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Solubility and diffusivity of cyclohexane in two different polyethylenes
Author(s) -
Schulz Taylor C.,
Danner Ronald P.
Publication year - 2015
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.23943
Subject(s) - cyclohexane , solubility , thermal diffusivity , materials science , thermodynamics , polyethylene , high density polyethylene , polymer , hildebrand solubility parameter , atmospheric temperature range , polymer chemistry , composite material , organic chemistry , chemistry , physics
The solubility and diffusivity of cyclohexane in a very low density polyethylene (VLDPE) have been measured over a range of temperatures and concentrations. These data provide an interesting contrast to similar data for high density polyethylene. Above the melt temperatures, the solubilities for both polyethylenes follow the same correlation as a function of the activity. Below the melt temperature, however, a correction is needed to correlate the solubility that accounts for the elasticity effects caused by the polymer chains between the crystals. The capabilities of two models that can predict the solubility and the free‐volume model for the correlation of the diffusivity have been analyzed. Unlike in previous studies, the diffusivity in the VLDPE does not appear to be influenced significantly by the presence of crystals. POLYM. ENG. SCI., 55:688–692, 2015. © 2014 Society of Plastics Engineers