将有机碱多乙烯多胺直接加到聚偏氟乙烯（PVDF）铸膜液中，利用L-S相转化法制备PVDF超滤膜；运用红外光谱、扫描电镜、接触角仪等对不同多乙烯多胺含量超滤膜的结构和性能进行表征。结果表明，多乙烯多胺的加入使PVDF超滤膜产生脱氟化氢反应，超滤膜的润湿性有明显改善。随着多乙烯多胺含量的增加，膜通量不断上升；当多乙烯多胺含量不超过6%时，超滤膜对BSA的截留率基本保持不变，当含量超过6%时，超滤膜的截留率明显下降。

Organic base of polyethylene polyamine was added directly to the casting solution of poly(vinylidene fluoride) (PVDF). PVDF ultrafiltration membrane was prepared by using L-S phase inversion technique. Then, the structure and properties of the prepared membranes were characterized by means of IR, SEM, contact angle test, et al. The results indicated that dehydrogenation fluoride reaction on the surface of PVDF ultrafitration membranes was produced by the addition of polyethylene polyamine. Wetting of ultrafitration membranes was improved significantly. Flux of membranes was increased constantly as rising the contents of polyethylene polyamine.  The BSA retention rate was unchanged essentially at the content of polyethylene polyamine no more than 6%, while the ultrafiltration membrane retention rate was decreased significantly at the content of polyethylene polyamine more than 6%.

[1] Ulbricht M. Advanced functional polymer membranes[J]. Polymer, 2006, 47(7) : 2217~2262.
[2] Zhang M G, Nguyen Q T, Ping Z H. Hydrophilic modification of Poly(vinylidene fluoride) microporous membrane[J]. Journal of Membrane Science, 2009, 327(1-2) : 78~86.
[3] LI Ling, ZHOU Ju, SU Xin. Preparation and performance of PVDF/montmorillonite ultrafiltration membranes [J]. J Chem Eng of Chinese Univ, 2008, 22(6) : 1037~1042.
[4] Zhao Y H, Qian Y L, Zhu B K, et al. Modification of porous Poly(vinylidene fluoride) membrane using amphiphilic polymers with different structures in phase inversion process[J]. Journal of Membrane Science, 2008, 310(1-2) : 567~576.
[5] Chang Y, Shih Y J, Ruaan R C, et al. Preparation of Poly(vinylidene fluoride) microfiltration membrane with uniform surface-copolymerized poly(ethylene glycol) methacrylate and improvement of blood compatibility[J]. Journal of Membrane Science, 2008, 309(1-2) : 165~174.
[6] 孙秀丽, 李伟英, 文晨. TiO2对PVDF超滤膜结构与性能的影响[J]. 膜科学与技术, 2011, 31(4) : 17-21.
[7] Boccaccio A, Bottino A, Capannelle G, et al. Characterization of PVDF membranes by vibrational spectroscopy[J]. J.memb Sci, 2002, 210 : 315~329.
[8] 陈炜. 聚偏氟乙烯（PVDF）平板膜的制备工艺及化学改性的研究[D]. 浙江: 浙江大学材料与化学工程学院, 2003.
[9] 沈 娟, 邱新平, 李勇, 等. 碱处理PVDF膜对制备高电导率质子交换膜的作用[J]. 化学学报, 2005, 63(13) : 1187~1192.
[10] Ross G.J. Surface modification of PVDF by alkaline treatment[J]. Polymer, 2000(41) : 1685~1696.
[ 11] Owen ED, Shah M, Twigg MV. Phase transfer catalysed degradation of Poly(vinylchloride),     Product characterization and handling. Polym Degrad Stab, 1996. 51 : 151~158.
[ 12] Cho JW, Song HY. Dehydrofluorination of a copolymer of vinylidene fluoride and tetrafluoroethylene by phase transfer catalysis reaction.J Polym Sci:Part A: Polym Chem 1995,   33 : 2109~2112.
[ 13] Lu Yan, Yu Shui Li, Chai Bao Xiang, et al. Effect of nano-sized Al2O3-particle addition on PVDF ultrafiltration membrane performance[J]. Journal of Membrane Science, 2006, (276) : 162–167.
[ 14] 施柳青, 卞晓锴, 陆晓峰. 改性聚偏氟乙烯超滤膜的制备与性能的研究[J]. 膜科学与技术, 2010, 30(6) : 112~117.