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| Preparation of Cellulose-g-PNIPAAM Copolymers by Atom Transfer Radical Polymerization |
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| DOI：10.11981/j.issn.1000-6842.2016.01.41 |
| Key Words:natural cellulose; AGET ATRP; homogeneous; thermo-responsive; N-isopropylacrylamide |
| Fund Project:国家自然科学基金项目(No.31200453,No.31270614)；中国博士后科学基金面上项目。 |
| Author Name | Affiliation | | 祝 黎 | 南京林业大学,江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 | | 庄志良 | 南京林业大学,江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 | | 吴伟兵* | 南京林业大学,江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 | | 戴红旗 | 南京林业大学,江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 |
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| Abstract: |
| Cellulose-graft-poly N-isopropylacrylamide (cellulose-g-PNIPAAM) copolymers were prepared by atom transfer radical polymerization (AGET ATRP) under mild conditions. The graft copolymers were characterized by FT-IR, 1H-NMR and 13C-NMR measurements, the results confirmed that PNIPAAM was covalently bonded to cellulose backbone. GPC analysis showed that the grafting rate increased with the decrease of the ratio of DMF in reaction system, the copolymer molecular weight distributed around 2.0, which indicated that the reaction could be well-controlled. TGA analysis confirmed that the polymer was more stable than natural cellulose at high temperature. TEM photo showed that the copolymer had the temperature-responsive properties which were similar to the expected stimuli-responses by PNIPAAM. The copolymer presented spherical structure and had average diameter of 40 nm when temperature was higher than the lowest phase change critical temperature. The UV absorbance of the copolymer showed that there was the lowest critical phase change temperature of 34℃. |
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