Evidence for Size-Sieving Driven Vapor Sorption and Diffusion in a Glassy Polybenzoxazole Exhibiting Configurational Free Volume
Evidence for Size-Sieving Driven Vapor Sorption and Diffusion in a Glassy Polybenzoxazole Exhibiting Configurational Free Volume
复制标题
具有构型自由体积的玻璃状聚苯并恶唑中尺寸筛分驱动的蒸气吸附和扩散的证据
DOI：
10.1021/acs.iecr.1c02660
复制
发表时间：
2021
影响因子：
4.2
通讯作者：
Galizia, Michele
中科院分区：
文献类型：
--
作者：
Box, William J.;Huang, Zihan;Guo, Ruilan;Galizia, Michele
本文首次报道了构型自由体积（即，三蝶烯单元）对聚合物中可冷凝蒸气传输的影响。在25 °C下，在含三蝶烯的聚苯并恶唑（TPBO）中的醇和水蒸气溶解度和扩散系数等温线表现出构型自由体积，作为蒸气活性的函数，进行了讨论，并用于开发基本的结构-性能相关性。这项研究提供的证据表明，虽然在传统的玻璃状聚合物中，醇的扩散是尺寸控制和吸附是结晶控制，这可能会产生吸附和扩散选择性之间的权衡，醇的吸附和扩散在TPBO都是尺寸控制，这使得它可能更容易同时调整吸附和扩散选择性，以实现高选择性的分离。为了把这些结果在一个广泛的角度来看，酒精的吸附和扩散性能的TPBO进行了比较与传统的玻璃状聚合物表现出构象自由体积，如PIM-1，聚四氟乙烯AF 2400，聚苯乙烯，聚砜，以及橡胶PDMS。最后，新的令人兴奋的机会，利用这些独特的TPBO的大规模分子分离的功能进行了讨论。
This paper reports, for the first time, the effect of configurational free volume (i.e., triptycene units) on condensable vapor transport in polymers. Alcohol and water vapor solubility and diffusivity isotherms at 25 °C in a triptycene-containing polybenzoxazole (TPBO) exhibiting configurational free volume are presented as a function of vapor activity, discussed, and used to develop fundamental structure–property correlations. This study provides evidence that while in conventional glassy polymers alcohol diffusion is size-controlled and sorption is enthalpy-controlled, which may create a trade-off between sorption- and diffusion-selectivity, alcohol sorption and diffusion in TPBO are both size-controlled, which makes it potentially easier to simultaneously tune sorption- and diffusion-selectivity to achieve highly selective separations. To put these results in a broad perspective, alcohol sorption and diffusion properties of TPBO were compared with those of conventional glassy polymers exhibiting conformational free volume, such as PIM-1, Teflon AF2400, polynorbornene, polysulfone, as well as rubbery PDMS. Finally, new exciting opportunities to exploit these unique TPBO’s features for large scale molecular separations are discussed.
登录
查看更多内容
影响因子：
4.6
作者：
Merrick, Melanie M.;Sujanani, Rahul;Freeman, Benny D.
通讯作者：
Freeman, Benny D.
影响因子：
9.9
作者：
Rajeev Prabhakar;B. Freeman
通讯作者：
Rajeev Prabhakar;B. Freeman
影响因子：
9.5
作者：
Galizia, Michele;Stevens, Kevin A.;Freeman, Benny D.
通讯作者：
Freeman, Benny D.
影响因子：
4.2
作者：
Li, Yafei;Yavari, Milad;Galizia, Michele
通讯作者：
Galizia, Michele
影响因子：
4.2
作者：
Friess, Karel;Jansen, Johannes C.;Drioli, Enrico
通讯作者：
Drioli, Enrico