Dissertation > Excellent graduate degree dissertation topics show

New polyurethane nanocomposites preparation, structure and properties of

Author: GuoShuZhong
Tutor: LiuTianXi
School: Fudan University
Course: Polymer Chemistry and Physics
Keywords: Nanocomposites Multi-walled carbon nanotubes Layered double hydroxides Fudan University Structure and Properties Polyurethane Elastomer Elongation at break Polysiloxane Isocyanate
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 343
Quote: 1
Read: Download Dissertation

Abstract


Polyurethane (PU) elastomers are a cross between rubber and plastic elastic material, with both high elasticity of rubber, but also has a high-strength plastic. Its wear resistance, biocompatibility and blood compatibility particular. It also has excellent oil resistance, impact resistance, low temperature resistance, ozone resistance, radiation resistance and weight-bearing insulation, and insulation. As superior overall performance and is widely used in civil, sports, aerospace, military and other fields, to become an important and indispensable materials. But because of its strength, biocompatibility, heat and oxidation performance is also not ideal, its application is limited to a certain extent. To further broaden its application field, researchers usually some nanoparticles added to the system to improve the performance of some of the polyurethane material. In this paper, the polyester polyol (PDA), isophorone diisocyanate (IPDI), isophorone diamine (IPDA) system, the prepolymer prepared using three different polyurethane nanocomposite system, and structure and properties were studied in detail, the main research results obtained are as follows: (1) a combination of in-situ polymerization and solution casting method to prepare polyurethane / multi-walled carbon nanotubes (MWNT) composite materials. As can be seen by scanning electron microscopy, when the low levels of carbon uniformly dispersed in the polyurethane tube in the body, and the carbon nanotubes between the polymer body and the carbon nanotubes have a strong interfacial interaction force (by the embedded in the polyurethane matrix is ??pulled off the morphology of carbon nanotubes), which is conducive to the stress transmitted from the polymer to the carbon tube body, while maintaining a high elongation at break under the premise of having excellent mechanical successfully prepared nanocomposite tensile strength, and this The thermal stability is also improved significantly. (2) synthesized by RAFT polymerization of a range of different molecular weights of PU-b-PTPM (PTPM, poly [3 - (trimethoxysilyl) propyl acrylate]) amphiphilic block copolymers, such copolymers in THF / methanol mixed solvent can self-assemble into the shell with PU to hydrophobic PTPM for the nuclear nuclear - shell structure, and then through the hydrolysis and condensation catalyst synthesis PU / silsesquioxane ball nanocomposites. By the tensile test, TGA and atomic force microscopy study found that compared to pure polyurethane resin, the mechanical properties of the resulting composite material properties and thermal stability were significantly increased; and with the block polymer molecular weight increase, an increasing number of available , the size of uniform silsesquioxane nanoparticles. (3) dodecyl sulfonate anions CoAl-layered double hydroxide (LDH) for intercalation and were first prepared by in situ polymerization of exfoliated polyurethane / CoAl-LDH nanocomposites. Using X-ray diffraction, tensile test, thermal gravimetric analysis, real-time Fourier transform infrared spectroscopy by means of nanocomposite structure / morphology, mechanical properties, thermal stability, and found that its thermal oxidation and mechanical performance was significantly better than the pure polyurethane resin.

Related Dissertations

  1. Urothermal Synthesis, Structure and Characterization of Functional Coordination Polymers,O631.3
  2. Synthesis and Biocompatibility of different types of hydrophilic surface - modified polyurethane,R318.08
  3. Adsorption Effects of Phosphate and Chromium from Aqueous Solution by Adsorption Using LDH and Mg/Fe/Al Modified Montmorillonites,X703
  4. 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
  5. Research on PSA/Cotton Blend Fabric of Coatinging of Water Resistance and Moisture Permeability,TS195.6
  6. Prototype Development of Intimate Apparel Mannequin,TS941.2
  7. Synthesis and Properties of the new anti-clotting material in modified ammonium phosphate zwitterion,R318.08
  8. Preparation and Application of Water-based Polyurethane to Improve Wet Rubbing Fastness,TS193.2
  9. Effect of Reinforcing Materials on the Properties of Nitrile Butadiene Rubber,TQ333.7
  10. Amine metal compound synthesis, structure and reactivity,O627
  11. 1,3 - propanediamine shrink o-vanillin 3d-4f heteronuclear bimetallic complexes synthesis, structure and properties of,O627.3
  12. MWCNTs and ZnO / SnO 2 Composites and NO gas research,TB33
  13. Poly(L-lactide) Nanocomposites Containing Octaglycidylether Polyhedral Oligomeric Silsesquioxane: Prepartion, Structure and Properties,R318.08
  14. A Density Functional Theory Study for Wn C0,± （n=1-6） Clusters,O641.1
  15. Syntheses, Structures and Properties of Metal-organic Coordination Polymers Based on Long-Chain Aromaticmulticarboxylate,O631.3
  16. Study on Preparation and Properties of Polyimide/SiO2 Hybrid Films,TB383.2
  17. Preparation and Characterization of Multifunctional Fe3O4/ZnO/SiIO2 Nanocomposites,TB383.1
  18. Multigenerational Hyperbranched Waterborne Polyurethane Synthesis and Characterization of Structure and Properties,O631.3
  19. The Synthesis and Properties Research of High Hydrophilic Polyurethane,TQ323.8
  20. Synthesis of Silver Nanoparticles on Modified Multi-walled Carbon Nanotubes and Their Antimicrobial Effects,TB383.1
  21. Non-phosgene Synthesis of Polyurethane Elastomer,TQ334.1

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