Dissertation > Excellent graduate degree dissertation topics show

Preparation and Characterization of Water-Borne Polyurethane-Acrylics Hybrid Latexes

Author: JiangXuBao
Tutor: KongXiangZheng
School: Jinan University
Course: Polymer Chemistry and Physics
Keywords: Polyurethane-acrylics hybrid latex Particle size and size distribution Hydroxyethyl acrylate α-allyl glyceroether Crafting efficiency
CLC: TQ323.8
Type: Master's thesis
Year: 2008
Downloads: 370
Quote: 0
Read: Download Dissertation


In this paper polyurethane-acrylics (PU-AC) hybrid latexes were prepared using isophorone diisocyanate, dimethylol propanic acid (DMPA) and polypropylene oxides (PPO, DL1000 and DL2000) as main monomers for PU. Acrylic monomers included butyl acrylate, methyl methacrylate and a crosslinker, trihydroxymethyl propane triacrylates (TMPTA).In a first step, keeping hydroxyethyl acrylate (HEA) at 2% of PU, several ingredients such as surfactants, initiator, DMPA and PU/AC ratio, were varied, and their effects on latex properties were studied. Compared with surfactant free PU-AC latexes, a sharp increase in particle size was observed in latexes done with 0.1% of surfactant regardless of the nature of the surfactants used (anionic, nonionic and anionic with long chain of amphiphilic alkylphenyl polyethoxylate). Further increase in surfactant content, however, led to latexes with smaller particle size and narrower particle size distribution. When amount of the oil soluble initiator, azobisisobutyronitrile (AIBN), was increased, AC monomers conversion increased. It was observed that PPO with long propylene oxides brought about larger particle size, less charge on particle surface and lower tensile strength of films; whereas lower DMPA levels led to latexes also of larger size combined with lower tensile strength of films; AC monomer crosslinker, TMPTA, contributed to reduce particle size, lower particle surface charges and lower tensile strength of films. By increasing AC amount in PU-AC latex, latex particle size significantly increased concomitantly with a remarkable increase in particle surface charges.Secondly, with the purpose to study PU grafting efficiency, PU-AC hybrid latex was prepared using hydroxyethyl acrylate (HEA) as grafting agent. The kinetic of the reaction between OH of HEA and NCO group was studied. It was observed that the reaction between OH and NCO were a second-order reaction, and the reaction rate depended on the amount of HEA rather than on NCO content. By increasing the reaction temperature after addition of HEA, the reacted NCO amount increased and double bonds content kept at a constant value. Butylamine brought about the highest end-capping efficiency. Based on the above results, HEA amounts, soft segment component, PU and AC ratios were varied and their effects on PU-AC grating properties and PU-AC latex properties were studied. It was found that when the amount of HEA increased, the grating efficiency of PU increased accompanied with the decrease of water absorption of the film. By increasing soft segment DL1000 content, particle size of PU-AC latex increased, but PU grafting efficient had no obvious changes. The increase of AC amount contributed to lower AC monomers conversion but PU grafting efficient had no obvious changes.In addition, a new grafting agent,α-allyl glyceroether (AG), which contains two OH and one C=C, was synthesized and characterized by NMR, IR, GC and refraction index. The influence of AG on PU-AC properties was preliminarily studied.

Related Dissertations

  1. Layered the LDHs novel preparation method created its UV barrier properties of the calcined product research,O614
  2. Preparation of the Microencapsulated Disperse Dyes and Dyeing PET Fabric in Absence of Auxiliaries without Afterwashing,TS193.2
  3. N catalyst grain shape Improvement,TQ426
  4. Physiologically compatible Preparation and properties of the membrane,TB383.2
  5. Novel poly N-isopropyl acrylamide copolymer and IPN hydrogels Preparation and properties of,O633.2
  6. Morphology, Particle Size and Size Distribution of Nanocrystallites in Urine and Their Relation to Stone Formation,R691.4
  7. Micron sized spherical silica powder and its technology,TB383.3
  8. Study on the Reaction of PVAc with MDI,O631.5
  9. Ellipsoid -beads -type emulsion polymerization reactor oscillating flow characteristics of,TQ316.334
  10. Study on the Synthesis and Properties of Poly(1,4-Cyclohexyledimethylene Terephthalate) (PCT),TQ323.4
  11. Study on the Synthesis and Properties of Copolyimides Derived from ODPA/Isomeric ODA,TQ323.7
  12. Synthesis and Application of A Novel Series of Cation Hydrophobically Modified Polyacrylamide,TQ323.6
  13. Curing Mechanism and Properties of Fluorenyl Epoxy Resin,TQ323.5
  14. The Research of Synthesis of Bisphenol-A Polycarbonate Through Melt Transesterification Process,TQ323.41
  15. Study on Organic Silicone Modified Epoxy Resins Performance and Preparation of Adhesive,TQ323.5
  16. Modification of Thermosetting Resins by High Performance Liquid Crystalline Epoxy Resin,TQ323.5
  17. Modification of Thermosetting Resins by Polyetherimide,TQ323.7
  18. Study on High Performance Polyphenylene Oxide/Thermosetting Resins,TQ323.5
  19. The Synthesis and Properties Research of High Hydrophilic Polyurethane,TQ323.8
  20. Study on the Green Synthesis of Polycarbonate Urethane,TQ323.8
  21. Ortho - phenyl ether type phenolic resin synthesis and ammonia-free molding compound,TQ323.1

CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polycondensation resin and plastic > Polyurethane (poly carbamate ) and plastic
© 2012 www.DissertationTopic.Net  Mobile