Abstract In order to address the need for more efficient technologies for carbon capture applications, a novel type of nanocellulose based hybrid membrane has been successfully prepared by blending the commercial Polyvinylamine solution Lupamin® 9095 (BASF) with Nano Fibrillated Cellulose (NFC) to improve its mechanical and separation capabilities. Self-standing films with different nanocellulose loading (from 30 to 70 wt%) have been prepared and characterized at 35 °C through water vapor sorption experiments and humid gas permeation tests. As expected, membrane permeability consistently increased with increasing water vapor and a higher presence of Lupamin in the film resulted in an increment of both gas permeability and selectivity. In particular blends with a NFC content of 70 wt% Lupamin reached an ideal selectivity of 135 for the separation of CO2/CH4 and 218 for CO2/N2, at 60 RH%, while the maximum permeability in the order of 187 Barrer was instead reached at 80% RH. Water vapor solubility was also measured and modeled through Park Model to correlate the gas separation properties with the effective content of water present in the membrane matrix. As expected, a higher content of the hydrophilic polymer resulted in a larger water uptake, which at medium to high humidity appeared to trigger a water clustering phenomenon in the matrix. This fact was accompanied by a substantial relaxation of the polymer network, causing a marked reduction of selectivity, which dropped, at the highest RH investigated, to values in the order of 30 and 80 towards CH4 and N2 respectively. Despite this loss in performance, most materials tested still showed very interesting properties, well above Robeson's 2008 Upper Bound, making them an interesting alternative for traditional gas separation processes.

中文翻译：

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湿度和纳米纤维素含量对用于 CO 2 捕获的聚乙烯胺-纳米纤维素杂化膜的影响

摘要 为了满足碳捕获应用对更高效技术的需求，通过将商用聚乙烯胺溶液 Lupamin® 9095 (BASF) 与纳米原纤化纤维素 (NFC) 共混，成功制备了一种新型纳米纤维素基杂化膜，以提高其性能。机械和分离能力。已经制备了具有不同纳米纤维素负载量（从 30 到 70 wt%）的自支撑薄膜，并通过水蒸气吸附实验和湿气渗透测试在 35°C 下进行了表征。正如预期的那样，膜渗透性随着水蒸气的增加而持续增加，并且膜中 Lupamin 的存在导致气体渗透性和选择性增加。特别是 NFC 含量为 70 wt% Lupamin 的共混物在 60 RH% 下达到了分离 CO2/CH4 的理想选择性为 135，分离 CO2/N2 的选择性为 218，而最大渗透率则达到了 187 Barrer在 80% 相对湿度下。水蒸气溶解度也通过 Park 模型进行测量和建模，以将气体分离特性与膜基质中存在的有效水含量相关联。正如预期的那样，亲水性聚合物的含量越高，吸水量越大，这在中高湿度下似乎会引发基质中的水聚集现象。这一事实伴随着聚合物网络的显着松弛，导致选择性显着降低，在所研究的最高 RH 下，分别下降到 CH4 和 N2 的 30 和 80 左右的值。