Effects of trimethylaluminum vapor pressure and exposure time on inorganic loading in vapor phase infiltrated PIM-1 polymer membranes
Effects of trimethylaluminum vapor pressure and exposure time on inorganic loading in vapor phase infiltrated PIM-1 polymer membranes
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DOI：
10.1016/j.matchemphys.2022.126577
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发表时间：
2022-08-05
影响因子：
4.6
通讯作者：
Losego, Mark D.
中科院分区：
文献类型：
--
作者：
Jean, Benjamin C.;Ren, Yi;Losego, Mark D.
气相渗透（VPI）是一种聚合后改性方法，用于将无机团簇注入聚合物中，以产生具有与母体聚合物独特的性能的有机-无机杂化材料。这些杂化材料的性质可以随着VPI产生的无机负载量而变化。然而，VPI加工条件和无机负载之间的关系仍然没有完全理解。在本文中，VPI剂量压力和曝光时间对无机负载的影响进行了探讨，使用技术相关的膜材料被称为“聚合物的固有微孔1”（PIM-1）。在足够低的剂量压力和渗透时间（即，在饱和之前），无机负载可以用蒸气压和暴露时间两者来控制。然而，无机负载似乎饱和时，该系统的聚合物的官能团变得完全填充绑定VPI前体。这些实验结果可以理解与使用最近开发的反应扩散模型VPI。将该模型应用于这些沉积后测量的关键是将质量负载重新归一化为聚合物中官能团的总数。
Vapor phase infiltration (VPI) is a post-polymerization modification method for infusing inorganic clusters into a polymer to create organic-inorganic hybrid materials with properties that are unique from the parent polymer. The properties of these hybrid materials can vary with the amount of VPI generated inorganic loading. However, the relationship between VPI processing conditions and inorganic loading is still not fully understood. In this paper, the effects of VPI dose pressure and exposure time on inorganic loading are explored using the technologically relevant membrane material known as "polymer of intrinsic microporosity 1 " (PIM-1). At sufficiently low dose pressures and infiltration times (i.e., before saturation), inorganic loading can be controlled with both vapor pressure and exposure time. However, inorganic loading appears to saturate for this system when the polymer's functional groups become fully populated with bound VPI precursors. These experimental results can be understood with the use of a recently developed reaction-diffusion model for VPI. Critical to applying this model to these post-deposition measurements is re-normalizing the mass loading to the total number of functional groups in the polymer.