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TITLE
DEDICATION
CERTIFICATE
DECLARATION
GLOSSARY OF TERMS
CONTENTS
ACKNOWLEDGEMENT
PREFACE
1. INTRODUCTION
1.1 Architectural variations in block copolymers
1.2 Synthetic method
1.3 Application of block copolymers as thermoplastic elastomers (TPEs)
Fig.1.3 Model of a typical domain structure
1.4 introduction to polyurethane chemistry
1.5 Polyurethane elastomers (PUEs)
Fig.1.4 Schematic representations of the structure of (a) segmented PUs and (b) two phase structure of the polymer
1.6 Solution behaviour of PU block copolymers
1.7 Transport properties in polymers
1.8 Transport properties in PU block copolymers
1.9 Thermoplastic elastomers based on natural rubber
1.10 Scope of the present work
1.11 Objectives of the present work
2. EXPERIMENTAL
2.1 Materials
2.2 Experimental
2.3 Characterisation
3. RESULTS AND DISCUSSION
3.1 Synthesis and characterisation of PU oligomers
3.1.1 Preliminary synthesis
3.1.2 Specific synthesis
3.2 Synthesis of (NR/PU) block copolymers
3.3 Characterisation of (NR/PU) block copolymers
3.3.1 IR analysis
3.3.2 NMR analysis
3.3.3 Differential scanning calorimetric (DSC) analysis
3.3.4 Thermogravimetric analysis (TGA)
3.3.5 Tensile properties
3.3.6 Scanning electron microscopic (SEM) analysis
3.3.7 Solubility testing
3.4 Etching studies on (NR/PU) block copolymers
3.4.1 Quantitative etching studies
3.4.2 IR analysis of sol-gel fractions
3.4.3 DSC analysis of sol-gel fractions
3.4.4 TG analysis of gel fractions
3.4.5 SEM analysis of etched samples
Fig.3.23 SEM micrographs of; (a) (NR/PU) -1, (b) gel fraction from toluene, (c) gel fraction from THF
Fig.3.24 SEM micrographs of (a) (NlUPU) -3, (b) gel fraction from toluene, (c) gel fraction from THF
Fig.3.25 SEM micrographs of; (a) (NR/PU) -5, (b) gel fraction from toluene, (c) gel-fraction from THF
3.5 Transport studies on (NR/PU) block copolymers
3.5.1 Mechanism of sorption
3.5.2 Diffusion coefficient (D)
3.5.3 Sorption coefficient (S)
3.5.4 Permeation coefficient (P)
3.5.5 Arrhenius parameters
3.5.6 Thermodynamic parameters
3.5.7 Sorption kinetics
3.5.8 The effect of NCO/OH ratio on transport behaviour
3.5.9 Molecular parameters from swelling studies
3.6 Synthesis and characterisation of soluble (NR/PU) block copolymers
3.6.1 Characterisation
4. SUMMARY AND CONCLUSION
4.1 Synthesis of PU oligomers
4.2 Synthesis of the block copolymers
4.3 Characterisation of the block copolymers
4.4 Synthesis and characterisation of soluble block copolymers
REFERENCES
APPENDIX
List of Publications
Symposia papers