pristine CNC and MPTS-modified CNC (CNC-MPTS) as nanofillers and undergoing thiol-ene photopolymerization in trimethylolpropane tris(3-mercaptopropionate) (TMPTMP) and trimethylolpropane diallyl ether (TMPAE). By comparing the modulus and glass transition temperature (T_g) of nanocomposites with 5.0 wt% pristine CNC and the CNC-MPTS nanofillers to UV cured resin without filler, this study confirmed an increase in modulus by 1.31 and 1.59 times, and increase in T_g by 1.3 and 1.8 ^oC by universal testing machine (UTM) and dynamic mechanical analyzer (DMA), respectively.

본 연구에서는 (3-mercaptopropyl)trimethoxysilane(MPTS)를 사용하여 cellulose nanocrystal(CNC) 표면에 티올기(-SH)를 도입하였다. 순수 CNC와 MPTS로 개질된 CNC(CNC-MPTS)를 나노충전제로 사용하여 trimethylolpropane tris(3-mercaptopropionate)(TMPTMP)와 trimethylolpropane diallyl ether(TMPAE)를 thiol-ene 광중합법으로 나노복합체를 제조하였다. 5.0 wt%의 순수 CNC 및 CNC-MPTS를 나노충전제로 사용한 나노복합체의 탄성률과 T_g를 순수 수지 중합체와 비교하면, 탄성률은 1.31 및 1.59배 증가하고, T_g는 1.3 및 1.8 ^oC 증가하는 것을 만능재료시험기(UTM) 및 동적기계분석기(DMA) 측정으로 각각 확인하였다.

Keywords: cellulose nanocrystal, (3-mercaptopropyl)trimethoxysilane, thiol-ene photopolymerization, mechanical property, nanocomposites