## Abstract A reduction formula for the calculation of the specific volume __v__ at any temperature __T__ and any pressure __P__ is derived; it consists of the two equations: The parameters ξ, ζ and ψ can be easily calculated from values in the literature, and therefore only a volume‐temperature c
Über die druckabhängigkeit der viskoelastischen und physikalisch-chemischen eigenschaften von polymeren, 2. Spezifisches volumen und thermische ausdehnung einiger polymeren beim schmelzen und kristallisieren
✍ Scribed by Karl, Veit-Holger ;Asmussen, Frithjof ;Ueberreiter, Kurt
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1977
- Weight
- 457 KB
- Volume
- 178
- Category
- Article
- ISSN
- 0025-116X
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✦ Synopsis
Abstract
Measurements of specific volumes are described as function of temperature and pressure of melting or crystallizing linear polyethylene, isotactic polypropylene, and polyoxymethylene. A pressure range of 50 to 1600 bar permits determination of relative volume changes as function of temperature and pressure. Pressure influence on melting points, temperature hysteresis between melting and crystallization and their volume changes as well as the thermodynamic driving force of phase change have been investigated. Clausius‐Clapeyron's equation permits calculation of heats of crystallization.
📜 SIMILAR VOLUMES
## Abstract Melting and crystallization of polyethylene (PE) with various amounts of xylene is investigated by pressure dependent volume‐temperature curves. These can be calculated by a reduction formula described earlier. Flory's formula for lowering of the melting point of polymers by solvents pr
## Abstract Ein neues Hochdruckkapillarviskosimeter wird beschrieben, mit dem rheologische Eigenschaften von Polymeren bis zu einem Druck von 5000 bar und einer Temperatur von 200°C untersucht werden können. Die scheinbare Viskosität von Hochdruck‐Polyethylen wird in Abhängigkeit von Druck und Sche