Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
IEQUALTECS, Lda. Rua Cavaleiros da Espora Dourada, n°15 2560-668 Torres Vedras, Portugal.
Carbohydr Polym. 2018 Jun 1;189:342-351. doi: 10.1016/j.carbpol.2018.02.030. Epub 2018 Feb 16.
Hybrid cellulose acetate (CA) silica (SiO) (CA/SiO) membranes were synthesized by promoting the in situ condensation between silanols from the SiO precursor and the COH or acetate groups from the CA polymer. For all the CA/SiO membranes, the ATR-FTIR peak assigned to (SiOC) proves the hybrid condensation reaction and confirms the synthesis of monophasic hybrid membranes. ATR-FTIR shows the presence of uncondensed highly reactive SiOH species, in membranes with silica contents higher than 20 mol%. Together with RMN studies, results show molecular water strongly hydrogen-bonded with SiOH groups, yielding a drastic decrease in the membrane hydraulic permeability, from 57 to 10 kg/h/m/bar. The incorporation of 5 and 10 mol% of silica increased the hydraulic permeability from 32 to 82 kg/h/m/bar when compared to the CA membrane.
通过促进 SiO 前体中的硅醇与 CA 聚合物中的 COH 或乙酸酯基团之间的原位缩合反应，合成了混合醋酸纤维素（CA）二氧化硅（SiO）（CA/SiO）膜。对于所有 CA/SiO 膜，ATR-FTIR 峰分配给（SiOC）证明了杂化缩合反应，并证实了单相杂化膜的合成。ATR-FTIR 显示出存在未缩合的高反应性 SiOH 物质，在二氧化硅含量高于 20 mol%的膜中。与 RMN 研究一起，结果表明，分子水与 SiOH 基团强烈氢键结合，导致膜水力渗透率从 57 到 10 kg/h/m/bar 急剧下降。与 CA 膜相比，当掺入 5 和 10 mol%的二氧化硅时，水力渗透率从 32 增加到 82 kg/h/m/bar。
