Ren Xiuxiu, Kanezashi Masakoto, Guo Meng, Xu Rong, Zhong Jing, Tsuru Toshinori
Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China.
Separation Engineering Laboratory, Department of Chemical Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan.
Membranes (Basel). 2021 Mar 11;11(3):194. doi: 10.3390/membranes11030194.
A new polyhedral oligomeric silsesquioxane (POSS) designed with eight -(CH)-NH-(CH)-NH groups (PNEN) at its apexes was used as nanocomposite uploading into 1,2-bis(triethoxysilyl)ethane (BTESE)-derived organosilica to prepare mixed matrix membranes (MMMs) for gas separation. The mixtures of BTESE-PNEN were uniform with particle size of around 31 nm, which is larger than that of pure BTESE sols. The characterization of thermogravimetric (TG) and gas permeance indicates good thermal stability. A similar amine-contained material of 3-aminopropyltriethoxysilane (APTES) was doped into BTESE to prepare hybrid membranes through a copolymerized strategy as comparison. The pore size of the BTESE-PNEN membrane evaluated through a modified gas-translation model was larger than that of the BTESE-APTES hybrid membrane at the same concentration of additions, which resulted in different separation performance. The low values of E(CO)-E(N) and E(N) for the BTESE-PNEN membrane at a low concentration of PNEN were close to those of copolymerized BTESE-APTES-related hybrid membranes, which illustrates a potential CO separation performance by using a mixed matrix membrane strategy with multiple amine POSS as particles.
一种新型的多面体低聚倍半硅氧烷（POSS），其顶点设计有八个-(CH)-NH-(CH)-NH基团（PNEN），被用作纳米复合材料，负载到由1,2-双（三乙氧基硅基）乙烷（BTESE）衍生的有机硅中，以制备用于气体分离的混合基质膜（MMM）。BTESE-PNEN的混合物均匀，粒径约为31nm，大于纯BTESE溶胶的粒径。热重（TG）和气体渗透率表征表明其具有良好的热稳定性。作为对比，通过共聚策略将类似的含胺材料3-氨丙基三乙氧基硅烷（APTES）掺杂到BTESE中以制备混合膜。在相同添加浓度下，通过改进的气体传输模型评估的BTESE-PNEN膜的孔径大于BTESE-APTES混合膜的孔径，这导致了不同的分离性能。在低浓度PNEN下，BTESE-PNEN膜的E(CO)-E(N)和E(N)的低值接近共聚的BTESE-APTES相关混合膜的低值，这说明了通过使用以多胺POSS为颗粒的混合基质膜策略具有潜在的CO分离性能。
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