Gas-separation and physical properties of ABA triblock copolymers synthesized from polyimide and hydrophilic adamantane derivatives

POLYMER

卷:202

Article

Ito, Tsubasa¹  Shiota, Ryunosuke¹  Taniguchi, Naomi¹  Spontak, Richard J.^2,3  Nagai, Kazukiyo¹ 

[1] Meiji Univ, Dept Appl Chem, Tama Ku, 1-1-1 Higashi Mita, Kawasaki, Kanagawa 2148571, Japan

[2] North Carolina State Univ, Dept Chem & Biomol Engn, Raleigh, NC 27695 USA

[3] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA

关键词: Polyimide;    Adamantane;    Gas separation;    Block copolymer;    Membrane;   

DOI  :  10.1016/j.polymer.2020.122642

来源: Elsevier

【 摘 要 】

In this study, ABA triblock copolymers derived from 4,4'-(hexafluoroisopropylidene)-diphthalic anhydride-2,3,5,6-tetramethyl-1,4-phenylenediamine (6FDA-TeMPD; PI) and 3-hydroxy-1-adamantyl methacrylate (HAdMA) or 3,5-dihydroxy-1-adamantyl methacrylate (DHAdMA) have been synthesized via atom transfer radical polymerization to generate mechanically tough and thermally stable gas-separation membranes with composition-tunable transport properties. Due to the inherent thermodynamic incompatibility between the chemically dissimilar blocks, these two series of triblock copolymers appear microphase-separated. While the gas permeability coefficients of these triblock copolymer membranes are consistently lower than that of PI due to the reduced fractional free volume of HAdMA and DHAdMA, the solubility coefficients of the copolymers are higher than that of PI due presumably to specific interactions between the polar hydroxyl group(s) and penetrant gas molecules. These triblock copolymers synthesized from PI and hydrophilic adamantane derivatives constitute a new class of nanostructured polymeric materials possessing excellent thermomechanical properties in conjunction with designer gas-separation properties.

【 授权许可】

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