Dissertation > Excellent graduate degree dissertation topics show

Surface modification of carbon nanotubes / epoxy composites interfacial structure and properties

Author: CuiWei
Tutor: JieXiaoLin；ZhouXingPing
School: Huazhong University of Science and Technology
Course: Polymer Chemistry and Physics
Keywords: Epoxy Carbon Nanotubes Composites Surface functionalization Interface Modulus match Thermal insulation properties
CLC: TB383.1
Type: PhD thesis
Year: 2011
Downloads: 843
Quote: 1
Read: Download Dissertation

Abstract


Because carbon nanotubes have excellent mechanical properties, thermal properties and electrical properties, resulting in a polymer matrix composite applications have been extensively studied. Carbon nanotubes in a polymer matrix and its poor dispersion of the polymer matrix interfacial interaction between the weak, severely affecting the carbon nanotube / polymer composites to enhance various physical properties, and the surface of carbon nanotubes functionalization is an effective way to solve the problem. This paper uses epoxy resin as a polymer matrix, through the multi-walled carbon nanotubes (MWNT) surface modification, prepared with different types of functionalized multi-walled carbon nanotubes, and the epoxy resin (epoxy) composite, Preparation of functionalized carbon nanotube / epoxy composites, the system of the composite material, the functionalized carbon nanotubes in an epoxy resin matrix with dispersed epoxy matrix and interfacial interactions between the composites of various physical Performance. First, the use of hyperbranched poly (urea - urethane) (HPU) on the surface of MWCNTs were covalently modified, then this surface modification of multi-walled carbon nanotubes (MWNT-HPU) and CYD-128 epoxy compound prepared MWNT-HPU/epoxy composite material. HPU were investigated modification of MWNT composite dispersion conditions, and processing properties of composite materials, bending and dynamic mechanical properties, thermal conductivity, electrical conductivity and thermal stability properties. The results show that by HPU surface functionalization of the MWNT, MWNT improved dispersibility in the epoxy resin and the epoxy resin and the interface between the substrate interactions, such carbon / epoxy uncured suspension system has a better rheological properties, and makes the flexural and dynamic mechanical properties, thermal stability is improved effectively. HPU on MWNT surface modification, but also promoted MWNT and epoxy phonon coupling effects between, thus effectively reducing the interfacial thermal resistance, improved carbon nanotube / epoxy composite thermal conductivity. In addition, MWNT surface modified by HPU, but also effectively shield the electronic transmission of the composite material, giving a higher volume resistivity of the composite value. Secondly, by the sol - gel (sol-gel) method, the successful implementation of silica (SiO2) on the MWNT surface controllable, uniform coating to successfully build a nano-SiO2-coated MWNT coaxial cable hybrid structure ( SiO2 @ MWNT). The SiO2 @ MWNT with CYD-128 epoxy composites were prepared SiO2 @ MWNT / epoxy composites. SiO2 coating were investigated bending of the composite structure and dynamic mechanical properties, thermal conductivity, electrical conductivity and thermal stability properties. Studies show that by coating of SiO2 on MWNT, reducing the effect of agglomeration of carbon nanotubes, promoted in the dispersion of epoxy resin and improve the interface between the MWNT and the interaction between the epoxy resin and improve the composite bending and dynamic mechanical properties, thermal stability. SiO2-coated rigid structure also effectively promote the MWNT with soft epoxy match between the modulus, thereby reducing the interfacial thermal resistance between the two, and thus effectively improve the thermal conductivity of the composites. Meanwhile, the MWNT surface evenly coated SiO2 shell, so that composite material has a high volume resistivity. In addition, by sol-gel method, the success achieved in the MWNT surface of TiO2 coated uniformly controllable, and build a nano-TiO2 coated MWNT coaxial cable hybrid structure (TiO2 @ MWNT), and through the high-temperature calcination, the successful formation of a sharp crystalline TiO2 titanium coating. Finally, the TiO2 @ MWNT with CYD-128 epoxy composites were prepared TiO2 @ MWNT / epoxy composites, and studied the flexural properties, thermal properties and electrical properties. The results show that, TiO2 nanotube coating promotes the epoxy matrix dispersion, effectively improve the flexural strength and modulus. In addition to alleviate MWNT and epoxy matrix between the modulus mismatch, thereby reducing the interfacial thermal resistance between the two outer, crystalline TiO2 shell of its high thermal conductivity also conducive to promoting interfacial heat transfer, thus ultimately makes composite materials thermal performance has improved significantly. Meanwhile, the composite material also has a fairly pure epoxy matrix volume resistivity values.

Related Dissertations

  1. Study on Characteristics of Contiuous Fiber-Reinforced Metal Matrix Composites under Hypervelocity Projectile Impact,TB332
  2. Reactive Hot-Pressing and Mechanical Properties of （ZrB2-ZrO2）/BN Composites,TB332
  3. FPGA/DSP Image Co-processor Technology and Ethernet Data Transmission,TP391.41
  4. Development of the Missile Controller in Servo Systems Based on NIOS II,TP273
  5. Development of LXI Instrument Web Interface,TP274
  6. Development of Vxibus Common Interface Module Based on DSP,TP274
  7. Development of LXI Counter,TP274
  8. Dosimetric Characteristics of Photon Beam in the Medium Interface Region,R815
  9. Curing Mechanism and Properties of Fluorenyl Epoxy Resin,TQ323.5
  10. The Effects of Exposure to Bisphenol-a between Adolescence and Early Adulthood on Behaviors in Mice and Its Molecular Mechanism,R965
  11. Carbon Nanotubes Compound Polymer Film Modified Electrode and Its Application for Electroanalytical Chemistry,O657.1
  12. The Identification of Fault Type in Transmission Lines Based on Neural Network,TP183
  13. Characteristics of sensory stimulation evoked,R318.0
  14. MWCNTs and ZnO / SnO 2 Composites and NO gas research,TB33
  15. A New Experience of Interaction,TP11
  16. The Optimization Design and Research to Wet Coal Dryer Mechinery Control System,TP273
  17. Internet IP-level topology measurement space research,TP393.08
  18. The Development and Corrosion Resistance of Chromium Electroplating Sealing Agent,TG174.42
  19. The Research and Design of EIB Smart Home Gateway,TP393.05
  20. Research and Implementation of the Techniques of Embedded Network Video Applications,TP368.1
  21. The Design and Implementation of a Game Interface Interaction on Mobile Phone,TP311.52

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