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The effect of TiO2 nanoparticles on gas transport properties of Matrimid5218-based mixed matrix membranes

机译：TiO2纳米颗粒对基于Matrimid5218的混合基质膜的气体输运性能的影响

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In this study, the effect of TiO2 nanoparticles addition on mixed matrix membranes (MMMs) based on Matrimd5218 prepared by using solution-casting method has been investigated. The morphology of MMM was evaluated by Scanning Electron Microscopy (SEM). TiO2 nanoparticles distribution in matrimid matrix and top surface of membrane films was observed by Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM), respectively. It was found that at low particle loadings (less than 15%) nanoparticles were mainly dispersed individually forming nanoscale aggregates. However, at high volume fractions (more than 20%) the size of aggregates increases and micro-scale aggregates form. The permeability of N2, CH4, O2, CO2 and He have been measured in order to determine the effect of TiO2 on gas separation performance of Matrimid5218. The results demonstrated that inclusion of TiO2 increases the gas permeability of MMMs possibly due to chain packing disruption, void formation at polymer-nanoparticle interface as well as within nanoparticle aggregates. For example, in MMMs containing 15vol.% TiO2, the permeability of N2, CH4 and CO2 increased up to 2.76, 3.3 and 1.86 times higher than pure matrimid respectively. Diffusivity coefficients of larger molecules obtained by time-lag method show that permeability enhancement is mainly affected by diffusivity increment. Finally, the results reveal that use of TiO2 nanoparticles improves membrane performance in CO2/CH4 separation and presents a trade-offline with similar slope compare to Robeson upper insertion bound.
机译：在这项研究中，研究了TiO2纳米粒子的添加对基于Matrimd5218的混合基质膜（MMM）的影响。 MMM的形态通过扫描电子显微镜（SEM）评估。分别通过透射电子显微镜（TEM）和原子力显微镜（AFM）观察了TiO2纳米颗粒在类软骨基质和膜膜顶面中的分布。发现在低的颗粒负载量（小于15％）下，纳米颗粒主要分散形成纳米级聚集体。但是，在高体积分数（大于20％）下，聚集体的尺寸会增加，并且会形成微米级聚集体。为了确定TiO2对Matrimid5218气体分离性能的影响，已测量了N2，CH4，O2，CO2和He的渗透性。结果表明，包含TiO2可能会增加MMM的气体渗透性，这可能是由于链堆积破裂，聚合物-纳米颗粒界面以及纳米颗粒聚集体内形成空隙。例如，在含15vol。％TiO2的MMM中，N2，CH4和CO2的渗透率分别增加了2.76倍，3.3倍和1.86倍，是纯马来酰亚胺的高。通过时滞方法获得的较大分子的扩散系数表明，渗透率的提高主要受扩散系数增加的影响。最后，结果表明，与Robeson上插入上限相比，使用TiO2纳米粒子改善了CO2 / CH4分离中的膜性能，并提出了具有相似斜率的折衷方案。

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