ISSN:
1612-1112
Keywords:
Gas chromatography
;
Partition coefficients
;
Henry's constants
;
High density polyethylene
;
Polymer drying
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary Gas-solid partition coefficients (K) for n-hexane in high density polyethylene (HDPE) have been measured at conditions applicable to large-scale drying utilizing a novel headspace method. The method features considerable versability and simplicity due to the control of experimental conditions designed to favor full extraction of the analyte into the headspace. By combining this full extraction technique with a traditional static headspace experimental scheme, a method which measuresK and residual concentration is achieved. The results show that partition coefficients differ significantly between HDPE in its virgin powder and pellet forms, as well as among various HDPE grades. The differences are shown to be attributable to differences in % crystallinity of the specific polymer. Data collected over a wide range of hexane concentrations reveals saturation levels (solubilities) which correspond to crossover from evaporative to diffusion-controlled drying.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02272818
