ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
The solubility of gases and volatile liquids in low-density polyethylene (LDPE) and polyisobutylene (PIB) at elevated temperatures has been correlated, using the experimental data available in the literature. In the present study, a Henry's constant Kp at a total pressure of approximately 1 atm defined as P1 = KPV10, where P1 is the partial pressure of the solute in the vapor phase and V10 is the solubility (cm3 solute/g polymer at 273.2 K and 1 atm), is correlated for nonpolar solutes with the following expressions: (1) For LDPE, ln(1/KP) = -1.561 + (2.057 + 1.438ω) (Tc/T)2; (2) For PIB, ln(1/Kp) = -1.347 + (1.790 + 1.568ω) (Tc/T)2, in which ω is the acentric factor and Tc the critical temperature of the solute. In obtaining the above correlations we have used 27 solutes covering 115 data points for LDPE, and 18 solutes covering 148 data points for PIB. We have calculated values of 1/Kp from the literature data reported in terms of the retention volume (Vg0), weight-fraction Henry's constant (H1), activity coefficient at infinite dilution (Ω1∞), Flory-Huggins interaction parameter (χ), or V10/P obtained from high pressure sorption experiments. The correlations obtained in this study permit one to estimate with reasonable accuracy the solubility of gases and volatile liquids in either LDPE or PIB, with information on the acentric factor (ω) and critical temperature (Tc) only. The relationship for LDPE is also applicable for solubilities in high-density polyethylene. Relationships for the heat of vaporization of solutes from infinitely dilute LDPE or PIB solutions are also derived from the temperature variation of 1/Kp.
Additional Material:
14 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1985.070300320
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