Polymer-Grafted Nanoparticle Membranes with Controllable Free Volume
Polymer-Grafted Nanoparticle Membranes with Controllable Free Volume
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DOI：
10.1021/acs.macromol.7b01428
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发表时间：
2017-09-26
期刊：
影响因子：
5.5
通讯作者：
Doghieri, Ferruccio
中科院分区：
文献类型：
--
作者：
Bilchak, Connor R.;Buenning, Eileen;Doghieri, Ferruccio
基于聚合物的膜在几种工业上重要的气体分离技术中起关键作用，例如，从天然气中去除二氧化碳，具有巨大的经济和环境影响。在这里，我们开发了一种新的混合膜结构完全由纳米粒子接枝聚合物。这些膜显示出通过接枝密度和链长的变化具有广泛可调的分离性能。计算机模拟表明，最佳的NP填充迫使接枝聚合物层扭曲，产生可测量的较低聚合物密度的区域。多个实验探针证实，这些材料具有预测的“聚合物自由体积”的增加，这解释了它们改进的分离性能。因此，这些聚合物接枝的NP材料代表了一种新的模板，用于合理地设计具有理想的分离能力的膜，该膜具有改善的玻璃态老化特性和增强的机械行为。
Polymer-based membranes play a key role in several industrially important gas separation technologies, e.g., removing CO2 from natural gas, with enormous economic and environmental impact. Here, we develop a novel hybrid membrane construct comprised entirely of nanoparticles grafted with polymers. These membranes are shown to have broadly tunable separation performance through variations in graft density and chain length. Computer simulations show that the optimal NP packing forces the grafted polymer layer to distort, yielding regions of measurably lower polymer density. Multiple experimental probes confirm that these materials have the predicted increase in "polymer free volume", which explains their improved separation performance. These polymer-grafted NP materials thus represent a new template for rationally designing membranes with desirable separation abilities coupled with improved aging characteristics in the glassy state and enhanced mechanical behavior.