Skip to main content Accessibility help

We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.

Close cookie message
×
Hostname: page-component-7bb8b95d7b-pwrkn Total loading time: 0 Render date: 2024-09-18T19:06:03.455Z Has data issue: false hasContentIssue false

12 - Polymers and Ceramics

Published online by Cambridge University Press:  05 June 2012

William F. Hosford
William F. Hosford
Affiliation:
University of Michigan, Ann Arbor
Get access

Summary

Introduction

Up to this point, the treatment has emphasized metallic materials because metals are most widely used for their mechanical properties. This chapter covers the differences between the properties of polymers and ceramics on the one hand and metals on the other.

Elasticity of Polymers

Elastic moduli of thermoplastic polymers are much lower and much more temperature sensitive than those of metals. Figure 12.1 illustrates schematically the temperature dependence of the elastic moduli of several types of polymers. The temperature dependence is greatest near the glass-transition temperature and near the melting point. The crosslinked polymer cannot melt without breaking the covalent bonds in the crosslinks. The stiffness of a polymer at room temperature depends on whether its glass-transition temperature is above or below the room temperature. Below the glass-transition temperature, the elastic moduli are much higher than above it. Figure 12.2 indicates that the modulus of polystyrene changes by a factor of more than 103 between 85°C and 115°C.

Glass Transition

If a random linear polymer is cooled very slowly, it may crystallize. Otherwise, it will transform to a rigid glass at its glass-transition temperature, Tg. Figure 12.3 is a plot of how the volume may change. If it crystallizes, there is an abrupt volume change. If it does not crystallize, there is a change of slope at Tg. Other properties change as the polymer is cooled below Tg. It toughness and ductility sharply decrease and its Young's modulus greatly increases.

Type
Chapter
Information
Solid Mechanics , pp. 187 - 202
Publisher: Cambridge University Press
Print publication year: 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

McCrum, N. G., Buckley, C. P., and Bucknall, C. B., Principles of Polymer Engineering, Oxford (1988).Google Scholar
Young, R. J. and Lovell, P. A., Introduction to Polymers, 2nd Ed., Chapman and Hall (1991).CrossRefGoogle Scholar
Ward, I. M. and Hadley, D. W., Mechanical Properties of Solid Polymers, Wiley (1993).Google Scholar
Engineered Materials Handbook, Vol. 2, Engineering Plastics, ASM International (1988).
Warner, S. B., Fiber Science, Prentice Hall (1995).Google Scholar
Barsoum, M. W., Fundamentals of Ceramics, McGraw-Hill (1997).Google Scholar
Kingery, W. D., Bowen, K. and Uhlman, , Introduction to Ceramics, 2nd ed. Wiley (1960).Google Scholar
Chiang, Y.-M., Birney, D. and Kingery, W. D.. Physical Ceramics, 2nd ed. Wiley (1997).Google Scholar
Engineered Materials Handbook, vol 4, Ceramics and Glasses, ASM International (1991).
McCrum, N. G., Buckley, C. P., and Bucknall, C. B., Principles of Polymer Engineering, Oxford (1988).Google Scholar
Young, R. J. and Lovell, P. A., Introduction to Polymers, 2nd Ed., Chapman and Hall (1991).CrossRefGoogle Scholar
Ward, I. M. and Hadley, D. W., Mechanical Properties of Solid Polymers, Wiley (1993).Google Scholar
Engineered Materials Handbook, Vol. 2, Engineering Plastics, ASM International (1988).
Warner, S. B., Fiber Science, Prentice Hall (1995).Google Scholar
Barsoum, M. W., Fundamentals of Ceramics, McGraw-Hill (1997).Google Scholar
Kingery, W. D., Bowen, K. and Uhlman, , Introduction to Ceramics, 2nd ed. Wiley (1960).Google Scholar
Chiang, Y.-M., Birney, D. and Kingery, W. D.. Physical Ceramics, 2nd ed. Wiley (1997).Google Scholar
Engineered Materials Handbook, vol 4, Ceramics and Glasses, ASM International (1991).

Save book to Kindle

To save this book to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Available formats
×

Save book to Dropbox

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.

Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

Available formats
×