Meckler Stephen M, Bachman Jonathan E, Robertson Benjamin P, Zhu Chenhui, Long Jeffrey R, Helms Brett A
The Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, CA, 94720, USA.
Department of Chemistry, The University of California, Berkeley, Berkeley, CA, 94720, USA.
Angew Chem Int Ed Engl. 2018 Apr 23;57(18):4912-4916. doi: 10.1002/anie.201800556. Epub 2018 Mar 5.
The influence of segmental chain motion on the gas separation performance of thermally rearranged (TR) polymer membranes is established for TR polybenzoxazoles featuring Tröger's base (TB) monomer subunits as exceptionally rigid sites of contortion along the polymer backbone. These polymers are accessed from solution-processable ortho-acetate functionalized polyimides, which are readily synthesized as high-molecular-weight polymers for membrane casting. We find that thermal rearrangement leads to a small increase in d-spacing between polymer chains and a dramatic pore-network reconfiguration that increases both membrane permeability and O /N selectivity, putting its performance above the 2015 upper bound.
对于以特罗格碱（TB）单体亚基作为沿聚合物主链扭曲的异常刚性位点的热重排（TR）聚苯并恶唑，确定了链段运动对热重排（TR）聚合物膜气体分离性能的影响。这些聚合物由可溶液加工的邻乙酸酯官能化聚酰亚胺制得，可容易地合成高分子量聚合物用于膜浇铸。我们发现热重排导致聚合物链之间的d间距略有增加以及显著的孔网络重构，这增加了膜的渗透率和O₂/N₂选择性，使其性能高于2015年的上限。
Zotero 插件