采用紫外光接枝聚合的方法将丙烯酸(AA)引入到聚丙烯(PP)微孔膜表面,制备了亲水改性微孔膜PP-g-PAA。采用傅里叶变换红外光谱仪(FT-IR)、扫描电子显微镜(SEM)对PP-g-PAA微孔膜进行表征,考察了接枝条件对膜接枝密度的影响,分析了接枝密度对膜水通量和抗污染性能的影响。结果表明,水通量随着PP-g-PAA微孔膜接枝密度的增加先增大后减小。当AA接枝密度为1642.5μg/cm2时,PP-g-PAA微孔膜通量损失率降到36.5%,可逆污染系数提高到29%,不可逆污染系数降到9%,通量恢复率提高到90.7%;随着接枝密度的增大,PP-g-PAA微孔膜抗污染性得到显著提升。
A novel design of hydrophilic membrane was obtained through grafting polymerization of acrylic acid (AA)onto the surface of polypropylene microporous membrane.Fourier transform infrared (FT-IR) and scanning electron microscopy (SEM) spectrum were used to investigate the chemical composition and surface morphologies of PP-g-AA.The research basically included some influencing factors such as monomer type,concentration of photosensitizer and irradiation time.The effect of graft density of acrylic acid on the hydrophilicity and antifouling ability of polypropylene microporous membranes were discussed.The results showed that the total fouling (Rt) was decreased to 36.5%,the reversible fouling (Rr) was increased to 29%,correspondingly the irreversible fouling (Rir) was dropped to 9% and flux recovery ratio(FRR) was increased to 90.7% dramatically when the grafting density of membrane reached 1642.5μg/cm2.The grafting density of membrane gave a great contribution for enhancing the hydrophilicity and improving the antifouling property of membrane.
[1] Yang Q,Xu Z K,Dai Z W,et al.Ulbricht,surface modification of polypropylene microporous membranes with a novel glycopolymer[J].Chemistry of Materials,2005,17(1):3050-3058.
[2] Ren P F,Fang Y,Wan L S,et al.Surface modification of polypropylene microfiltration membrane by grafting poly(sulfobetaine methacrylate) and poly(ethylene glycol):oxidative stability and antifouling capability[J].Journal of Membrane Science,2015,492(1):249-256.
[3] Pan L,Wang H,Wu C,et al.Tannic-acid-coated polypropylene membrane as a separator for lithium-ion batteries[J].ACS Applied Materials & Interfaces,2015,7(29):16003.
[4] Vitola G,Mazzei R,Fontananova E,et al.PVDF membrane biofunctionalization by chemical grafting[J].Journal of Membrane Science,2015,476(1):483-489.
[5] Liang L,Shi M,Viswanathan V V,et al.Temperature-sensitive polypropylene membranes prepared by plasma polymerization[J].Journal of Membrane Science,2000,177(1):97-108.
[6] Wang Y,Kim J H,Choo K H,et al.Hydrophilic modification of polypropylene microfiltration membranes by ozone-induced graft polymerization[J].Journal of Membrane Science,2000,169(2):269-276.
[7] Liu Z M,Xu Z K,Wang J Q,et al.Surface modification of microporous polypropylene membranes by the grafting of poly(-stearyl-L-glutamate)[J].European Polymer Journal,2003,39(12):2291-2299.
[8] Yu H,Cao Y,Kang G,et al.Enhancing antifouling property of polysulfone ultrafiltration membrane by grafting zwitterionic copolymer via UV-initiated polymerization[J].Journal of Membrane Science,2009,342(1):6-13.
[9] Deng H,Xu Y,Chen Q,et al.High flux positively charged nanofiltration membranes prepared by UV-initiated graft polymerization of methacrylatoethyl trimethyl ammonium chloride (DMC) onto polysulfone membranes[J].Journal of Membrane Science,2011,366(1):363-372.
[10] Wang X,Wei J,Dai Z,et al.Preparation and characterization of negatively charged hollow fiber nanofiltration membrane by plasma-induced graft polymerization[J].Desalination,2012,286(1):138-144.
[11] 王海涛,魏俊富,王翱,等.应用两步接枝法制备新型改性聚丙烯滤嘴材料[J].功能材料,2013,44(4):573-576.
[12] Lin A,Shao S,Li H,et al.Preparation and characterization of a new negativelycharged polytetrafluoroethylene membrane for treating oilfield wastewater[J].Journal of Membrane Science,2011,37(1/2):189-193.
[13] Yu H Y,He J M,Liu L Q,et al.Photoinduced graft polymerization to improveantifouling characteristics of an SMBR[J].Journal of Membrane Science,2007,302(1):235-242.
[14] Mohd Yusof A H,Ulbricht M.Polypropylene-based membrane adsorbers viaphoto-initiated graft copolymerization:optimizing separation performance bypreparation conditions[J].Journal of Membrane Science,2008,311(1):294-305.
[15] Liu F,Du C H,Zhu B K,et al.Surface immobilization of polymer brushes ontoporous poly (vinylidene fluoride) membrane by electron beam to improve thehydrophilicity and fouling resistance[J].Polymer,2007,48(1):2910-2918.
[16] Yu H Y,Xu Z K,Yang Q,et al.Improvement of the antifouling characteristicsfor polypropylene microporous membranes by the sequential photoinduced graftpolymerization of acrylic acid[J].Journal of Membrane Science,2006,281(1):658-665.
基金资助
国家自然科学基金(51678409);天津市科技支撑计划重点项目(15ZCZDSF00880)
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