Photo-Sensitive and Degradable Polymeric Nanocapsules from Hyperbranched Poly(Amine Ester) Grafted Nano-Silica Templates
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: Photo-sensitive, degradable, nanocapsules, silica-templates, polycondensation, hydroxyl groups, SN-HPAE, ADC, TEM, azobenzene, DNA, LbL, HDI, AP-SN, AE, APTES, DEA, PTSA, DMF, ethanol, NMR, TGA, FTIR spectrum, polymerization, σ-bond, π-bond, N=N bond, UV-vis spectrum, electroluminescent devices, photovoltaics, light-emitting diodes, bond
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