A Thermally Rearranged Poly(benzoxazole) Composite Membrane for Gas Separation Prepared by Vapor Phase Growth

IF 4.4 2区 化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Applied Polymer Materials Pub Date : 2024-10-16 DOI:10.1021/acsapm.4c0221010.1021/acsapm.4c02210
Tian Yu, Qian Liu, Enkai Guo, Ning Qi*, Feng Ren and Zhiquan Chen*, 
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Abstract

Compositing metal organic framework (MOF) powder with a polymer substrate is an effective way to obtain an efficient gas separation membrane. However, the weak polymer–filler interaction usually leads to the formation of nonselective cracks in the composite material. Here, we report a MOF–polymer composite membrane with a continuous and dense MOF layer, which was synthesized by magnetron sputtering and vapor phase growth. A thermally rearranged poly(benzoxazole) (TR-PBO) membrane was converted from a hydroxy-polyimide precursor by a thermal rearrangement reaction, which was used as the polymer support of the composite membrane. An ultrathin ZnO seed layer was deposited on the TR-PBO support by magnetron sputtering technology, and then it was converted to a ZIF-8 layer by vapor phase growth. Scanning electron microscopy results confirm the formation of a dense, flat, and continuous ZIF layer with a thickness of about 450–600 nm. The ZIF-8 nanoparticles are uniform in size and evenly distributed. Furthermore, the attached ZIF layer significantly improves the gas selectivity of the composite membrane, which should be attributed to the sieving effect of the unique pore structure of ZIF-8. The method of magnetron sputtering combined with vapor phase growth is effective for improving the selectivity of the gas separation membrane and reducing the aggregation of MOF particles, which opens up a way for the design of flat and ultrathin gas separation composite membranes.

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一种通过气相生长制备的用于气体分离的热重排聚(苯并恶唑)复合膜
将金属有机框架(MOF)粉末与聚合物基材复合是获得高效气体分离膜的有效方法。然而,聚合物与填料之间微弱的相互作用通常会导致复合材料形成非选择性裂缝。在此,我们报告了一种通过磁控溅射和气相生长合成的具有连续致密 MOF 层的 MOF 聚合物复合膜。一种热重排聚(苯并恶唑)(TR-PBO)膜是由羟基聚酰亚胺前体通过热重排反应转化而来的,它被用作复合膜的聚合物支撑。通过磁控溅射技术在 TR-PBO 支撑物上沉积了一层超薄的 ZnO 种子层,然后通过气相生长将其转化为 ZIF-8 层。扫描电子显微镜结果证实形成了致密、平整和连续的 ZIF 层,厚度约为 450-600 nm。ZIF-8 纳米颗粒大小一致,分布均匀。此外,附着的 ZIF 层显著提高了复合膜的气体选择性,这应归功于 ZIF-8 独特孔隙结构的筛分效应。磁控溅射与气相生长相结合的方法能有效提高气体分离膜的选择性,减少 MOF 颗粒的聚集,为设计扁平超薄气体分离复合膜开辟了道路。
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来源期刊
CiteScore
7.20
自引率
6.00%
发文量
810
期刊介绍: ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.
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