ATRP法合成接枝共聚物PVDF-g-PNIPAAm及其分离膜的研究

以氯化亚铜(CuCl)/三(N,N-二甲基氨基乙基)胺(Me₆TREN)为催化配位体系, 用DMF作为溶剂, 通过原子转移自由基聚合(ATRP)方法直接在商用聚偏氟乙烯(PVDF)粉末上接枝温敏性材料N-异丙基丙烯酰胺(NIPAAm). 红外光谱(FTIR)和核磁共振(¹H NMR)分析表明, PNIPAAm成功接枝到了PVDF上. 考察了聚合反应时间及反应温度对接枝率的影响. 接枝共聚物以相转化法进行制膜, 通过纯水通量测试温敏性能, 结果表明, PVDF能成功用于ATRP反应, 当温度变化时所制备的PVDF-g-PNIPAAm共聚膜呈现出一定的温度敏感性能.

Synthesis and Characterization of Graft Copolymer PVDF-g-PNIPAAm via ATRP and Its Separating Membranes

The direct graft temperature-sensitive material N-isopropylacrylamide(NIPAAm) on commercial poly(vinylidene fluoride)(PVDF) via atom transfer radical polymerization(ATRP) is demonstrated. The application of ATRP used Copper(Ⅰ) chloride(CuCl)/Tris(2-dimethylaminoethyl)amine(Me6TREN) as the catalyst systems and N,N-dimethylformamide(DMF) as solvent. The graft copolymers of PVDF-g-PNIPAAm were characterized by Fourier transform infrared (FTIR) and 1H NMR spectra. The effects of polymerization temperature and reaction time on grafting ratio were studied. The PVDF-g-PNIPAAm membranes were prepared from the graft copolymers by the phase inversion method. The effect of temperature on the flux of pure water for the PVDF-g-PNIPAAm membrane was investigated. The results show that alkyl fluorides are successfully applied in the ATRP and the PVDF-g-PNIPAAm membranes can exhibit temperature-sensitive performance as the temperature change.