Dissertation > Excellent graduate degree dissertation topics show

Prepare and Properties of Poly (Vinyl-Alcohol)/Poly(Acryl Acid) Semi-Interpenetrating Membranes

Author: WangZuoZuo
Tutor: DengJianYuan
School: Beijing University of Chemical Technology
Course: Materials Science
Keywords: PVA AA SIPN Hydrophilic Water-resistant
CLC: TB383.2
Type: Master's thesis
Year: 2007
Downloads: 147
Quote: 0
Read: Download Dissertation

Abstract


Polyvinylalcoho/polyacrylic acid (PVA/PAA) semi-interpenetrating polymer network (SIPN) membranes have been synthesized by in situ polymerization of acrylic acid monomer in the presence of PVA, with ammonium persulfate (APS) as initiator and N,N’-methylene bisacrylamide (MBA) as cross-linking agent.The structures of the resulting semi-interpenetrating polymer network (SIPN) membranes were characterized by FT-IR, it showed that the O—H of PVA and C=O of PAA were shifted to low frenqucy, which indicated that strong hydrogen bonding between—OH of PVA and—COOH of PAA. The SIPN membranes were characterized by DMTA, it showed that there was only a peak, which was between the Tg of PVA and PAA component. Moreover, the micromorphology by TEM indicated that SIPN structures have been formed. From discussion above, it showed that good compatibility exists between PVA and PAA.The influence of varing both PVA/AA ratio and crosslinking agent ratio on the properties of the SIPN membrane were also investigated. The results showed that, when the mass ratio of PVA and AA was 80:20 or 70:30, the molar ratio of cross-linking agent was 0.3% or 0.5% or 0.7% of monomers, and the mass ratio of initiator was 0.5% of monomers, PVA/PAA mixed solution showed good film-forming properties.The above PVA/PAA mixed solution were coated on PET membrane easily, and the coating was flat and smoothly. It also found that the optic capacity of the SIPN membranes was good.Meanwhile, the hydrophilic and water-resistance properties of the SIPN membrane were also investigated. In the vast majority of cases, the water static contact angles of the SIPN membranes were lower than 30 degrees. When the mass ratio of PVA and AA was 70:30 and the molar ratio of cross-linking agent was 0.7% of monomers, and the mass ratio of initiator was 0.5% of monomers, the water static contact angle was the lowest, about 23 degree; The dissolving ratio and swelling ratio of the SIPN membranes were found to be lower than those for either pure PAA or pure PAA membranes. When the mass ratio of PVA and AA was 70:30 and the molar ratio of cross-linking agent was 0.7% of monomer, and the mass ratio of initiator was 0.5% of monomers, the resulting SIPN membranes remained integrated and non-tacky after being immersed for more than 30 d in water with temperature in the range 25-55℃, which is indicative of good water-resistance. Moreover, With the increase of cross-linking agent ratio, the heat-treatment temperature and the heat-treatment time, the adhesive bond between the coating and the PET membrane became stronger, which showed good water-resistance of the coating.

Related Dissertations

  1. Study on the Mechanical Properties of Pva-high Toughness Cementitious Composites,TU528
  2. The Effect of Survival Pressures on Ascorbic Acid and Its Biosynthesis in the Giant Spiny Frog Paa Spinosa,Q958.1
  3. 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
  4. Research on Spinning Performance of Collagen and PVA Composite Solution,TQ340.64
  5. Modification for PVA-Based Composite Packaging Material with Nano-SiO2 and Its Influence on Fresh Preservation Effect of Salted Duck Eggs,TS253.46
  6. Effect of Pyruvate, Creatine and Creatine-Pyuvate on Profile of Amino-Acids and Relevant Enzyme Activity in Broiler Chickens,S831.5
  7. Acrylic acid - acrylamide superabsorbent properties of high-powered,TQ324.8
  8. PVA fiber concrete damage evolution acoustic emission monitoring and destructive mechanism,TU528.572
  9. BC / PVA composite gel film preparation and properties of,TB383.2
  10. Effects of Cysteamine Hydrochloride on Growth Performance, Serum Biochemical Indicators and Cecal Microorganism of AA Broilers,S831.5
  11. Study on the Performance of Bamboo Charcoal as Soil Modifier,S156.2
  12. Study on the Meltblown Process and Performance of Watersoluble Polyvinyl Alcohol,TS174.3
  13. Research on Preparing PVA Release Film and Its Related Properties,TB383.2
  14. Preparation and Properties of PVA / collagen hydrolyzate / silica composite materials,TB332
  15. Theme: Study on the Esterification Reaction with Pervaporation Membrane,TQ203
  16. Study on Hydrophilic Modification and Formation Mechanism of PVDF/MMT Membranes for Oil/Water Separations,TQ028.8
  17. Oxidative Damage to DNA by Amino Acids/1, 10-phenanthroline Copper (Ⅱ) Complexes,Q523
  18. Study on Denitrifying Sludge Enrichment in Seawater and Immobilization,X703
  19. Design and Development of Specific Cotton Yarn for Elastic Light and Thin Yarn-dyed Fabric,TS104.2
  20. The Research of Coupled Arc AA-TIG Welding,TG444
  21. Study on Preperation, Characterization and Properties of Biodegradable Plastics of Potato Starch-MA Ester,TB383.2

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile