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Thermodynamics of the dissolution temperatures of copolymer-systems

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  • Polymer Science
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Summary

The maximum melting temperatures of the last detectable extended-sequence-mixing crystals of copolymers of ethylene mixed with low molecular weighted solvents have been measured for various solvents covering the total concentration range. A quantitative thermodynamic description can be established whereby the first virial coefficient must be adjusted only.

It can be shown that for liquid-liquid phase-separation “macroscopic” unmixing of the total chains of the pseudo-eutectic copolymer, for crystallization micro-phase separation occur only.

Zusammenfassung

Die maximalen Schmelztemperaturen der letzten meßbaren „Sequenz-Ketten-Mischkristalle” in statistischen Copolymeren des Äthylens sind in Lösung für verschiedene Lösungsmittel über den gesamten Konzentrationsbereich gemessen worden. Die Ergebnisse können thermodynamisch quantitativ beschrieben werden, wobei ausgehend von den characterisierten reinen Copolymersystemen nur der erste Virialkoeffizient angepaßt werden muß.

Es kann verifiziert werden, daß bei Entmischung im flüssigen Zustand ganze Ketten sich trennen, während bei der Kristallisation nur kristallisierbare Sequenzen, also Teile von Ketten, sortiert werden.

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Authors and Affiliations

  1. Abteilung für Experimentelle Physik I, Universität Ulm, D-7900, Ulm

    H. G. Kilian & F. Stracke

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  1. H. G. Kilian
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  2. F. Stracke
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With 25 figures and 7 tables

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Kilian, H.G., Stracke, F. Thermodynamics of the dissolution temperatures of copolymer-systems. Colloid & Polymer Sci 255, 10–26 (1977). https://doi.org/10.1007/BF01449631

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  • DOI: https://doi.org/10.1007/BF01449631

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