Evaluation of Two Methods for Measuring Vapor Sorption in Polymers

In this paper, two methods for measuring the equilibrium vapor sorption in polymers are critically compared and data on sorption of toluene, p-xylene, hexane, cyclohexane, and heptane in low density polyethylene are reported. The vapor phase calibration method (VPC) was used to measure vapor sorptio...

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Bibliographic Details
Published in:Separation science and technology 2010-01, Vol.45 (9), p.1260-1264
Main Authors: Vopička, O., Friess, K., Langenhove, H. Van, Dewulf, J., Dingemans, M., Hynek, V., Šípek, M.
Format: Article
Language:English
Subjects:
Calibration
Confidence intervals
Cyclohexane
Density
gravimetric method
Hexanes
Interaction parameters
low density polyethylene
Sorption
Toluene
volatile organic compounds
VPC method
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Summary:In this paper, two methods for measuring the equilibrium vapor sorption in polymers are critically compared and data on sorption of toluene, p-xylene, hexane, cyclohexane, and heptane in low density polyethylene are reported. The vapor phase calibration method (VPC) was used to measure vapor sorption at low vapor activities in air (below 0.01), and the gravimetric method was used to measure sorption over wide range of activities of pure vapors (0.1-0.9). The Flory-Huggins interaction parameter (in amorphous phase) varied between 1.00 for cyclohexane and 1.19 for toluene. The resulting confidence intervals are conjunctive, indicating that both methods provide consistent results.
ISSN:0149-6395
1520-5754
DOI:10.1080/01496391003775899