Dissertation > Excellent graduate degree dissertation topics show

Synthesis and Characterization of High Strength Polyimides

Author: HuangChaoBo
Tutor: HouHaoQing
School: Jiangxi Normal University
Course: Polymer Chemistry and Physics
Keywords: Polyimide Nanofiber Mat Dynamic Mechanical Analysis High Performance Processability
CLC: O633.22
Type: Master's thesis
Year: 2006
Downloads: 361
Quote: 1
Read: Download Dissertation

Abstract


This dissertation consists of two parts:Part one: A series of high molecular weight polyimide (PI) precursors, poly(p-phenylene biphenyltetracarboxamic acid) (BP-PAA), were synthesized from 3, 4, 3’,4’- biphenyltetracarboxylic dianhydride (BPDA) and p-phenylenediamine (PDA) by using intense mechanical stirring at the low temperature. The highest intrinsic viscosity, 7.6 dL/g, was measured by using the precursor BP-PAA synthesized in the condition of 10% by weight reacting substances in DMAc and at -5℃. Nanofibers of poly(p-phenylene biphenyltetracarboximide) (BP-PI) was obtained by electrospinning the solution of BP-PAA in DMAc and imidizing the as-electeospun BP-PAA nanofibers. The average diameter of the PI nanofibers was about 200 nm.The imidization condition of converting BP-PAA into BP-PI was investigated by using FT-IR spectroscope and by establishing relationships between the imidizing temperature as well as staying time at different temperature and the mechanical performance of PI film. The result showed that when molecular weight was no significant different, the higher the imidization degree of BP-PAA, the better the mechanical performance of the BP-PI film was. The highest tensile strength and modulus were respectively 960 MPa and 20.1 GPa for BP-PI film and 650 MPa and 15 GPa for electrospun BP-PI nanofiber mats or membranes. In addition, the heating-resistance of the BP-PI was measured to be 565°C in air and 603°C in nitrogen by 5% by weight degradation. Dynamic mechanical analysis of the PI film showed that the glass transition temperature and storage modulus of BP-PI thin filmswere respectively 330℃ and more than 18 GPa.Part two: a series of similar high molecular weight PI precursors, poly(p-phenylene biphenyltetracarboxamic-co-oxydiphthaldicarboxamic acid) (BOP-co-PAA) were synthesized from 3, 4, 3’,4’- biphenyltetracarboxylic dianhydride (BPDA) ,4,4’- oxydiphthalic anhydride (ODPA) and p-phenylenediamine (PDA) at low temperature. The as-synthesized PI precursor solution was used to make BOP-co-PI thin films by solution-cast and consequent heat imidization.Mechanical performance of BOP-co-PI showed that the elongation to break of

Related Dissertations

  1. Development of Pxibus High Performance Digital I/O Module,TP274
  2. Synthesis and Resolution Property of N-(9-Fluorenylmethoxycarbonyl)-D-Tryptophan and D-Phenylalanine Imprinted Polymer,O631.3
  3. The Study on Rhinoceros Horn and Its Imitation,TS932.2
  4. Fast Determination Method Research of Bisphenol A in Food Packing Material,TS206.4
  5. Study on Synthesis of Polysaccharide Tris (Phenylcarbamates) Derivatives as Chiral Stationary Phases (CSPs) and Estimation of Their Resolution Abilities,TQ460.1
  6. Study on Synthetic of BINOL, Amino Acid and Derivatives Molecularly Imprinted Polymers and Their Application in the Chiral Resolution,O631.3
  7. Synthesis and Application of Monomethyl Maleate Polycarboxylate Superplasticizer,TU528.042.2
  8. Study on the Determination of Domoic Acid by High Performance Liquid Chromatography-Tandem Mass Spectrometry in Shellfish and the Distribution and Metabolism of Toxin Mice,R114
  9. The Comparative Study of Two Deproteinized Methods on Xenogeneic Bone Graft Substitute Material,R687.3
  10. The Fingerprints Establishment and Preliminary in Vitro Metabolism of Shuanghuanglian Powder-Injection and Oral-Liquid,R286
  11. Research and design of high-performance clock driver circuit,TN79
  12. Determination of Catecholamines and Nitroanilines Using High-performance Liquid Chromatography Combined with Solid-phase Extraction,O657.72
  13. Preparation of Temperature-responsive Monolith Column and the Study of Its Chromatographic Performance,O657.7
  14. The Research of High-performance Computing Course Based on Case-task Driven Teaching Method,TP338-4
  15. High-performance work systems and organizational performance,F272.92
  16. Studies on the Pretreatment and Determination Methods of HPLC in Analysis of Residues of Pencillin Antibiotics,S859.84
  17. Effects of Sympathetic Histamine on Vasomotor Responses of Blood Vessels in Rabbit Ears,R341
  18. New amine fluorescent reagents in high-performance liquid - Mass,O657.72
  19. Preparation and Its Gasoline Desulfurization of Polyimide Membrane,TE624.55
  20. Research and Implementation of the Registration Center in the Enterprise Grid Computing System,TP393.18
  21. Building efficient campus network application technology research,TP393.18

CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Miscellaneous Chain Polymers > Nitrogen-containing polymer chain > Polyamide
© 2012 www.DissertationTopic.Net  Mobile