| 祝 黎,庄志良,吴伟兵,戴红旗.天然纤维素均相接枝聚N-异丙基丙烯酰胺及其温敏性研究[J].中国造纸学报,2016,31(1):41-46 |
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| 天然纤维素均相接枝聚N-异丙基丙烯酰胺及其温敏性研究 |
| 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 |
| 中文关键词: 天然纤维素 原子转移自由基聚合 均相 温敏性 N-异丙基丙烯酰胺 |
| Key Words:natural cellulose AGET ATRP homogeneous thermo-responsive N-isopropylacrylamide |
| 基金项目: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。 |
| 作者 | 单位 | | 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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| 中文摘要: |
| 利用基于电子转移再生活性种的原子转移自由基聚合(AGET ATRP)将单体N-异丙基丙烯酰胺(NIPAAM)接枝到天然纤维素上制得纤维素接枝聚N-异丙基丙烯酰胺(cell-PNIPAAM)。FT-IR、1H-NMR和13C-NMR分析表明,成功合成了cell-PNIPAAM；凝胶渗透色谱分析表明,接枝率随反应体系中N,N-二甲基甲酰胺（DMF）体积比的减小而增大,该聚合物分子质量的多分散性在2.0左右,表明聚合反应在一定程度上是可控的；热重分析显示，聚合物的热稳定性相比于天然纤维素略为提高；TEM图片显示，聚合物在高于其最低临界相转变温度(约为34℃)时,聚合物与水相分离并呈球形结构,平均直径约为40 nm。 |
| 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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