Characterization of network segment density from compression modulus measurements on swollen elastomers
✍ Scribed by Anthony R. Cooper
- Book ID
- 104522825
- Publisher
- Society for Plastic Engineers
- Year
- 1990
- Tongue
- English
- Weight
- 325 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0032-3888
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✦ Synopsis
Abstract
The characterization of network segment density of elastomers is discussed. Normally equilibrium solvent swelling is used as long as the polymer‐solvent interaction parameter χ is available. However, χ is often not known or may be a function of the network segment density, or composition for a polymer whose structure is changed upon aging. The technique of measuring the modulus in tension or compression on solvent‐swollen samples allows the network segment density to be calculated from the theory of rubber elasticity. This circumvents the problems associated with the solvent swelling technique. The modification of a commercially available thermomechanical analyzer is described, to enable compression modulus measurements on solvent swollen elastomers to be performed.