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  • TITLE
  • DEDICATION
  • CERTIFICATE
  • DECLARATION
  • ACKNOWLEDGEMENT
  • ABBREVIATIONS
  • CONTENTS
  • 1. INTRODUCTION AND OBJECTIVES
  • 2. SWELLING AND SOLVATION PROPERTIES OF CROSSLINKED COPOLYMERS: AN OVERVIEW.
  • 2.1. Swelling and Solvation Studies on Polyacrylamide and Polystyrene Networks.
  • 2.1.a.Cyclization and Multiple Cross linking
  • 2.1.b.Inhomogeneity
  • 2.1.c. Heterogeneity
  • 2.2. Swelling of Polymer Networks - Theoretical Treatment
  • 2.2.a.Unconstrained Network Models.
  • 2.2.b.Flory - Rehner Theory
  • 2.3. Swelling Parameters
  • 2.3.a.Solubility Parameter and Cohesive Energy Density
  • 2.3.b.Solubility Parameter of Solvent Mixture.
  • 2.3.c. Polymer - Solvent Interaction Parameter
  • 2.4. Encapsulation and controlled Release in Organized Networks.
  • 2.4.a.Micro Encapsulation
  • 2.4.b.Encapsulation - Importance and Application
  • 3. HYDROGELS AND THEIR SOLVATION BEHAVIOUR; RESULTS AND DISCUSSION
  • 3. l. Introduction
  • 3.2. The Concept of Swelling and Solvation - Theoretical Treatment
  • 3.3. Swelling Studies in Acrylamide Based Polymers.
  • 3.3.1 Divinyl Benzene - Crosslinked Polyacrylamide
  • 3.3.1.a.Swelling Studies of DVB Cross linked Polyacrylamide
  • 3.3.1.b.Molecular Weight Between Cross links for DVB Cross linked Polyacrylamide
  • 3.3.1.c.Effect of Polymerisation Condition on Swelling Behaviour.
  • 3.4. Hexanedioldimethacrylate cross linked Polyacrylamide
  • 3.4 1.Swelling Studies of Hexanedioldimethacrylate Cross linked Polyacrylamide
  • 3.4.2.Molecular Weight between Cross links for Hexanedioldimethacrylate Cross linked Polyacrylamde
  • 3.5 Swelling Studies in Styrene Based Cross linked Polymers.
  • 3.5.1.Divinyl Benzene Cross linked Polystyrene.
  • 3.5.1.a.Swelling studies of DVB Cross linked Polystyrene
  • 3.5.1.b.Molecular Weight Between Cross links for DVB Coss linked Polystyrene
  • 3.5.1.c.Effect of Polymerisation Condition on Swelling Behaviour
  • 3.5.2.Hexanedioldimethacrylate Crosslinked Polystyrene
  • 3.5.2. a. Swelling Behaviour of Hexanediol dimethacrylate Cross linked Polystyrene
  • 3.5.2.b.Molecular Weight Between Cross links for Hexanedioldimethacrlate Crosslinked Polystyrene
  • 4. ENCAPSULATION AND CONTROLLED RELEASE IN CROSSLINKED POLYMERIC MATRICES AND THE SWELLING BEHAVIOUR OF HOST - GUEST ASSEMBLIES.
  • 4.1. Introduction
  • 4.2. The concept of Encapsulation and Controlled Release - Theory
  • 4.3. Guest - Encapsulated Polyacrylamide Hydrogels.
  • 4.3.1 Benzoic acid Encapsulated DVB Cross linked Polyacrylamides.
  • Fig. 4.2 Scanning electron micrographs
  • 4.3.1.a.Release of Benzoic Acid from Guest Encapsulated DVB Cross linked Polyacrylamide.
  • 4.3.1.b. Swelling Behaviour of Guest Encapsulated DVB Cross linked Polyacrylamide.
  • 4.3. l.c.Molecular Weight Between Crosslinks for the Guest Encapsulated AA - DVB Copolymer
  • 4.3.2 Guest Encapsulated Hexane Diol Dimethacrylate Crosslinked Polyacrylamide.
  • 4.3.2.a.Release Studies of Guest Encapsulated HDDMA Crosslinked Polyacrylamide.
  • 4.3.2.b. Swelling Behaviour of Benzoic acid Encapsulated HDDMA Crosslinked Polyacrylamide
  • 4.3.2.c.Molecular Weight Between Cross links for Guest Encapsulated HDDMA Crosslinked Polyacrylamide.
  • 4.4. Guest Systems Encapsulated in Polystyrene Networks.
