论文标题
co $ _2 $ subnano-Porous晶体膜的有效有效的运输机制
Effective and efficient transport mechanism of CO$_2$ in subnano-porous crystalline membrane of syndiotactic polystyrene
论文作者
论文摘要
与S-PS $ \ varepsilon $形式相比，详细研究了集型聚苯乙烯（S-PS）S-I形式的单晶的气体渗透行为。 S-I表格展示了高co $ _2 $/n $ _2 $和CO $ _2 $/ch $ _4 $分离因子，同时保留其高CO $ _2 $渗透性；选择性与渗透率之间的权衡已经破坏。通过晶体中的腔结构，检查了CO $ _2 $在S-I形式中的有效运输的机制。由于Co $ _2 $分子仅适用于S-I形式的腔，因此Co $ _2 $的溶解度变得很高。另外，与二下分子相比，三原子分子可以在S-1形式中更有效地扩散，如“ Long-Gas”模型所证明的那样。 CO $ _2 $分离膜的新型设计标准是根据从聚合物基质到渗透剂的动量转移方面提出的。
The gas permeation behavior in the single crystal of syndiotactic polystyrene (s-PS) S-I form was investigated in detail, in comparison to that in the s-PS $\varepsilon$ form. The S-I form exhibits high CO$_2$/N$_2$ and CO$_2$/CH$_4$ separation factors while preserving its high CO$_2$ permeability; a trade-off between selectivity and permeability was broken through.The mechanism of the effective and efficient transport of CO$_2$ in the S-I form was examined in relation to the cavity structure in the crystal. Because the CO$_2$ molecule is only fitted to the cavities in the S-I form, the solubility of CO$_2$ becomes high. In addition, tri-atomic molecules can more effectively diffuse in the S-I form compared with di-atomic molecules, as proved by the "long-gas" model. A novel design criterion for the CO$_2$ separation membranes is proposed based on the aspect of momentum transfer from polymer matrix to the penetrant.
