I= EFFECTS OF ADDITION OF INORGANIC SALTS ON THE COPOL YMERIATION OF VINYL AND ALLYL MONOMERS
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Title of Thesis
EFFECTS OF ADDITION OF INORGANIC SALTS ON THE COPOL YMERIATION OF VINYL AND ALLYL MONOMERS

Author(s)
Abdul Rasheed Khan
Institute/University/Department Details
University of Karachi/ Department of Chemistry
Session
1980
Subject
Chemistry
Number of Pages
272
Keywords (Extracted from title, table of contents and abstract of thesis)
copol ymeriation, vinyl monomers, allyl monomers, copper chloride, cobalt chloride, cadmium chloride, mercury chloride, strontium chloride, manganese chloride, zinc chloride, nickel chloride, platonic chloride, chromium chloride, copolymerization

Abstract
Studies on the rate of thermal copolymerization of viny1 and ally1 monomers in the presence of inorganic salts like copper chloride, cobalt chloride, cadmium chloride, mercury chloride, strontium chloride, manganese chloride, zinc chloride, nickel chloride, platonic chloride and chromium chloride have been carried out. As a general behavior, those salts which are soluble in monomer pair increase the rte by forming complexes through active monomeric group provided sufficient quantity of monomer is left behind to serve as a solvent for the complex formed. This is the reason for the monomer reactivity ratio not being changed appreciably. Our findings show a marked decrease in the number average molecular weight Mn of copolymer prepared in the presence of salt suggesting that salt behave as a chain transfer agent. It was also observed that the binary mixture of the monomers when heated in the presence of such salts which are insoluble in both monomers, the initiation reaction takes place thermally by the adsorption of the reacting monomers on the solid surface of inorganic salts.

The overall mechanism may be that the initiation step of the radical copolymerization of viny1 and ally1 monomers in the absence of salt might be thermal initiation caused by the hydrogen transfer between the monomers. In the presence of salt monomers undergo complexation due to delocalization of II-electrons of the double bond of complexed monomer. The complexation of the monomers with salt probably increase the polarity of the monomers and stabilize the transition state of the reaction

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S. No. Chapter Title of the Chapters Page Size (KB)
1 0 Contents
83.46 KB
2 1 Introduction 1
498.35 KB
  1.1 Types Of Polymerization 1
  1.2 Factors Affecting The Polymerization 7
  1.3 Copolymerization 12
  1.4 Factors Affecting Copolymerization 18
  1.5 Effect Of Organic And Inorganic Salts And Their Complexes On Copolymerization Of Different Monomers. 23
  1.6 Use Of Organo -Inorganic Compounds As Catalysts In Polymerization Of Monomers 28
  1.7 Olefin Polymerization In Presence Of Inorganic Salts 34
  1.8 Ains And Objects. 36
3 2 Experimental And Results 39
816.61 KB
  2.1 Material 39
  2.2 Procedure Of Preparation Of Complexes 40
  2.3 Copolymerization Study Of Different Systems 45
  2.4 Copolymerization Procedure 48
  2.5 Analysis Of The Copolymer 48
  2.6 Determination Of Different Parameters 50
  2.7 Studies Of Different Systems 55
4 3 Discussion 127
876.74 KB
  3.1 Styrene – Acrylonitrile System 127
  3.2 Acrylonitrile – Allyl Alcohol System 143
  3.3 Styrene – Ally1 Alcohol System 158
  3.4 Styrene – Methylacrylate System 167
  3.5 Styrene – Methlmethacrylate System 179
  3.6 Acrylonitrile Vinylidene Chloride System 191
  3.7 Conclusion 202
5 4 Appendix 206
504.98 KB
  4.1 Monomer Reactivity Ratio Curves For Styrene – Acrylonitrile System 206
  4.2 Monomer Reactivity Ratio Curves For Acrylonitrile – Ally1 Alcohol System 212
  4.3 Monomer Reactivity Ratio Curves For Styrene – Ally1 Alcohol System 218
  4.4 Monomer Reactivity Ratio Curves For Styrene – Methyl Acrylate System 224
  4.5 Monomer Reactivity Ratio Curves For Styrene – Methyl Acrylate System 230
  4.6 Monomer Reactivity Ratio Curves For Acrylonitrile-Vinylidene Chloride System 236
  4.7 I.R. Spectra Of 242
  4.8 Curves For Intrinsic Viscosity Of 249
  4.9 Bibliography 256