کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8333915 | 1540268 | 2013 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermoresponsive chitosan/N-isopropylacrylamide copolymer through atom transfer radical polymerization
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Regioseletive copolymerization of N-isopropylacrylamide (NIPAM) onto chitosan was achieved by atom transfer radical polymerization (ATRP) by using a regioselective 3,6-di-O-bromoisobutyryl-2-N-phthaloyl chitosan as a macroinitiator. The degree of polymerization (DP) of polyNIPAM onto the chitosan derivative changed by varying the ratio between NIPAM monomer, macroinitiator, ligand, and transition metal. ATRP successfully proceeded and a DP of polyNIPAM up to 110.5 was obtained. The thermal decomposition temperature of the 3,6-di-O-bromoisobutyryl-2-N-phthaloyl chitosan was significantly improved by increasing the DP of the NIPAM component. The polyNIPAM-g-chitosan derivative showed a thermoresponsive property. Although it formed a stable suspension in water at room temperature, it caused a hydrophilic-to-hydrophobic transition at around 32 °C, resulting in precipitate formation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Biological Macromolecules - Volume 52, January 2013, Pages 14-19
Journal: International Journal of Biological Macromolecules - Volume 52, January 2013, Pages 14-19
نویسندگان
S. Ifuku, T. Miwa, M. Morimoto, H. Saimoto,