Stereospecific Polymerization of Isoprene - 1st Edition - ISBN: 9780080299877, 9781483154749

Stereospecific Polymerization of Isoprene

1st Edition

Authors: Elena Ceausescu
eBook ISBN: 9781483154749
Imprint: Pergamon
Published Date: 1st January 1983
Page Count: 294
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Stereospecific Polymerization of Isoprene, a doctoral dissertation by Dr. Elena Ceausescu, is a study of the synthesis of cis-l, 4-polyisoprene rubber, an elastomer of synthetic rubber whose structure and properties are similar to that of natural rubber. This elastomer is primarily used in the manufacture of tires, belts, hoses, matting, flooring, dampeners, and other synthetic rubber goods. The book is organized into two parts. Part I, the Ph.D. thesis, focuses on the explanation and exposition of the polymerization reaction; properties of the polymer; and certain theoretical aspects related to the polymer’s reaction mechanism and kinetics. Part II presents data derived from an extensive variety of experiments and tests intended to serve as a basis for the industrial production of cis-l, 4-polyisoprene rubber. The text will be an interesting book for materials engineers, industrial engineers, chemists, and science students engaged in the study of polymers.

Table of Contents

Part I Literature Data


Chapter I. General Comments on Stereospecific Polymerization

1. Research Prior to the Discovery of Stereospecific Polymerization

2. Structural Characteristics

3. The Main Types of Atereoregular Polymers

4. General Methods for the Synthesis of Stereoregular Polymers

Chapter II. Stereospecific Catalysts

A. Heterogeneous Catalyst Systems

A1. Ziegler-Natta-Type Catalysts

A2. Oxide-Type Catalysts

A3. Alfin Catalysts

A4. Alkali Metal, Alkyl or Aryl Catalysts

B. Homogeneous Catalyst Systems

B1. Organic Compounds of Group I—III Metals

B2. Soluble Ziegler-Type Catalysts

C. Catalysts Effective in Polar Media

Chapter III. Mechanisms of Stereospecific Polymerization

A. Free Radical Mechanisms

B. Ionic Mechanisms

B1. Cationic Mechanisms

B2. Anionic Mechanisms

C. Mechanisms of Polymerization Using Ziegler-Natta Catalyst Systems

C1. Free Radical Coordination Mechanisms

C2. Cationic Coordination Mechanisms

C3. Anionic Coordination Mechanisms

Chapter IV. Kinetics of Stereospecific Polymerization

1. The Activity of the Catalytic Sites

2. The Ionic Nature of the Catalyst System

3. The Influence of the Al/Ti Ratio and of the Concentration of the Catalyst

4. The Influence of the Solvent

5. Diffusion Phenomena

Experimental Part

Chapter I. Purification of the Reagents Used in the Stereospecific Polymerization of Isoprene

A. Purification of Isoprene

B. Solvent Purification

C. Purification of Catalyst Components

D. Purification of Nitrogen

Chapter II. Research on the Stereospecific Polymerization of Isoprene with Heterogeneous Catalyst Systems of the AlR3 + TiCl4 Type

A. Polymerization of Isoprene of over 99% Purity

B. Polymerization of the ca. 25% Isoprene Fraction

C. Some Aspects of the Kinetics of the Stereospecific Polymerization of Isoprene

Chapter III. Characterization of cis-l,4-Polyisoprene

A. Physico-Chemical Characterization

B. Physico-Mechanical Characterization

Part II Introduction

Chapter I. Pre-Formed Ziegler-Natta-Type Catalyst Systems

1. Two-Component AlR3 + TiCl4 Catalyst Systems

2. Modified AlR3 + TiCl4 Catalyst Systems

Chapter II. Stereospecific Polymerization of Isoprene with Pre-Formed Catalyst Complexes

1. Purity of Polymerization Systems

2. Some Aspects of Isoprene Polymerizationrene

3. Correlation between the Structure and the Technological Behavior of Polyisoprene

Chapter III. Deactivation of the Catalyst Complex

1. Deactivation of the Catalyst Complex without Inactivation of the Transition Metal

2. Deactivation of the Catalyst Complex with Inactivation of the Transition Metal

3. Deactivation of the Catalyst Complex in the Absence of Polyisoprene

4. Deactivation of the Catalyst Complex in the Presence of Polyisoprene

Chapter IV. The Stabilization of Polyisoprene

1. Autoxidation Mechanisms

2. Relationships between Structure and Reactivity

3. Selection Criteria for Stabilizers

4. Mixtures of Stabilizers

5. Estimation of the Effectiveness of Stabilizers

6. Macromolecular Antioxidants

Chapter V. Recovery of Polyisoprene from Solution

Chapter VI. Characterization of cis,4-Polyisoprene Rubber by Nuclear Magnetic Resonance, Electron Microscopy and Electron Diffraction

1. Determination of the Microstructure of cis-1,4-Polyisoprene by High-Resolution Nuclear Magnetic Resonance

2. Determination of Glass-Transition Temperatures by Electron Spin Resonance

3. Electron Microscopy Studies of Natural Rubber and Synthetic cis-1,4-Polyisoprene


Part I

Part II



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About the Author

Elena Ceausescu

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