Dissertation > Excellent graduate degree dissertation topics show

Studies on Toughening of Epoxy Resin by Useing a Polymer with Active Epoxy Groups

Author: LiXiShun
Tutor: NiCaiHua
School: Jiangnan University
Course: Materials Science
Keywords: Reactivity ratio Epoxy Toughened Modified Curing kinetics Toughening mechanism
CLC: TQ323.5
Type: Master's thesis
Year: 2011
Downloads: 119
Quote: 0
Read: Download Dissertation

Abstract


Used in this study were synthesized by free radical polymerization of n-butyl methacrylate (nBA) and glycidyl methacrylate (GMA) copolymer PBG, by varying the monomer feed ratio of two (nBA and the molar ratio of GMA 10/1, 9/1 and 8/2) to obtain a series of copolymer product: PBG1, PBG2 and PBG3. For copolymerization two monomer reactivity ratios were studied by infrared spectroscopy, nuclear magnetic resonance spectroscopy ( 1 HNMR, 13 CNMR) carried out on the polymer structure characterized by gel permeation chromatography (GPC) determined the molecular weight of the polymer, the epoxy groups in the molecule of the copolymer of the epoxy value was measured. The polymers synthesized in the above modified epoxy resin, respectively, with different copolymer, i.e.: PBG1, PBG2 and PBG3, according to the added amount (weight ratio of the copolymer and the epoxy resin were 5/100 , 10/100, 15/100, 20/100 and 25/100), and the epoxy resin composition of a mixed system of PBG. Studies of polymer type and polymer in epoxy resin content on the cured epoxy resin properties. Determination of the impact strength of the cured epoxy resin, tensile strength and elongation and other mechanical properties of the copolymer investigated the effect of toughening the epoxy resin. While after curing the epoxy resin thermal properties such as: glass transition temperature, Vicat softening temperature, heat loss were studied. Scanning electron microscopy morphology of the cured epoxy resin. In this work, two different types of modified epoxy resin were studied, namely liquid epoxy resin E-44 and powder epoxy E-663. Experimental results showed that: the two types of copolymer resin has a good modification effect, the selection of polymer PBG2, when the content ratio of 5/100-10/100 modified to get the best results. Epoxy T g a significant increase, the heat capacity of deformation also increased. Scanning electron microscopy findings: After adding the copolymer varies epoxy fracture surface, indicating its toughened epoxy realized. The curing kinetics were studied by changing the heating rate during the curing, the curing of several curves obtained. According to the data obtained, respectively, with Kissinger and Ozawa equation curing reaction activation energy was calculated to explore the curing mechanism. This work resulting copolymer toughening for epoxy resins have relatively good results, the reason is: n-butyl methacrylate, poly (nBA) soft segments in the molecule can effectively increase the epoxy resin toughness, while in the copolymer in the curing reaction of epoxy groups in the epoxy resin to form a number of anchor body, weaken the degree of epoxy resin brittle fracture, and thus has a good modification effect. This work for epoxy toughening in the theory and application of some significance.

Related Dissertations

  1. Study on Preparation of Composite Cross-linked Modified Modified Potato Starch,TS236.9
  2. Coupled Dynamics of Excitable Systems Base on Morris-Lecar Model,Q42
  3. Under microaerobic conditions closed calcium carbide furnace exhaust COS gas adsorption purification,X781
  4. Synthesis of Polysulfones and Modification for Epoxy Adhesives,TQ433.437
  5. Synthesis and Application of A Novel Series of Cation Hydrophobically Modified Polyacrylamide,TQ323.6
  6. Preparation and Anticorrosion Properties of Doped Polyaniline/Epoxy Coating,TQ637
  7. Study on the Synthesis and Adsorption Behaviour of Chitosan Derivative,TS254.9
  8. Modification and Application of the Waste Fluorgypsum and the Treating of High Concentrations Fluoride Wastewater,X703
  9. Adsorption Effects of Phosphate and Chromium from Aqueous Solution by Adsorption Using LDH and Mg/Fe/Al Modified Montmorillonites,X703
  10. Study on Detection of Transgenic Ingredients in Genetically Modified Cottonseed Meal and Its Degradation during Feed Processing,S816
  11. Genetically Modified Food Ethics,B82-05
  12. Integrable Discretizations to a Class of Soliton Equations,O175.2
  13. Studies on Construction of Specific Gland Expressional Vector of HLF and Modified Fibroblast Cell Line,Q78
  14. Curing Mechanism and Properties of Fluorenyl Epoxy Resin,TQ323.5
  15. Preparation, Characterization and Application of Prussian Blue Composite Nanomaterials,TB383.1
  16. An Analysis on Consumers’ Cognition and Attitudes of Genetically Modified Edible Oil,F426.82
  17. Study on Quality Change and Prediction Model for Shelf-life of Chilled Pork,TS251.4
  18. Soil Erosion Simulation in Hilly Area of South China,S157
  19. The Research of Emergent Dispose for Organic Liquid Spills by Modified Bentonites,X703
  20. Establishment of Transgenic Soybean, Maize and Wheat Informationg Platform and Effect of Transgenic Soybean on Soil Microorganisms,S565.1
  21. Effects of Modified Ultrafiltration on Aquaporin 1 in Cardiopulmonary Bypass,R654.2

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