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      저자 : Kazem Dindar Safa (검색결과 1 건)
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        Synthesis of Thermosensitive Nanohydrogels by Crosslinker Free Method Based on N-Isopropylacrylamide: Applicable in the Naltrexone Sustained Release

        Marziyeh Fathi,Ali Akbar Entezami,Ali Ebrahimi,Kazem Dindar Safa 한국고분자학회 2013 Macromolecular Research Vol.21 No.1

        A unique and rapid method was used to synthesize thermosensitive self-crosslinked nano (N-isopropylacrylamide-vinylpyrrolidone-acrylamide) (NIPAAm-VP-AAm) terpolymers. Nanohydrogels were obtained within 30 min during a polymerization reaction with a convenient yield due to the high dilution of aqueous solution at an elevated temperature. Furthermore, hydrogen peroxide (H2O2) was employed for the first time as a safe initiator without any toxic segments for the thermosensitive polymer synthesis. Different nanohydrogels were obtained by modulating the molar ratio of monomers to initiators and their influences on the composition ratios, thermoresponsive behavior, size distribution, phase separation, and nanohydrogel drug release were investigated. As the synthetic route is crosslinker free, the obtained nanohydrogels can be introduced as a non-toxic efficient drug delivery system (DDS). The possibility of free radical formation on the PNIPAAm chains, which leads to the crosslinked structure,has been investigated theoretically by quantum mechanical calculations. The potential energy surface of the reaction was examined by changing the distance between the OH radical and the H atoms. Considering these calculations,the reaction can proceed from all pathways as it is observed experimentally. The average size of nanohydrogels, as revealed by dynamic light scattering (DLS) and transmission electronic microscopy (TEM), is <50 nm. Finally, naltrexone as an opiate antagonist was selected as a model drug for the investigation of nanohydrogel drug delivery capabilities. Nanohydrogels show sustained naltrexone release beyond 3 months without any initial burst release.

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