Gas-separation and physical properties of ABA triblock copolymers synthesized from polyimide and hydrophilic adamantane derivatives
Gas-separation and physical properties of ABA triblock copolymers synthesized from polyimide and hydrophilic adamantane derivatives
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DOI：
10.1016/j.polymer.2020.122642
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发表时间：
2020-08
期刊：
影响因子：
4.6
通讯作者：
Tsubasa Ito;Ryunosuke Shiota;N. Taniguchi;R. Spontak;K. Nagai
中科院分区：
文献类型：
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作者：
Tsubasa Ito;Ryunosuke Shiota;N. Taniguchi;R. Spontak;K. Nagai
在这项研究中，阿坝三嵌段共聚物衍生自4，4 '-（六氟异丙叉）-二邻苯二甲酸酐-2，3，5，6-四甲基-1，4-苯二胺（6FDA-TeMPD; PI）和甲基丙烯酸3-羟基-1-金刚烷酯（HAdMA）或3，通过原子转移自由基聚合合成了5-二羟基-1-金刚烷基甲基丙烯酸酯（DHAdMA），以制备具有机械坚韧和热稳定性的气体分离膜，其组成为可调的传输特性。由于化学上不同的嵌段之间固有的热力学不相容性，这两个系列的三嵌段共聚物出现微相分离。虽然由于HAdMA和DHAdMA的自由体积分数降低，这些三嵌段共聚物膜的气体渗透系数始终低于PI的气体渗透系数，但共聚物的溶解度系数高于PI的溶解度系数，这可能是由于极性羟基与渗透剂气体分子之间的特定相互作用。这些由PI和亲水性金刚烷衍生物合成的三嵌段共聚物构成了一类新型纳米结构聚合物材料，具有优异的热机械性能以及设计师的气体分离性能。
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.