The Effect of Molecular Orientation on the Mechanical Properties of Polystyrene - 1st Edition - ISBN: 9780080210186, 9781483139296

The Effect of Molecular Orientation on the Mechanical Properties of Polystyrene

1st Edition

Macromolecular Division

Authors: T. T. Jones
eBook ISBN: 9781483139296
Imprint: Pergamon
Published Date: 1st January 1976
Page Count: 20
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The Effect of Molecular Orientation on the Mechanical Properties of Polystyrene presents the results of a study that investigated the effect of molecular orientation on the mechanical properties of polystyrene. Oriented sheets of two commercial homopolystyrenes (PSA and PSB) differing in molecular weight, rheological and glass transition temperature properties were prepared by sheet extrusion and drawing. The properties of the resulting sheets were examined at seven different laboratories in Europe. The study focused on length reversion ratio, birefringence, orientation stress, shrinkage stress, and various mechanical properties such as rupture stress and strain, the specific energy of rupture, and sonic modulus and relaxation modulus. Impact behavior and environmental stress cracking behavior were also evaluated. One of the findings was that oriented polymers subjected to lateral strains can develop catastrophic crack growth when immersed in an active liquid. The onset of the cracks depends on the lateral strain imposed as well as the degree of orientation. PSB was more resistant than PSA.
This monograph should be a useful resource for chemists.

Table of Contents

1. Introduction

2. Section (a) Characterization of the Raw Materials

2.1 Molecular Weight Characterization

2.2 Glass Transition Temperature, Tg

2.3 Melt Rheology

2.4 Conclusions

3. Section (b) Preparation of Oriented Sheet Materials

4. Section (c) The Degree of Orientation

4.1 The Length Reversion Ratio

4.2 Birefringence

4.2.1 Birefringence and Nominal Draw Ratio

4.2.2 Variation of Birefringence with Depth within Sheet

4.2.3 Birefringence and Length Reversion Ratio

4.3 The Orientation Parameter

4.3.1 Birefringence and Orientation Stress

4.3.2 Birefringence, Orientation Stress, Shrinkage Stress and Stress Relaxation

4.3.3 Birefringence and Sonic Modulus

4.4 Conclusions

5. Section (d) Some Properties of the Oriented Sheets

5.1 Tensile Properties

5.1.1 The Estimation of Strain Rate, ϵ

5.1.2 The Estimation of Specific Rupture Energy, Wr

5.1.3 The Variation of Rupture Stress with Strain Rate and Orientation

5.1.4 The Variation of Rupture Strain with Strain Rate and Orientation

5.1.5 The Variation of Specific Rupture Energy, Wr, with Strain Rate and Orientation

5.1.6 Variation of Rupture Strain with Time to Rupture

5.1.7 The Time Dependent Young's Modulus of Elasticity, E(t), and the Relaxation Spectrum H (In τ)

5.1.8 The Effect of Temperature on Tensile Properties

5.2 Impact Strength

5.3 Environmental Stress Cracking

6. Summary and Conclusions




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© Pergamon 1976
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About the Author

T. T. Jones

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