Anomalous viscosity behaviour of block copolymers as a function of the temperature for two sequence or ab type poly(isoprene: styrene)
✍ Scribed by M. Girolamo; J.R. Urwin
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- English
- Weight
- 296 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
The intrinsic viscosities of two sequence block copolymers of poly(isoprene:styrene), plotted as a function of the temperature in the solvent cyclohexane, have been found to exhibit anomalous behaviour. However, this type of behaviour is not confined to this particular solvent. A transition temperature, which is represented by a peak in the [,/] vs. Tcurve and which is well defined and reproducible, has been shown to vary with both the composition and the molecular weight. The general shape of the ['/l vs. T plot, which is common to these polymers, is discussed, a qualitative explanation of the curve and the transition point has been proposed.