Grafting of poly(lauryl acrylate) onto nano-silica by ‘click chemistry’

Abstract

Poly(n-alkyl acrylate) with long side groups, namely, poly(lauryl acrylate)(PLA) was synthesized by reversible addition-fragmentation chain transfer(RAFT) polymerization, and the trithioester terminal groups were converted to thiol by reducing reaction. Grafting of the obtained polymer onto nano-silica modified with 3-(methacryloxy)propyl-trimethoxysilane(SiO₂-MPS) was conducted by thiol-ene ‘click chemistry’. PLA was characterized by proton nuclear magnetic resonance(¹H NMR) and gel permeation chromatography(GPC). Fourier transform infrared(FTIR) spectrometry and thermogravimetric analysis(TGA) were used to demonstrate the grafting reaction, and the grafted hairy nano-silica(SiO₂-g-PLA) was viewed under a transmission electron microscope(TEM). According to TGA, grafting ratio and grafting density of SiO₂-g-PLA are 30.27% and 0.013 chain/nm², respectively. The static water contact angle of SiO₂-g-PLA is (80.10±2.97)°, which ensures its hydrophobicity. Dispersion experiment was carried out to confirm its dispersibility in mixed solvents, indicating its potential application in coatings or composites.

Keywords

‘Click chemistry’ / Grafting / Poly(lauryl acrylate) / Nano-silica / Dispersibility

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