利用原子转移自由基聚合(Atom Transfer Radical Polymerization,ATRP)合成了分子量分布较窄的聚甲基丙烯酸-N,N-二甲氨基乙酯{Poly[2-(diethylamino)ethylmethacrylate],PDMAEMA}并通过对液体核磁共振氢谱(1 H NMR)化学位移以及弛豫时...利用原子转移自由基聚合(Atom Transfer Radical Polymerization,ATRP)合成了分子量分布较窄的聚甲基丙烯酸-N,N-二甲氨基乙酯{Poly[2-(diethylamino)ethylmethacrylate],PDMAEMA}并通过对液体核磁共振氢谱(1 H NMR)化学位移以及弛豫时间(T1、T2)的测量,研究了聚合物PDMAEMA的温度敏感、pH敏感以及离子敏感3种环境敏感行为.发现聚合物链段的运动性,以及温度和离子强度诱导的相变行为,都与体系的pH值具有强依赖关系.室温下,聚合物链段的运动性随pH值的增大而降低.酸性条件下,聚合物表现出离子敏感性,而不表现出温度敏感性.碱性条件下,聚合物表现出温度敏感性,不表现出离子敏感性.展开更多
Well-dispersed multi-walled cabon nanotubes(MWCNTs) were successfully incorporated into a supramolecular hydrogel through combining dual roles of poly(ethylene glycol)-block-poly[(2-dimethylamino) ethyl methacrylate](...Well-dispersed multi-walled cabon nanotubes(MWCNTs) were successfully incorporated into a supramolecular hydrogel through combining dual roles of poly(ethylene glycol)-block-poly[(2-dimethylamino) ethyl methacrylate](PEG-b-PDMAEMA) copolymer in dispersing MWCNTs and forming inclusion complexes with α-cyclodextrin(α-CD).Rheological behaviors of supramolecular hydrogels were investigated.The resultant hybrid hydrogels were found to be shear thinning and could be applied as a promising injectable drug delivery system.The mechanical strength of the hybrid hydrogels was greatly improved in comparison with that of the corresponding native hydrogels.展开更多
We fabricate a novel cellulose acetate （CA） ultrafiltration membrane modified by block copolymer F127-b- PDMAEMA, which is synthesized using F127 and DMAEMA via the ARGET ATRP method. Compared to conven- tional ultr...We fabricate a novel cellulose acetate （CA） ultrafiltration membrane modified by block copolymer F127-b- PDMAEMA, which is synthesized using F127 and DMAEMA via the ARGET ATRP method. Compared to conven- tional ultrafiltration membranes, the incorporation of both F 127 and PDMAEMA can not only readily increase the hydrophilicity of the membrane, but also exhibit stimuli-responsiveness to temperature and pH. Fourier transform infrared spectroscopy （FT-IR）, nuclear magnetic resonance spectroscopy （NMR）, and gel permeation chromatog- raphy （GPC） are employed to analyze the structure of the F 127-b-PDMAEMA. The membrane properties are eval- uated via scanning electron microscope （SEM） imaging, porosity test, automatic target recognition Fourier trans- form infrared spectroscopy （ATR-FTIR）, water contact angle test and permeation test. The results indicate that the F 127-b-PDMAEMA is an excellent pore agent, which contributes to an enhancement of the membrane in sensitivity to temperature and pH. The modified membrane also exhibits lower water contact angle （64.5~）, which is attributed to the good anti-fouling performance and high water permeation.展开更多
文摘利用原子转移自由基聚合(Atom Transfer Radical Polymerization,ATRP)合成了分子量分布较窄的聚甲基丙烯酸-N,N-二甲氨基乙酯{Poly[2-(diethylamino)ethylmethacrylate],PDMAEMA}并通过对液体核磁共振氢谱(1 H NMR)化学位移以及弛豫时间(T1、T2)的测量,研究了聚合物PDMAEMA的温度敏感、pH敏感以及离子敏感3种环境敏感行为.发现聚合物链段的运动性,以及温度和离子强度诱导的相变行为,都与体系的pH值具有强依赖关系.室温下,聚合物链段的运动性随pH值的增大而降低.酸性条件下,聚合物表现出离子敏感性,而不表现出温度敏感性.碱性条件下,聚合物表现出温度敏感性,不表现出离子敏感性.
文摘Well-dispersed multi-walled cabon nanotubes(MWCNTs) were successfully incorporated into a supramolecular hydrogel through combining dual roles of poly(ethylene glycol)-block-poly[(2-dimethylamino) ethyl methacrylate](PEG-b-PDMAEMA) copolymer in dispersing MWCNTs and forming inclusion complexes with α-cyclodextrin(α-CD).Rheological behaviors of supramolecular hydrogels were investigated.The resultant hybrid hydrogels were found to be shear thinning and could be applied as a promising injectable drug delivery system.The mechanical strength of the hybrid hydrogels was greatly improved in comparison with that of the corresponding native hydrogels.
基金This work was financially supported by the Funda- mental Research Funds for the Central Universities of China （Nos. 3207045403, 3207045409）, National Natu- ral Science Foundation of China （Nos. 21576050, 51602052）, Jiangsu Provincial Natural Science Founda- tion of China （No. BK20150604） and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions （PAPD）.
文摘We fabricate a novel cellulose acetate （CA） ultrafiltration membrane modified by block copolymer F127-b- PDMAEMA, which is synthesized using F127 and DMAEMA via the ARGET ATRP method. Compared to conven- tional ultrafiltration membranes, the incorporation of both F 127 and PDMAEMA can not only readily increase the hydrophilicity of the membrane, but also exhibit stimuli-responsiveness to temperature and pH. Fourier transform infrared spectroscopy （FT-IR）, nuclear magnetic resonance spectroscopy （NMR）, and gel permeation chromatog- raphy （GPC） are employed to analyze the structure of the F 127-b-PDMAEMA. The membrane properties are eval- uated via scanning electron microscope （SEM） imaging, porosity test, automatic target recognition Fourier trans- form infrared spectroscopy （ATR-FTIR）, water contact angle test and permeation test. The results indicate that the F 127-b-PDMAEMA is an excellent pore agent, which contributes to an enhancement of the membrane in sensitivity to temperature and pH. The modified membrane also exhibits lower water contact angle （64.5~）, which is attributed to the good anti-fouling performance and high water permeation.
