High pressure dilatometry on polybutene-1.

Autor: Leute, U., Dollhopf, W.
Zdroj: Colloid & Polymer Science; Apr1983, Vol. 261 Issue 4, p299-305, 7p
Abstrakt: High pressure dilatometry is used to study the melting processes and the melt of isotactic polybutene-1. Evaluating a great number of isobaric V(T)-curves determined in the range of a few hundred bar the pressure dependence of the melting temperature is accurately determined for modifications I and II. Extrapolation to 1 bar yields dT/ dp=43.6 K/kbar and a heat of fusion ΔH=8.0 kJ/ mol for modification I. The values for modification II are 21.4 and 6.9 resp. Up to 4.25 kbar data of melting temperature, volume, entropy and enthalpy as a function of pressure are reported and also the compressibility of the melt. Finally the relative thermodynamic stability of the different modifications is discussed. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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