Membrane and Water Treatment

  • 제7권5호
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  • Pages.417-431
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  • 2016
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  • 2005-8624(pISSN)
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  • 2092-7037(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Preparation and characterization of PVDF/alkali-treated-PVDF blend membranes

  • Liu, Q.F. (College of Environment and Resources, Inner Mongolia University) ;
  • Li, F.Z. (College of Environment and Resources, Inner Mongolia University) ;
  • Guo, Y.Q. (College of Environment and Resources, Inner Mongolia University) ;
  • Dong, Y.L. (College of Environment and Resources, Inner Mongolia University) ;
  • Liu, J.Y. (College of Environment and Resources, Inner Mongolia University) ;
  • Shao, H.B. (Key Laboratory of Coastal Biology & Bioresources Utilization, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS)) ;
  • Fu, Z.M. (College of Environment and Resources, Inner Mongolia University)
  • 투고 : 2015.01.16
  • 심사 : 2016.05.08
  • 발행 : 2016.09.25
⟨ 이전 논문 다음 논문 ⟩

초록

Poly(vinylidene fluoride) (PVDF) powder was treated with aqueous sodium hydroxide to obtain partially defluorinated fluoropolymers with expected properties such as improving hydrophilicity and fouling resistance. Raman spectrum and FT-IR results confirmed the existence of conjugated carbon double bonds after alkaline treatment. As the concentration increased, the degree of defluorination increased. The morphology and structure of membranes were examined. The permeation performance was investigated. The results showed that membrane's hydrophilicity increased with increase of the percentage of alkaline treated PVDF powder. Moreover, in terms of the water contact angle, it decreased from $92^{\circ}$ to a minimum of $68^{\circ}$; while water up take increased from 128 to 138%. Fluxof pure water and the cleaning efficiency increased with the increase of alkaline treated PVDF powder. The fouling potential also decreased with the increase of the percentage of alkaline treated PVDF powder. The reason that makes blending PVDF show different characteristics because of partial defluorination, which led the formation of conjugated C = C bonds and the inclusion of oxygen functionalities. The polyene structure followed by hydroxide attack to yield hydroxyl and carbonyl groups. Therefore, the hydrophilicity of blending membrane was improved. The SEM and porosity measurements showed that no obvious variations of the pore dimensions and structures for blend membranes were observed. Mechanical tests suggest that the high content of the alkaline treated PVDF result in membranes with less tolerance of tensile stress and higher brittleness. TGA results exhibited that the blend of alkaline treated PVDF did not change membrane thermal stability.

키워드

과제정보

연구 과제 주관 기관 : National Science Foundation of China

참고문헌

  1. Brewis, D.M. and Mathieson, I. (1998), "Preatments of fluoropolymers: A review of studies between 1990 and 1995", Proceedings of Adhesion Science and Technology 1st International Congress, (M. Festschrift, W.J. Van Ooij, H.R. Anderson, Jr. Eds.), VSP Publisher Inc., The Netherland, pp. 267-283.
  2. Brewis, D.M., Mathieson, I. and Sutherland, I. (1994), "The effect of tetrabutylammonium bromide on the pretreatment of poly(vinyl fluoride) with potassium hydroxide", J. Mater. Sci. Lett., 13(1), 71-72. https://doi.org/10.1007/BF02352924
  3. Barona, G.N.B., Cha, B.J. and Jung, B. (2007), "Negatively charged poly (vinylidene fluoride) microfiltration membranes by sulfonation", J. Membr. Sci., 290(1-2), 46-54. https://doi.org/10.1016/j.memsci.2006.12.013
  4. Chang, H.H., Tsai, C.H., Wei, H.C. and Cheng, L.P. (2014), "Effect of structure of PVDF membranes on the performance of membrane distillation", Membr. Water Treat., Int. J., 5(1), 41-56. https://doi.org/10.12989/mwt.2014.5.1.041
  5. Crowe, R. and Badyal, J.P.S. (1991), "Surface modification of poly(vinylidene difluoride)(PVDF) by LiOH", J. Chem. Soc., Chem. Commun., 25(14), 958-959.
  6. Li, H.B., Shi, W.Y., Zhang, Y.F and Zhou, R. (2015), "Comparison study of the effect of blending method on PVDF/PPTA blend membrane structure and performance", Memb. Water Treat., Int. J., 6(3), 205-224. https://doi.org/10.12989/mwt.2015.6.3.205
  7. Liu, Q.F. and Kim, H. (2010), "Performance evaluation of alkaline treated poly(vinylidene fluoride) membranes", Sep. Sci. Tech., 45(9), 1209-1215. https://doi.org/10.1080/01496391003775808
  8. Liu, F., Du, C.H., Zhu, B.K. and Xu, Y.Y. (2007), "Surface immobilization of polymer brushes onto porous poly(vinylidene fluoride) membrane by electron beam to improve the hydrophilicity and fouling resistance", Polymer, 48(10), 2910-2918. https://doi.org/10.1016/j.polymer.2007.03.033
  9. Mathieson, I., Brewis, D.M., Sutherland, I. and Cayless, R.A. (1993), "Adhesion studies of fluoropolymers", J. Adhes., 41(1-4), 113-128. https://doi.org/10.1080/00218469308026557
  10. Nunes, S.P. and Peinemann, K.V. (1992), "Ultrafiltration membranes from PVDF/PMMA blends", J. Membr. Sci., 73(1), 25-35. https://doi.org/10.1016/0376-7388(92)80183-K
  11. Ochoa, N.A., Masuelli, M. and Marchese, J. (2003), "Effect of hydrophilicity on fouling of an emulsified oil wastewater with PVDF/PMMA membranes", J. Membr. Sci., 226(1-2), 203-211. https://doi.org/10.1016/j.memsci.2003.09.004
  12. Ross, G.J., Watts, J.F., Hill, M.P. and Morrissey, P. (2000), "Surface modification of poly(vinylidene fluoride) by alkaline treatment 1. The degradation mechanism", Polymer, 41(5), 1685-1696. https://doi.org/10.1016/S0032-3861(99)00343-2
  13. Rye, R. (1993), "Spectroscopic evidence for radiation-induced crosslinking of poly(tetrafluoroethylene)", J. Polym. Sci. Part B: Polym. Phys., 31(3), 357-364. https://doi.org/10.1002/polb.1993.090310314
  14. Wang, P., Tan, K.L., Kang, E.T. and Neoh, K.G. (2002), "Plasma-induced immobilization of poly(ethylene glycol) onto poly(vinylidene fluoride) microporous membrane", J. Membr. Sci., 195(1), 103-114. https://doi.org/10.1016/S0376-7388(01)00548-8
  15. Yang, M.C. and Liu, T.Y. (2003), "The permeation performance of polyacrylonitrile/polyvinylidine fluoride blend membranes", J. Membr. Sci., 226(1-2), 119-130. https://doi.org/10.1016/j.memsci.2003.08.013
  16. Zhang, Q.W., Lu, J.F., Saito, F. and Baron, M. (2001), "Mechanochemical solid-phase reaction between polyvinylidene fluoride and sodium hydroxide", J. Appl. Polym. Sci., 81(9), 2249-2252. https://doi.org/10.1002/app.1663
  17. Zhang, M.G., Nguyen, Q.T. and Ping, Z.H. (2009), "Hydrophilic modification of poly (vinylidene fluoride) microporous membrane", J. Membr. Sci., 327(1-2), 78-86. https://doi.org/10.1016/j.memsci.2008.11.020

피인용 문헌

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