Molecular Mobility and Physical Aging of a Highly Permeable Glassy Polynorbornene as Revealed by Dielectric Spectroscopy,ACS Macro Letters

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Molecular Mobility and Physical Aging of a Highly Permeable Glassy Polynorbornene as Revealed by Dielectric Spectroscopy
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-07-18 00:00:00 , DOI: 10.1021/acsmacrolett.7b00456
Huajie Yin ₁ , Pavel Chapala ₂ , Maxim Bermeshev ₂ , Andreas Schönhals ₁ , Martin Böhning ₁

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Polymeric membranes represent a cost- and energy-efficient solution for gas separation. Recently superglassy polymers with high free volume outperform many conventional dense polymers in terms of gas permeability and selectivity. However, such polymers are prone to pronounced physical aging, resulting in a dramatic reduction in the gas permeability. Molecular mobility of polymer segments plays an important role in the physical aging and the gas transport performance of polymeric membranes. Molecular mobility and physical aging of a representative superglassy polynorbornene with very high gas permeability, PTCNSi2g, was monitored by using dielectric spectroscopy with state-of-the-art high-resolution analyzers. This work helps to shed some light on the structure–property relationship of superglassy polymers on a molecular level and to provide practical “design rules” for the development of high performance polymers for gas separation.

中文翻译：

介电谱显示高渗透性玻璃态聚降冰片烯的分子迁移率和物理老化

聚合物膜代表了气体分离的经济高效的解决方案。最近，就气体渗透率和选择性而言，具有高自由体积的超玻璃态聚合物优于许多传统的致密聚合物。但是，这样的聚合物易于明显的物理老化，导致气体渗透率显着降低。聚合物链段的分子迁移率在聚合物膜的物理老化和气体传输性能中起着重要作用。具有代表性的超玻璃化聚降冰片烯具有极高的气体渗透性PTCNSi2g，其分子迁移率和物理老化情况通过使用介电光谱仪和最新的高分辨率分析仪进行监测。

更新日期：2017-07-18

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