Dissertation > Excellent graduate degree dissertation topics show

Preparation and Properties of PI/SiO2-Al2O3 Nanocomposite Films

Author: WangXiaoLin
Tutor: ZhouHong
School: Harbin University of Science and Technology
Course: Materials Science
Keywords: polyimide silica alumina silane coupling agent compatibility
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 108
Quote: 0
Read: Download Dissertation

Abstract


Polyimide （PI） has been widely used in electrical engineering, aerospace and microelectronic industries because of their outstanding dielectricity, mechanical, and thermal properties. In recent years, a number of studies have been conducted on preparation and general performance of PI by different workers at home and abroad. In order to improve properties of PI, methods of doped inorganic oxide into PI have been widely studied. However, the compatibility between PI and inorganic oxide still needs to be improved.In this paper, （3-aminopropyl）trimethoxysilane （APTMOS） was modified by reacting with pyromellitic dianhydride（PMDA）. Then, PI/SiO2 and PI/Al2O3-SiO2 composite films were prepared by sol-gel with 4,4’-oxydianiline diamine （ODA） and pyromellitic dianhydride （PMDA） as monomer, N,N-dimethyl acetamide （DMAc） as solvent, SiO2 collosol, Al2O3 collosol and modified APTMOS as dopant. The composite films have been characterized by Fourier transform infrared spectroscopy （FTIR） and scanning electron microscope （SEM）. The results showed that the size of inorganic particles in PI composite films was obvious decreasd by adding modified APTMOS. Properties of the composite films were measured by dielectric breakdown strength, corona-resistance time and dielectric spectra. Influence of modified APTMOS on properties of the composite films and the relations between properties and contents of the doped inorganic oxide contents were studied. The results revealed that the dielectric breakdown strength of PI/SiO2 composite films was 326kV/mm with SiO2 content of 20wt%, which was 1.5 time than that of pure PI films. Corona-resistance time of PI/SiO2 composite film with SiO2 content of 20wt% was 26.4h, which was 14 times than that of pure PI films. Dielectric breakdown of PI/Al2O3-SiO2 composite film with Al2O3 content of 10wt% was 242kV/mm. Corona-resistance time of PI/Al2O3-SiO2 composite film with Al2O3 content of 5wt% was 3.9h. Decomposition temperature of PI/Al2O3-SiO2 composite film with Al2O3 content of 20wt% was the maximum.

Related Dissertations

  1. Synthesis and Biocompatibility of different types of hydrophilic surface - modified polyurethane,R318.08
  2. The application of nanotechnology in the field of anti - coagulation of biological materials,R318.08
  3. Synthesis and properties of new functionalized graphene oxide drug carriers,TQ460.4
  4. Study on the Resource Utilization and Adsorbability of Silica Fume,X703
  5. Injection with four commonly cefathiamidine Compatible Stability of transfusion,R942
  6. Amiodarone Hydrochloride Injection Compatible Stability of,R942
  7. 1,4 - bis (4 - amino-2 - (trifluoromethyl) phenoxy ) benzene -type Schiff base imide copolymer synthesis and characterization,O631.3
  8. Lithium anode material calcined alumina crucible Development,TQ174.6
  9. Preparation of Phenol Molecularly Imprinted Polymers on the Surface of Silica and Its Application in DGT Technique,O621.2
  10. Chinese Linux Standard -compliant testing and certification system,TP316.81
  11. Study on the Synthesis and Properties of Organic Silicone Modified Waterborne Polyurethane,TQ323.8
  12. Short pore Pd/Zr-Ce-SBA-15 Catalyst and Its Catalytic Performance VOCs,X511
  13. The Basic Research of Properties of All-ceramic Restoration Bonded by Resin Cement and Color Properties of the Resin,R783.1
  14. Qiantang Medical School of Medication Side Characteristics of the System,R249
  15. Line cutting waste slurry preparation and Modification of Silica,TQ127.2
  16. Synthesis Study and Property Research on Reactive Endcapped Imide Oligomers,TQ323.7
  17. Different morphologies SiO_2 Nanomaterials and fluorescent particles are used for the detection of E. coli,TB383.1
  18. Fabrication and Characterization of CNT Buckypaper Reinforced PMR-Type Polyimide Composite,TB332
  19. Research on Broadband Wire Antennas Used for EMC Tests,TN820
  20. Vacuum circuit breaker module power system electromagnetic compatibility and reliability design,TM561.2
  21. Based on high-sensitivity Raman scattering enhancement Au-SiO 2 Multilayer nanostructure analysis and preparation of liquid substrates,TB383.1

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