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Study of Gases Permeation in Necklace-Shaped Dimethylsiloxane Polymers Bearing POSS Cages

1
WPI International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
2
NanoMembrane Technologies Inc., 4-1, Kyudai-Shimachi, Nishi-ku, Fukuoka 819-0388, Japan
3
Center for Molecular Systems (CMS), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
4
Laboratory for Chemistry and Life Science, Tokyo Institute of Technology, 4259 Nagatsutacho, Midori-ku, Yokohama 226-8503, Japan
5
Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
6
JNC Petrochemical Corporation, Ichihara Research Center; 5-1 Goikagan, Ichihara, Chiba 290-8551, Japan
*
Authors to whom correspondence should be addressed.
Membranes 2019, 9(4), 54; https://doi.org/10.3390/membranes9040054
Received: 26 February 2019 / Revised: 5 April 2019 / Accepted: 11 April 2019 / Published: 16 April 2019
(This article belongs to the Special Issue State-of-the-Art of Membrane Technology in the Asia-Pacific Region)
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Abstract

The transport of small gases (H2, CO2, N2, O2) through a series of novel membranes based on necklace-shaped inorganic polymers ([email protected]), in which a polyhedral oligomeric silsesquioxane (POSS) cage unit and soft chains of oligo-dimethyl siloxane (DMS) were alternately connected, was investigated. The influence of the DMS chain length and crosslinking density of the [email protected] on membrane properties were studied. The membranes revealed characteristic structure-property relation towards both glass transition and gases transport. Specifically, clear dependence of properties from the length of DMS units (or overall siloxane content) was revealed. Gas transport properties, when compared to state-of-art polydimethylsiloxane and commercial silicone rubber, demonstrated significantly higher selectivity of [email protected] for carbon dioxide (in CO2/N2), hydrogen (in H2/N2) and oxygen (in O2/N2) but lowered permeability, proportional to the amount of POSS in the material. With a precise control over mechanical and thermal properties compared to conventional silicone rubbers, described materials could be considered as materials of choice in niche gas separation or other applications. View Full-Text
Keywords: POSS; organic–inorganic hybrid; necklace shaped polymer; gas separation membrane POSS; organic–inorganic hybrid; necklace shaped polymer; gas separation membrane
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Selyanchyn, R.; Fujikawa, S.; Katsuta, N.; Suwa, K.; Kunitake, M. Study of Gases Permeation in Necklace-Shaped Dimethylsiloxane Polymers Bearing POSS Cages. Membranes 2019, 9, 54.

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