接枝法制备温度响应型PVDF-g-PNIPAM复合膜的研究

Thermo-sensitive PVDF-g-PNIPAM Membrane Preparation via Grafting Copolymerization Method

开展碱改性-接枝法制备温度响应型聚偏氟乙烯(PVDF)复合膜的制备工艺的研究。通过强碱改性法,将PNIPAM单体接枝到PVDF基膜上,制备出具有温度响应特性的智能膜。通过测定低临界溶解温度(LCST)、纯水通量、截留率等指标,研究不同的交联剂浓度、交联反应温度、接枝率对智能膜的温度响应性能的影响,并采用傅氏变换红外光谱对复合膜的化学成分进行了表征。红外光谱分析证实已经接枝上了温敏基团PNIPAM,实验结果表明,制备此温度响应型聚偏氟乙烯复合膜的最佳工艺条件为:交联剂(MBAA)浓度0.02 mol/L,接枝率7%,交联反应温度50℃～60℃。结果同时表明复合膜具有良好的温度响应性能及抗污染性。

Carry out the research of preparation process of temperature-responding polyvinylidene fluoride（PVDF） composite intelligent membrane by grafting copolymerization method. PNIPAM monomer is grafted onto the PVDF-based membrane by alkali modification method in order to prepare composite intelligent film that having temperature response characteristic. With the determination of the lower critical temperature （LCST）, pure water flux, retention and other indicators, it figure out that how the different cross-linking concentration, the temperature of the cross-linking reaction, grafting rate influence the temperatre response performance of membrane. And infrared spectral analysis results confirmed that thermo-sensitive group PNIPAM has been grafted onto PVDF membrane. Experimental results showed that the optimum technological conditions are： crosslinking agent （MBAA） concentration 0.02 mol/L, grafting rate 7%, cross-linking reaction temperature 50 ℃-60 ℃. The results also showed that the compound membrane had good resistance to polluting and temperature response performance.