Photo-Sensitive and Degradable Polymeric Nanocapsules from Hyperbranched Poly(Amine Ester) Grafted Nano-Silica Templates
Abstract:A facile approach for the preparation of the photo-sensitive and degradable polymeric nanocapsules containing a number of hydroxyl groups was developed. The hyperbranched poly(amine ester) grafted silica nanoparticles (SN-HPAE) were cross-linked with 4,4´-Azobenzene dibenzoyl chloride (ADC) by the reaction between the hydroxyl groups and benzoyl chloride groups. Then the silica templates were removed by being etched with HF to produce the photo-sensitive and degradable polymeric nanocapsules. The hollow structure of the polymeric nanocapsules with the inner diameter in the range of 20-100 nm was characterized by transmission electron microscopy (TEM). The solid-state UV-vis spectra of the cross-linked hyperbranched polymeric nanocapsules showed the photoresponsive behavior of the azobenzene type molecules.
Keywords: ADC; AE; AP-SN; APTES; DEA; DMF; DNA; FTIR spectrum; HDI; LbL; N=N bond; NMR; PTSA; Photo-sensitive; SN-HPAE; TEM; TGA; UV-vis spectrum; azobenzene; bond; degradable; electroluminescent devices; ethanol; hydroxyl groups; light-emitting diodes; nanocapsules; photovoltaics; polycondensation; polymerization; silica-templates
Document Type: Research Article
Publication date: December 1, 2010
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