Dissertation > Excellent graduate degree dissertation topics show

Atomic Oxygen Erosion Effect Analysis and Protective Research on Polymer Materials

Author: ZuoYong
Tutor: GaoYuan
School: Yantai University
Course: Analytical Chemistry
Keywords: Atomic oxygen (AO) polymer materials solvothermal plasma polymerization silica film
CLC: O631
Type: Master's thesis
Year: 2013
Downloads: 46
Quote: 0
Read: Download Dissertation

Abstract


Atomic oxygen （AO） is the predominant and the most active component of low earthorbit （LEO） atmosphere. Polymer materials may fail to function due to the AO erosion,thus endangering aerospace machine life. From the perspective of material analysis, wesystematic studied the atomic oxygen erosion effect of polymethyl methacrylate （PMMA）and silicon rubber. To retard the AO erosion effectively, we tried to prepare SiOxfilms onthe surface of polymethyl methacrylate （PMMA） and silicon rubber by solvothermalmethod and plasma polymerization, respectively. The preparation conditions anddefending effect of films were studied. Main results were as follows:（1） The atomic oxygen erosion effect of PMMA was analyzed. The mass loss, surfacemorphology and structure, transmittance of PMMA before and after AO exposurewere investigated. The results indicated that PMMA was eroded seriously after AOexposure to a fluency of3.3×1020atoms/cm2. The surface morphology andstructure of pristine PMMA obviously changed and optical transmittance markedlydecreased.（2） The atomic oxygen erosion effect of silicon rubber was analyzed. The surfacemorphology and structure, transmittance of three different silicon rubbers wereinvestigated. The total mass loss of silicon rubbers in vacuum was measured. Theresults indicated that the interaction between AO and silicon rubbers led to thedecrease of optical transmittance. Irregular cracks appeared on the surface andsurface materials peeled off.（3） Using solvothermal method to modify the surface of polymethyl methacrylate（PMMA）, the silica films were prepared on it via sol solution and solvothermaltreatment. The interfacial effect between film and PMMA substrate in thesolvothermal process was studied. The samples were irradiated by atomic oxygen（AO） in a ground-based simulation system, and the surface morphology andstructure of films were investigated. The results indicated that solvothermal process is an effective method to improve the adhesion between the silica film andsubstrate. After AO exposure, the inorganic silica components increased due to theoxidation of organic silicon substances.The silica films become more compact,without peeling off, and has good optical transparency.（4） Gradient thin films were deposited on the surface of silicone rubber by plasmapolymerization. The surface morphology and structure of films before and afterAO irradiation were studied. The results indicated that gradient deposition couldimprove the adhesion between film and substrate. The plasma polymerized coatingwas uniform and smooth. The transmittance and AO resistance of substrate wereimproved.

Related Dissertations

  1. Of Bi N Co-doped TiO \u003csub\u003e 2 \u003c/ sub\u003e of the preparation and performance,O614.411
  2. IVA metal chalcogenides Solvothermal Synthesis and Structure,O611.4
  3. Ceria -based materials Preparation and Characterization of Its Properties,TB383.1
  4. The Solvothermal Syntheses and Characterizations of Transition Metal-contained Chalcogenidoarsenates,O611.4
  5. Fabrications and Applications of Microelectrode Array of Silicon Dioxide Cavities and Magnetic Ferroferric Oxide Nano-Bioconjunctions,TB383.1
  6. Visible oxide catalyst with high activity and mechanism of Design and Synthesis,O643.36
  7. Fabrication, Modification and Drug Delivery Application of Hollow Magnetic Particles,TB383.1
  8. Electro-assisted Self-assembly and Properties of Silica Films,TB383.2
  9. Solvothermal system ATRP of MMA,TQ316.3
  10. YAG: Ce 3 Preparation and luminescent properties of phosphor,TQ422
  11. Lithium iron phosphate cathode material for the synthesis and modification of polymer -coated,TM912
  12. Design and Synthesis of Graphene-Based Composites for Supercapacitor Application,TM53
  13. Synthesis and Characterization of Microporous / Mesoporous Molecular Sieves,O643.36
  14. Morphology Controlled Synthesis, Characterzation and Iuminescent Properties Investigation of Several Compounds Micro/nanostructures,TB383.1
  15. Single - source precursor prepared oxides and sulfides nanomaterials,TB383.1
  16. The Solvothermal Preparation of Carbon Microspheres and the Application in Modifiding Electrode,O646.54
  17. Amino Acids-Assisted Synthesis of Nanomaterials and Their Novel Properties,TB383.1
  18. Preparation and Characterization of Ordered Mesoporous CMK-5 and MWNTs/metal Sulfide Composites,TB383.1
  19. Solvothermal Synthesis of Nano-or Micro-sized Magnetic Materials,TB383.1
  20. Synthesis and Characterization of Low-dimensional Bismuth Using Chemical Methods,TB383.1
  21. Hydrothermal Preparation of Copper-based Magnetic Nanostructure and the Study of Its Magnetic Behavior,TB383.1

CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers
© 2012 www.DissertationTopic.Net  Mobile