Synthesis of soluble oligsiloxane-end-capped hyperbranched polyazomethine and their application to CO2/N2 separation membranes

Liang Xu; Tianyang Lei; Boyu Jing; Yu Zang; Fengjuan Miao; Toshiki Aoki; Masahiro Teraguchi; Takashi Kaneko

doi:10.1080/15685551.2018.1472720

Synthesis of soluble oligsiloxane-end-capped hyperbranched polyazomethine and their application to CO₂/N₂ separation membranes

Des Monomers Polym. 2018 May 23;21(1):99-104. doi: 10.1080/15685551.2018.1472720. eCollection 2018.

Authors

Liang Xu¹, Tianyang Lei², Boyu Jing², Yu Zang², Fengjuan Miao³, Toshiki Aoki⁴, Masahiro Teraguchi⁴, Takashi Kaneko⁴

Affiliations

¹ College of Chemistry and Chemical engineering, Qiqihar University, Qiqihar, China.
² College of Materials Science and Engineering, Qiqihar University, Qiqihar, China.
³ College of Communications and Electronics Engineering, Qiqihar University, Qiqihar, China.
⁴ Faculty of Engineering, Niigata University, Nishi-ku, Japan.

Abstract

Three soluble hyperbranched polyazomethines containing oligosiloxane end group HBP-PAZ-SiO_n were successfully synthesized. HBP-PAZ-SiO_ns were used as modifiers of ethyl cellulose (EC) and polysulfone (PS) membranes. Blend membranes, HBP-PAZ-SiO_n /EC and HBP-PAZ-SiO_n /PS were prepared by blending the THF solution of HBP-PAZ-SiO_n with ethanol solution of EC and dichloromethane solution of PS, respectively. Surprisingly, the permeabilities for CO₂ of the blend membranes were more than 15-16 times higher than those of pure EC and PS membranes without any drop of pemselectivity to N₂. This unusual improvement has been achieved by both enhancement of diffusivity for carbon dioxide and nitrogen by the oligosiloxane groups and enhancement of affinity of the amino groups with carbon dioxide at the end groups of HBP-PAZ-SiO_n .

Keywords: CO2/N2 separation; Polyazomethine; blend membrane; hyperbranched; oligosiloxane.

Grants and funding

This work was supported by the National Natural Science Foundation of China [21404064]; the Natural Science Foundation of Heilongjiang Province of China [LC2016022]; the University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2016089]; Human Resources and Social Security Department of Heilongjiang province of China [[2017] No.490]; the Overseas Scholars Foundation of the Education Department of Heilongjiang province of China [1254HQ008]; and the Program of Young Teachers Scientific Research in Qiqihar University [2014k-Z04].