Phase diagrams of low-density polyethylene–alkylbenzene systems

Complete phase diagrams for mixtures of low-density polyethylene with p - and m -xylene are plotted by optical means in developing the concept of which partially crystalline polymers are microstructured liquids. It is shown that in contrast to the ones presented in the literature, both diagrams cont...

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Bibliographic Details
Published in:Russian Journal of Physical Chemistry A 2017-03, Vol.91 (3), p.425-429
Main Authors: Ilyasova, A. N., Kudryavtsev, Y. V., Lebedeva, T. N., Levashova, I. V., Flyagina, Yu. A., Pochivalov, K. V.
Format: Article
Language:English
Subjects:
Alkylbenzenes
Amorphization
Binary systems
Chemical industry
Chemical Thermodynamics and Thermochemistry
Chemistry
Chemistry and Materials Science
Crosslinking
Crystallites
Low density polyethylenes
Molecular weight
Phase diagrams
Physical Chemistry
Polyethylene
Xylene
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Summary:Complete phase diagrams for mixtures of low-density polyethylene with p - and m -xylene are plotted by optical means in developing the concept of which partially crystalline polymers are microstructured liquids. It is shown that in contrast to the ones presented in the literature, both diagrams contain the solubility boundary curve of the low-molecular weight component in the polymer, above which the polyethylene has the structure of a single-phase gel (crosslinks formed by crystallites and amorphous regions saturated with xylene). At the figurative point on the diagrams, a situation is observed in which the dissolution of all the liquid contained in the initial two-phase system in the polymer is accompanied by its simultaneous complete amorphization. The parameters of the figurative point allow us to estimate the thermodynamic affinity of different alkylbenzenes toward polyethylene.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024417030098