  • 4.4.1.Guest Encapsulated DVB Cross linked Polystyrene
  • Fig. 4.12. Scanning electron micrographs
  • 4.4.1.a.Release studies of Guest Encapsulated DVB Cross linked Polystyrene
  • 4.4.1.b.Swelling Studies of Guest Encapsulated DVB Cross linked Polystyrene
  • 4.4.1.c.Molecular Weight Between Cross links for Guest Encapsulated PS-DVB Cross linked Polymer
  • 4.4.2.Guest Encapsulated HDDMA Crosslinked Polystyrene
  • Fig.4.17 Scanning electron micrographs
  • 4.4.2.a.Release Studies of Guest Encapsulated PS-HDDMA Resin
  • 4.4.2.b. Swelling Behaviour of Guest Encapsulated PS-HDDMA Resin
  • 4.4.2.c.Quantitative Interpretation of the Results
  • 4.5. Thermal Analysis of Cross linked Copolymers and the Host-Guest System
  • 5. EXPERIMENTAL
  • 5.1 General
  • 5.2 Synthesis of Polyacrylamide- Divinyl Benzene Copolymers: General Procedure
  • 5.3 Swelling Studies of DVB Cross linked Polyacrylamide
  • 5.4 Determination of Solubility Parameter and Cohesive Energy Density of DVB Crosslinked PA
  • 5.5. Density Measurements: General Procedure
  • 5.6 Calculation of Molecular Weight Between Cross links
  • 5.7 Preparation and Swelling Studies of DVB Cross linked Polyacrylamide using Water- Methanol Mixture as the Solvent.
  • 5.8 Molecular Weight Between Cross links for PA-DVB Resin Prepared by using Water-Methanol Mixture as Diluent
  • 5.9 Preparation of Hexanedioldimethacrylate Cross linked Polyacrylamide
  • 5.10 Swelling Studies of HDDMA Cross linked PA
  • 5.11 Solubility Parameter of HDDMA Cross linked PA
  • 5.12 Molecular Weight Between Cross links for PA-HDDMA Resin
  • 5.13 Synthesis of Styrene-Divinylbenzene Copolymer: General Procedure
  • 5.14 Swelling Studies on DVB Cross linked PS
  • 5.15 Density Measurements: General Procedure
  • 5.16 Molecular Weight Between Cross links for PS-DVB Resin
  • 5.17 Synthesis of DVB Cross linked PS by Suspension Polymerisation: General Procedure
  • 5.18 Swelling Studies of DVB Cross linked PS. (prepared by suspension polymerisation)
  • 5.19 Molecular Weight Between Cross links for PS-DVB Resin (prepared by suspension polymerisation)
  • 5.20 Synthesis of Styrene-•Hexanedioldi methacrylate Copolymer: General Procedure
  • 5.21 Swelling Studies on PS-HDDMA Resin
  • 5.22 Molecular Weight Between Cross links for PS-HDDMA Resin
  • 5.23 Encapsulation of Benzoic Acid in DVB Cross linked Polyacrylamide
  • 5.24 Release of Benzoic Acid from Guest Encapsulated DVB Cross linked PA
  • 5.25 Swelling Studies on Guest Encapsulated DVB Cross linked PA
  • 5.26 Molecular weight Between Cross links for Guest Encapsulated DVB Cross linked PA
  • 5.27 Preparation of Benzoicacid Encapsulated Hexanedioldimetharcylate Cross linked Polyacrylamide: General Procedure
  • 5.28 Release of Benzoic Acid from Guest Encapsulated PA-HDDMA Resin
  • 5.29 Swelling Studies on Guest-Encapsulated PA-HDDMA Resin
  • 5.30 Molecular Weight Between Cross links for Guest Encapsulated PA-HDDMA Resin
  • 5.31 Encapsulation of Benzoic Acid in DVB Cross linked Polystyrene
  • 5.32 Controlled Release of Benzoic Acid from Guest-Encapsulated: PS-DVB Resin
  • 5.33 Swelling Studies on Guest-Encapsulated PS-DVB Resin
  • 5.34 Molecular Weight Between Cross links for Guest-encapsulated PS-DVB Resin
  • 5.35 Preparation of Benzoic Acid Encapsulated HDDMA Cross linked Polystyrene
  • 5.36 Controlled Release of Benzoic Acid from Guest Encapsulated PS-HDDMA Resin
  • 5.37 Swelling Studies on Guest-Encapsulated PS-HDDMA Resin
  • 5.38 Molecular Weight Between Cross links for Guest Encapsulated PS-HDDMA Resin
  • 5.39 Thermogravimetric Analysis of the Polymers
  • 6. CONCLUSION AND OUTLOOK
  • REFERENCES
  • LIST OF PUBLICATIONS