Dissertation > Excellent graduate degree dissertation topics show

A Convenient Approach to the Synthesis of Nonisocyanate Polyurethanes

Author: WangMeng
Tutor: GuYao
School: Qingdao University of Science and Technology
Course: Materials Processing Engineering
Keywords: double metal cyanide polymer quaternary ammonium salt amine-terminated polyether cyclic carbonate nonisocyanate polyurethane epichlorohydrin
CLC: TQ323.8
Type: Master's thesis
Year: 2009
Downloads: 136
Quote: 2
Read: Download Dissertation

Abstract


Polyurethanes obtained from diisocyanates and diols are attractive and important chemical products with extensive application in various fields because of its excellent properties,but traditional polyurethane have some formidable defects such as toxicity, poor hydrolytic stability and insufficient permeability.New generation polyurethane, nonisocyanate polyurethane(NIPU),which shows lower permeability,higher chemical resistance and non-poisonous fabrication process compared with traditional polyurethane,is obtained from multifunctional cyclic carbonates and multifunctional primary polyamines.The synthesis route and conclusion are as follows:1.The polymerization of epichlorohydrin was catalyzed by double metal cyanide (DMC),and then the polymer reacted with tertiary amine to give polymer quaternary ammonium salt.Different reaction conditions were discussed in this two-step reaction and the reaction products were confirmed by NMR analysis.The studies showed that: The induction period and total reaction time get shorter as the concentration of catalyst enhanced,the optimum time of polymerization and quaternization reaction are 110℃and 90℃,respectively.The suitable material ratio of chloromethyl and trimethylamine were 2.5,the cationic degree of polymer quaternary ammonium salt from trimethylamine was higher than that from triethylamine and pyridine.2.A novel amine-terminated polyether(ATPE) was synthesized with two steps. The first was that vic-chlorohydrins-terminated polyether was obtained through high reactive polyether polyols reacting with epichlorohydrin catalyzed by(DMC).The second was that vic-chlorohydrins-terminated polyether(CHTPE) reacting with ammonia to form amine-terminated polyether.We found the rule of graft numbers of epichlorohydrin,and quantitative determined amine value of product to study the effect factors of reaction.Structure of product was signified by using ~1HNMR.When the optimal reaction temperature is 110℃,the ratio of raw is 5:1 and the reation time is 6h,the conversion of ATPE would reach about 90%.3.The cyclocarbonate- terminated polyether(CCTPE) can be obtained by reacting CHTPE with alkali metal hydrocarbonate in the presence of quaternary ammonium catalysts.98%yield of CCTPE was obtained by optimizing reaction condition through choosing different catalysts,solvents,and reaction temperature.~1HNMR and FTIR spectra have been used to analyze target product. The research showed that:the polarity of solvent and the molecular weight and compatibility of phase transfer catalyst have a significant impact on conversion,the viscosity of different stage reaction product have been tested,the order was:CCTPE> CHTPE>HTPE.4.Tri-functionality cyclocarboanate reacted with difunctional primary amine to afford crosslinking network nonisocyanate polyurethanes.All cured products were characterized for their thermal and mechanical properties to find out the effect of carbonate-to-amine ratio and type of amine.The research showed that:diethylamine based NIPU have the most excellent properties,and when carbonate-to-amine ratio is 1:1,the products have the most favorable overall performance.Swelling in toluene show that diethylamine based NIPU have the lowest value because of its highest crosslinking density.

Related Dissertations

  1. Preparation of Epichlorohydrin from Crude Glycerol of Biodiesel By-product,TQ223.26
  2. Preparation and Properties of Cd(Ⅱ)-Imprinted Thiol-Functionalized Micro-Bead Silica Gel Polymer,O631.3
  3. Preparation of Polymethyl Siloxane Fused-silica Capillary Chromatographic Column and Utilization,O634.41
  4. Synthesis and Characterization of Polyether Ionic Liquids,O631.3
  5. Study on the Synthesis of Metalloporphyrins and Their Catalytic Properties in the Coupling Reaction of CO2 and Epoxides,O643.32
  6. Ancient Ink Protection Material and Preservation Environmental Research,K875
  7. Development of IAC-HPLC Method to Determine Sudan Ⅰ,O657.72
  8. Synthesis and Application of Vinyl Chloride-isobutyl Vinyl Ether Copolymer Modified with Nano-SiO2 by Suspension Polymerization in Aqueous Medium,TB383.1
  9. Synthesis of 1,3-disubstituted-2-propanols and Chiral Resolution of Racemic Sibutramine,R914.5
  10. Research on Preparation of Flame Retardant Epoxy Containing-Phosphorus,TQ225.27
  11. Double-Metal Cyanide Complexes for Production of Biodiesel,TE667
  12. Preparation of the Immobilized Trypsin with Calcium Alginate as the Support,Q814.2
  13. Analysis Methods of biodiesel and its fine chemical products,TE667
  14. The benzimidazole ionic liquids and its application in the synthesis of cyclic carbonate,O624
  15. Biological Treatment of Epichlorohydrin Wastewater,X703
  16. Cationic Polymer Synthesis and the Impact on the Stability of Clay,TE258
  17. Organometallic rhenium complex catalyzed epoxy compound Theory,O643.32
  18. Experimental Study for a New Type Anti-calcification Bovine Jugular Venous Conduit,R318.08
  19. Investigation on the Effectiveness of Electrochemical Technology in Industrial Wastewater Treatment,X703
  20. Study on Preparation and Application of Fiber-Based Retention and Drainage Aids for Papermaking,TS727.2

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