najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2018-9-2-252-258najo-700Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХThe effect of geometric confinement on gas separation characteristics of additive poly[3-(trimethylsilyl)tricyclononene-7]ChernovaE. A.

Leninskiye Gory, Moscow, 119991

BermeshevM. A.

Leninsky prospect, 29, Moscow, 119991

PetukhovD. I.

Leninskiye Gory, Moscow, 119991

BoytsovaO. V.

Leninskiye Gory, Moscow, 119991

Leninsky prospect, 31, Moscow, 119991

LukashinA. V.

Leninskiye Gory, Moscow, 119991

alexey.lukashin@gmail.comEliseevА. A.

Leninskiye Gory, Moscow, 119991

eliseev@inorg.chem.msu.ruLomonosov Moscow State UniversityRussian FederationA.V. Topchiev Institute of Petrochemical Synthesis (TIPS) Russian Academy of SciencesRussian FederationLomonosov Moscow State University; Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of SciencesRussian Federation20181208202592252–258Copyright © Chernova E.A., Bermeshev M.A., Petukhov D.I., Boytsova O.V., Lukashin A.V., Eliseev А.A., 20252025Chernova E.A., Bermeshev M.A., Petukhov D.I., Boytsova O.V., Lukashin A.V., Eliseev А.A.Chernova E.A., Bermeshev M.A., Petukhov D.I., Boytsova O.V., Lukashin A.V., Eliseev А.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/700

Composite membranes based on a hydrophobic glassy poly[3-(trimethylsilyl)tricyclononene-7] (PTCNSi-1) confined in the channels of anodic alumina with different pore diameters are discussed. Formation of continuous polymer film with partial penetration of polymer into the rigid pores of anodic alumina was achieved by spin-coating technique under vacuum suction. Mass-transport characteristics of composite membranes reveal a slight reduction of composite membrane permeability for condensable gases, and many-fold permeability drop for permanent gases as compared to the bulk film. This results in an ideal selectivity rise over 35 for C4H10/CH4 pair compared to 12.6 for bulk PTCNSi-1. The effect is attributed to a solubility-controlled mobility of polymer segments confined in the AAO channels and formation of rigid shallow polymer layer at AAO/polymer interface, which suppress transport of gases. The correlation between intrinsic properties of the polymer (hydrophobicity, Kuhn segment) and its transport characteristics in the confined state is discussed. The evolution of the permeance and pure-gas selectivity of the composite membranes during ageing is also reported.

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The authors declare that there are no conflicts of interest present.