New Synthetic Methods of Novel Nanoporous Polycondensates and Excellent Oxygen Permselectivity of Their Composite Membranes

Yu Zang; Toshiki Aoki; Masahiro Teraguchi; Takashi Kaneko; Hongge Jia; Liqun Ma; Fengjuan Miao

doi:10.3390/nano9060859

New Synthetic Methods of Novel Nanoporous Polycondensates and Excellent Oxygen Permselectivity of Their Composite Membranes

Nanomaterials (Basel). 2019 Jun 5;9(6):859. doi: 10.3390/nano9060859.

Authors

Yu Zang¹, Toshiki Aoki², Masahiro Teraguchi³, Takashi Kaneko⁴, Hongge Jia⁵, Liqun Ma⁶, Fengjuan Miao⁷

Affiliations

¹ Heilongjiang Province Key Laboratory of Polymeric Composition Material, College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar 161006, China. zangyu@qqhru.edu.cn.
² Faculty of Engineering, Niigata University, Ikarashi 2-8050, Nishi-ku, Niigata 950-2181, Japan. toshaoki@eng.niigata-u.ac.jp.
³ Faculty of Engineering, Niigata University, Ikarashi 2-8050, Nishi-ku, Niigata 950-2181, Japan. teraguti@eng.niigata-u.ac.jp.
⁴ Faculty of Engineering, Niigata University, Ikarashi 2-8050, Nishi-ku, Niigata 950-2181, Japan. kanetaka@gs.niigata-u.ac.jp.
⁵ Heilongjiang Province Key Laboratory of Polymeric Composition Material, College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar 161006, China. jiahongge11@hotmail.com.
⁶ Heilongjiang Province Key Laboratory of Polymeric Composition Material, College of Materials Science and Engineering, Qiqihar University, Wenhua Street 42, Qiqihar 161006, China. maliqun6166@163.com.
⁷ College of Communications and Electronics Engineering, Qiqihar University, Wenhua Street 42, Qiqihar 161006, China. miaofengjuan@163.com.

Abstract

Two kinds of novel nanoporous polycondensates (sc(Rf)) have been synthesized by two new preparation methods consisting of polycondensation and highly selective photocyclicaromataization of 1/3 helical cis-cis polyphenylacetylenes with polymerizable groups. By the original methods, new well-defined sheet polymers having nanopores or nanospaces have been synthesized for the first time. Their composite membranes, containing small amounts (1.0 wt%) of sc(Rf), had ultrahigh oxygen permeability (Po₂ > 1000 barrer), and their plots were beyond the Robeson's upper bound line in the graph of oxygen permselectivity (α = Po₂/P_N2) versus Po₂. Both α and Po₂ values were enhanced by adding only small amounts (1.0 wt%) of sc(Rf). One of the sc(Rf)s synthesized on the base membrane surface showed the best performance, i.e., Po₂ = 5300 barrer and α = 2.5. The membrane surface was effectively covered by sc(Rf), judging from the contact angle values. It is thought that nanopores and nanospaces created in and between sc(Rf) molecules played an important role for the enhancement of both α and Po₂/P_N2.

Keywords: high oxygen permselectivity; highly selective photocyclicaromataization (SCAT); nanopore; nanospace; polycondensates; polyphenylacetylene; synthesis.