ISSN:
0098-1273
Keywords:
Physics
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
A simple method of measuring the solubility of gases in polymers at elevated temperatures and high gas pressures is described by direct weighing of the sample after cooling to ambient temperatures. Changes in gas content during cooling which would cause errors are largely prevented by nucleating bubbles throughout the samples immediately prior to cooling, with the effect of making the internal partial pressure of gas equal to the external pressure while the polymer is soft and thus preventing gas flux to or from the sample. Results are given for the solubility of nitrogen in branched polyethylene in the temperature range 130-190°C at gas pressures up to 1,030 bar. A kink in the solubility isotherm at temperatures just above the normal crystalline melting point is believed to be caused by a pressure shift of the melting point. Comparison of the results with previous work by Lundberg et al. suggests a systematic error in the latter which reduced the apparent solubility at higher pressures.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1977.180150504
