两亲性共聚物P(MMA-co-AMPS)对聚偏氟乙烯超滤膜性能的影响

Effect of Amphiphilic Copolymer P( AMPS-co-MMA) on the Performance of PVDF/P( MMA-co-AMPS) Ultrafiltration Membrane

以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为亲水单体,甲基丙烯酸甲酯(MMA)为疏水单体,偶氮二异丁腈(AIBN)为引发剂,采用自由基共聚合法制得了两亲性共聚物P(AMPS-co-MMA);以两亲性共聚物P(AMPS-co-MMA)与聚偏氟乙烯(PVDF)共混,通过相转变法制备PVDF/P(MMA-co-AMPS)超滤膜。利用傅里叶变换红外光谱、热失重法表征无规共聚物的组成和热稳定性能。并通过扫描电子显微镜,傅里叶变换红外光谱、吸水率测试、表面润湿性测试,探讨了不同单体摩尔比对PVDF/P(MMA-co-AMPS)超滤膜的结构及性能的影响。结果表明,单体AMPS与MMA间发生自由基聚合生成两亲性共聚物P(AMPS-co-MMA)。PVDF/P(MMA-co-AMPS)超滤膜表面多孔,内部有大孔,存在相对致密皮层和多孔的支撑层。当2-丙烯酰胺基-2-甲基丙磺酸和甲基丙烯酸甲酯的摩尔比为2∶1时,PVDF/P(MMA-co-AMPS)超滤膜吸水率和表面润湿性能最好。

Amphiphilic copolymer P（ AMPS-co-MMA） was prepared by free radical copolymerization. In this reaction,2-acrylamide-2-methyl propane sulfonic acid（ AMPS）,methyl methacrylate（ MMA）,azodiisobutyronitrile（ AIBN）were respectively used as hydrophilic monomer,hydrophobic monomer and initiator. P（ MMA-co-AMPS） ultrafiltrat- ion membranes were prepared by immersion precipitation phase inversion technique. The composition and thermal stability of amphiphilic copolymer P（ AMPS- co-MMA） were characterized by FT-IR and thermo-gravimetric analysis. The effects of different monomer mass ratio on structure and properties of ultrafiltration membranes were studied by SEM,FT-IR,water absorption test and water droplet test. The results show that amphiphilic copolymer P（ AMPS-co-MMA） is synthesized between AMPS monomer and MMA monomer by free radical copolymerization. PVDF / P（ MMA-co-AMPS） ultrafiltration membranes show surface with porous structure,internal macroporous structure,relatively dense cortex and porous support layer. When the mole ratio of 2-acrylamide-2-methyl propane sulfonic acid and methyl methacrylate is 2∶ 1,the water absorption and surface wettability of PVDF / P（ MMA-co-AMPS） ultrafiltration membranes are the best.