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The Hydrophilic Modification Study of the Polyvinylidene Fluoride

Author: WangChunYa
Tutor: CaoBing；PanKai
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: Polyvinylidene fluoride UV graft Ozone graft Hydrophilic Anti - pollution
CLC: TQ325.4
Type: Master's thesis
Year: 2010
Downloads: 324
Quote: 1
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Abstract


Polyvinylidene fluoride (PVDF) has a good chemical stability, thermal stability and mechanical strength , excellent in membrane materials suitable for the performance of the preparation . As the membrane material , PVDF membrane surface is hydrophobic and can easily be protein contamination , limiting the application of PVDF material . Thus , the hydrophilicity of the PVDF is particularly important. 3 - ( methacrylamide yl) propyl - dimethyl (3 - sulfonic acid) ammonium hydroxide (MPDSAH) is typical of the dual - ionic substances , the monomer containing both hydrophilic and anti - protein contamination group , available The modified hydrophobic material . Firstly, UV irradiated PVDF finished film the graft MPDSAH monomer way modified PVDF finished film . Secondly, the use of ozone-treated PVDF solution way the graft MPDSAH monomer modified PVDF material . Improved simultaneously the hydrophilic surface of the PVDF membrane , and the purpose of anti - protein contamination performance . First, the paper under ultraviolet irradiation conditions photosensitizer benzophenone (BP) as the initiator, the initiator the MPDSAH monomer in the grafting of the surface of the PVDF membrane , The method of preparing a hydrophilic PVDF membrane . Discussed the different intensity ultraviolet light , the concentration of different monomers , different concentrations of the initiator on the grafting reaction impact the optimization of the reaction conditions . The results show that , by way of UV irradiation may be MPDSAH successfully grafted to the surface of the PVDF membrane and improve the adsorption properties of the surface of the PVDF membrane hydrophilic and anti-protein . Water contact angle of the surface of the PVDF membrane can be decreased to 43 ° 118 ° , to BSA adsorbed amount can be 13mg/cm2 · g dropped 3mg/cm2 g . In addition , the paper also exploratory research , the use of ozone-treated PVDF solution the graft MPDSAH monomer and immersion phase inversion membrane system , the PVDF membrane hydrophilic . Layer Structure the graft MPDSAH monomer after ozone treatment , and the ratio of monomer and polymer hydrophilic . This study shows that the PVDF the finished film surface - modified may be prepared having a good separation performance of the hydrophilic poly (vinylidene fluoride) film , and high efficiency , low cost , can be realized industrial continuous operation , by ultraviolet irradiation . Grafted to the PVDF solution after treatment the zwitterionic monomer MPDSAH may also be prepared hydrophilic PVDF membrane through the ozone .

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > Polyvinyl fluoride
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