Abstract: A way of preparing separation layers by the pyrolysis of fluorinated polyimide obtained from 2,4,6-trimethyl-m-phenylenediamine (2,4,6-TMmPDA) and 2,2-bis(3',4'-dicarboxyphenyl)hexafluoropropane (6FDA) applied onto a diatomite carrier is described. Thermogravimetry, elemental analysis, low-temperature nitrogen adsorption, high-resolution electron microscopy, and gas chromatography are used to study changes in the texture and chromatographic characteristics of these layers. It is found that changes in the structure and the effectivity of separation characteristic of the layers depend on the temperature of pyrolysis, which ranges from 250 to 1100A degrees C. It is established that a layer of separation is formed at 250-350A degrees C, and the order of elution of hydrocarbons is similar to their chromatographic behavior on such stationary phases as OV-101. Layers of amorphous carbon formed on the surfaces of individual particles on a diatomite surface at 500-700A degrees C. These layers ensure highly stable and selective separation of permanent gases and hydrocarbons when they are present together.

Cite: Yakovleva E.Y. , Shundrina I.K. , Gerasimov E.Y.
High-temperature adsorption layers based on fluoridated polyimide and diatomite carrier
Russian Journal of Physical Chemistry A. 2017. V.91. N9. P.1797-1804. DOI: 10.1134/S0036024417090321 WOS Scopus РИНЦ

Dates:

Published online:	Aug 24, 2017
Published print:	Sep 1, 2017

Identifiers:

Web of science	WOS:000408432000026
Scopus	2-s2.0-85028352862
Elibrary	31061176
OpenAlex	W2749161266

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