A versatile method for the preparation of end-functional polymers onto SiO2 nanoparticles by a combination of surface-initiated ATRP and Huisgen [3 + 2] cycloaddition |
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| Authors: | JC Chen WQ Luo JM Xiang F Chen |
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| Institution: | a Department of Chemistry and Chemical Engineering, Ankang University, 92 Yucai Road, Ankang 725000, China
b Department of Agriculture and Life Sciences, Ankang University, Ankang 725000, China |
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| Abstract: | A versatile method was developed for the chain-end functionalization of the grafted polymer chains for surface modification of nanoparticles with functionalized groups through a combination of surface-initiated atom-transfer radical polymerization (ATRP) and Huisgen 3 + 2] cycloaddition. First, the surface of SiO2 nanoparticles was modified with poly(methyl methacrylate) (PMMA) brushes via the “grafting from” approach. The terminal bromides of PMMA-grafted SiO2 nanoparticles were then transformed into an azide function by nucleophilic substitution. These azido-terminated PMMA brushes on the nanoparticle surface were reacted with alkyne-terminated functional end group via Huisgen 3 + 2] cycloaddition. FTIR and 1H NMR spectra indicated quantitative transformation of the chain ends of PMMA brushes onto SiO2 nanoparticles into the desired functional group. And, the dispersibility of the end-functional polymer-grafted SiO2 nanoparticles was investigated with a transmission electron microscope (TEM). |
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| Keywords: | Surface modification Atom-transfer radical polymerization (ATRP) Cu-catalyzed Huisgen [3 + 2] cycloaddition Chain-end functionalization |
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