I=
Pakistan Research Repository Home
 

Title of Thesis

Synthesis, Development And Characterization Of Some Advance Matrix Materials

Author(s)

Amir Badshah

Institute/University/Department Details
Department Of Chemistry / Quaid-i-azam University, Islamabad
Session
2012
Subject
Organic Chemistry
Number of Pages
114
Keywords (Extracted from title, table of contents and abstract of thesis)
Characterization, Materials, Synthesis, Advance, Development, Matrix

Abstract
Phthalonitrile resins are high temperature thermosetting polymers, which are considered ideals materials for marine, aerospace, and electronic applications.The synthesis of phthalonitrile monomers with self-catalyzing nature and with large processing window – defined as the temperature between the melting temperature of the monomer and the gelation temperature of the polymer network–, are gaining much more importance because of ease in processability and high thermal stability.In the present study, some novel phthalonitrile resins were synthesized using ortholinked phthalonitrile monomers and self-catalyzing phthalonitrile monomers with different linkages such as: ether, imide-ether, and amide-ether between the reactive ends. All the synthesized monomes were characterized by spectroscopic techniques such as FT-IR, 1H-NMR and 13C-NMR.FT-IR indicated absorption peaks around 1522 and 1355 cm-1 and around 1010 cm-1 indicated the formation of triazine and phthalocynine rings (heterocyclic rings formed as a result polymerization) respectively after post curing.The thermal analyses were carried using DSC, TGA, DMA, and Rheometery.DSC and rheometric studies showed that the monomers with ortho linkages have low melting point and high crosslinking temperature. In self-catalyzed monomers, the monomers having amino group at ortho position or 1,2-linked (ortho) monomers have broad processing window.The complex viscosity (η*) was very low (<1 Pa.s) in between melting and the crosslinking temperature, which is highly suitable for resin transfer molding, resin infusion molding, and filament winding. TGA studies revealed that the resin synthesized from the monomer with heterocyclic ring shows high thermal stability and residual mass (char yield).The thermal stability of the polymer having ether or imide-ether linkages are nearly the same but more than the polymer having amide-ether linkage, indicating the effect of crosslinking density and structural changes. DMA measurements showed that storage muduli (E') and glass transition temperature (Tg) enhance with the increase of curing temperature.These meaurements also indicated that the polymers having imide-ether and amide-ether linkages have higher storage moduli than the polymers have only ether linkages.

Download Full Thesis
1,266 KB
S. No. Chapter Title of the Chapters Page Size (KB)
1 0 CONTENTS

 

 
106 KB
2

1

INTRODUCTION

1.1 Composite materials
1.2 Matrix materials
1.3 Polymer matrix materials

1
218 KB
3 2 REVIEW OF LITERATURE

2.1 Phthalonitrile Resins Based on Non-Catalyzed Monomers
2.2 Phthalonitrile Resins Based on Self-catalyzed Monomers
2.3 Plan of Work

23
200 KB
4 3 RESULTS AND DISCUSSION

3.1 Reagents and Solven
3.2 Instrumentation
3.3 Synthesis of Monomers
3.4 Synthesis of polymers

42
208 KB
5

4

EXPERIMENTAL

4.1 Synthesis of Diol-based Pthalonitrile Monomers (1d–f)
4.2 Synthesis of 4-[(4-aminophthalimidyl)phenoxy]phthalonitriles
4.3 Synthesis of 4-amino-N-[(3,4-dicyanopheoxy)phenyl]benzamides
4.4 Syntheses of Prepolymer and Polymer of Diol based Monomers(P1d–f)
4.5 Syntheses of Polymer of Self-catalyzed Monomers
4.6 Thermal Analyses of Prepolymers and Polymers
4.7 Conclusions

56
904 KB
6 5 REFERENCES

 

91
156 KB