Functionalization of silica nanoparticles with 4-isocyanato-4'-(3,3'-dimethyl-2,4-dioxo-azetidino)diphenyl methane, surface chemical reactivity and nanohybrid preparation.
This paper reports a facile approach to functionalize silica nanoparticle (SNP) surfaces, using 4-isocyanato-4'-(3,3'-dimethyl-2,4-dioxo-azetidino)diphenyl methane (MIA) as a reaction agent. Incorporation of MIA onto SNP surfaces is demonstrated with infrared spectrometry, (1)H NMR, and thermal analysis. The amounts of MIA moieties bonded to SNP surfaces are adjustable with the MIA contents in reaction systems. This modification approach brings azetidine-2,4-dione groups, which are selectively reactive toward primary amines, to SNP surfaces and the result is that the MIA-modified SNPs are effective and divergent intermediates for preparation of SNP-based nanohybrid materials. Consequently, SNP-cored polystyrene star polymers and SNP-polyhedral oligomeric silsesquioxane (POSS) nanohybrids are prepared with reaction of MIA-modified SNPs with amine-functionalized agents, demonstrating the applications of MIA-modified SNP particles in nanomaterial preparations.
Department of Chemical Engineering and R&D Center for Membrane Technology, Chung Yuan Christian University, #200, Chung-Pei Road, Chungli, Taoyuan 32023, Taiwan. ylliu@cycu.edu.tw
Ying-Ling
YL
Liu
Yen-Hsing
YH
Wu
Ru-Jong
RJ
Jeng
Shenghong A
SA
Dai