Dissertation > Excellent graduate degree dissertation topics show

Preparation of Poly (Vinylidene Fluoride) (PVDF) Hydrophilic Membranes by Ozone-Induced Graft Copolymerization

Author: ZhaoQiang
Tutor: CaoBing；PanKai
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: Polyvinylidene fluoride Acrylic acid Ozone graft Hydrophilic Hollow fiber
CLC: TQ325.4
Type: Master's thesis
Year: 2010
Downloads: 237
Quote: 0
Read: Download Dissertation

Abstract


Polyvinylidene fluoride (PVDF) low price and good chemical and thermal stability , high mechanical strength , fluorine atom PVDF molecular chain symmetrical distribution to cause the surface of the material surface energy is low , hydrophobicity , in oily wastewater separation process in serious pollution , thereby constraining the PVDF separation membranes , so the need for modification of the membrane material is hydrophilic . This thesis uses the strong oxidation of ozone , vinylidene fluoride (PVDF) dissolved in N-methyl- pyrrolidone , polyethylene is processed , the introduction of active peroxide groups in the molecular chain , and then by thermal initiation graft polymerization of hydrophilic monoethylenically body - acrylic acid ( AAc ) , PVDF separation membrane prepared with hydrophilic properties by a non-solvent induced phase separation method (Non-solvent induced phase inversion) . By infrared spectroscopy and contact angle measurements were used to characterize the structure and properties of the grafted polyvinylidene fluoride . Appear at 1709cm-1 wave number detected by infrared spectroscopy , AAc in the - C = O - characterized absorption peak proved successful acid segment is introduced into the PVDF in the polypropylene . Lower contact angle of the grafted PVDF membrane , pure water flux , and showed a good hydrophilic ; grafting conditions modified PVDF membrane hydrophilic , with graft monomer concentration increase its hydrophilicity increases; before and after the modification , polyvinylidene fluoride, vinyl film surface morphology by scanning electron microscopy (SEM) analysis showed that the modified separation membrane surface morphology changed greatly under the same deposition conditions , after modification , the separation membrane prepared in increase in membrane pore size , the pore size and the distribution density of the separation film and the surface of the hollow fiber , and the ozone treatment time and acrylic inputs relevant . The water flux tests further show that the graft-modified PVDF separation membrane can be significantly improved hydrophilic properties . Secondly prepared using wet and dry spinning hollow fiber . Study the impact of the of ozone processing time of the hollow fiber hydrophilic . The results show that the relatively pure PVDF hollow fibers, modified hollow fibers having a special morphology bodies, the pure water flux of a lower water contact angle and higher . Comprehensive experimental results to determine the optimum ozone treatment time was 30min, and the hydrophilicity can be obtained preferably PVDF-g-PAAc hollow fiber , the inner side surface contact angle of 48 ° , pure water flux 93.02L · m- 2 · h-1.

Related Dissertations

  1. Hydrophilic structure of different types of surface -modified polyurethane material and coagulation 12 factor nine peptide fragments,and fibrinogen P1 fragment of computer simulation of the interaction,O631.3
  2. The Synthesis and Properties Research of High Hydrophilic Polyurethane,TQ323.8
  3. Of dual responsive material for the surface modification of the aromatic polyamide film,TB383.2
  4. PVDF / PMMA / TiO 2 Composites and weather resistance of,TB33
  5. Preparation of a Water Vapor Permeability Controllable Shape Memory Polymer and Its Application on Fabrics,TS195.2
  6. Fabrication and Propertity Research of New 1, 10-Phethroline Derivative and Rare Earth Complex,O621.13
  7. Study on Preparation Oface Inhibitory Peptides and Antioxidative Peptides from Oat Protein by Enzymatic Membrane Reactor,TQ464.7
  8. Novel poly N-isopropyl acrylamide copolymer and IPN hydrogels Preparation and properties of,O633.2
  9. Study on Hydrophilic Modification and Formation Mechanism of PVDF/MMT Membranes for Oil/Water Separations,TQ028.8
  10. Study on Pvdf Membrane Modified by 2-acrylamido-2 Methylpropane Sulfonic Acid,TP212
  11. Synthesis and Properties of Epoxy Resin and Acrylate Modified Waterborne Polyurethane,TQ323.8
  12. Electrochemical Performance and Preparation of Electrospun PVDF/PMMA Membranes for Lithium Ion Battery,TM912
  13. Research on the Quality Control of the Dog Food Processing,S829.25
  14. Establishment and Evaluation of Two Methods for Microalbuminuria,R446.1
  15. Study on Surface Chemncal Modification of Poly(Vinylidene Fluoride) UF Membrane and Oily Wasterwater Treatment,X703
  16. Synthesis and Application of Polyurethane Sol to Hydrophilic Finishing of PP Fabrics,TS195.5
  17. Preparation of Elastic Exterior Wall Latex Coating with Stain Resistance,TQ630.6
  18. Synthesis of Acrylic Acid Polymers and Their Performance on Sand Solidification,TQ325.7
  19. Research of Poly (Vinylidene Fluoride) (PVDF) Microporous Membrane Molding,TQ325.4
  20. Study on Preparation of Multi-Layer Co-Extruded PVDF Cast Composite Film,TQ320.721
  21. Proton exchange membrane fuel cell synthesis and properties of,TM911.4

CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > Polyvinyl fluoride
© 2012 www.DissertationTopic.Net  Mobile