- PII
- S22181180S2218117225030015-1
- DOI
- 10.7868/S2218118025030015
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume 15 / Issue number 3
- Pages
- 151-161
- Abstract
- In this work, the membranes based on crystallizable poly(hexadecyl-methyl-siloxane) (PHDMS) were obtained and their gas transport properties in relation to a number of light hydrocarbons were investigated with a focus on n-butane and methane permeability and selectivity. A first-order phase transition (crystallization of side alkyl chains) with a melting temperature (T) of 26°C was detected for the PHDMS-membranes. It was shown that the membrane transport properties were significantly influenced by their phase state. The gas permeability, diffusivity and solubility undergone a sudden change in the vicinity of T. Thus, a decrease in temperature from 30° to 20°C leads to a decrease in the hydrocarbons permeability coefficients by an order of magnitude. On one hand, the membranes n-butane/methane selectivity at a temperature T > T did not exceed 25, which is comparable with the results for previously studied polyalkylmethylsiloxanes with shorter alkyl chains. On the other, the n-butane/methane selectivity of semicrystalline membranes (T < T), despite a noticeable reduction in gas permeability, can reach selectivity values of ~150.
- Keywords
- мембраны газопроницаемость селективность кристаллизация боковых цепей
- Date of publication
- 04.08.2025
- Year of publication
- 2025
- Number of purchasers
- 0
- Views
- 32
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