Preparation and characterization of cellulose acetate membranes with TEMPO-oxidized cellulose nanofibrils containing alkyl ammonium carboxylates.
Preparation and characterization of cellulose acetate membranes with TEMPO-oxidized cellulose nanofibrils containing alkyl ammonium carboxylates.
复制标题
含有烷基羧酸铵的 TEMPO 氧化纤维素纳米纤丝的醋酸纤维素膜的制备和表征。
DOI：
10.1007/s10570-019-02872-5
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发表时间：
2020
期刊：
影响因子：
5.7
通讯作者：
A.
中科院分区：
文献类型：
--
作者：
Shimizu;M.;Alvarez-Asencio;R.;Nordgren;N.;Uedono;A.
醋酸纤维素（CA）膜由于几个优点已广泛用于水净化，例如，生物相容性和低结垢率。然而，与其他聚合物膜相比，它们具有较低的水通量。因此，在这项研究中，CA膜共混与2，2，6，6-四甲基哌啶-1-氧基（克里思）-氧化纤维素纳米纤维（T-CNFs）含有季烷基铵（QA）羧酸盐，以提高其水通量。正电子湮没寿命谱显示，随着季铵盐烷基链长度的增加，CA膜的正电子寿命和强度分别增加和降低。这表明当使用含有具有较长烷基链的QA的T-CNF时，CA膜具有较大且较少的孔。这些膜的纯水通量也增加了与QA的烷基链的长度，但它们的截留率（Rj）相应地下降。然而，它们显示出用作超滤膜的潜力，允许对白蛋白的99% Rj。当与T-CNFs共混时，CA膜的拉伸强度、断裂应变和断裂功增加。使用原子力显微镜胶体探针技术进行的力测量表明，膜成分之间的粘附力取决于它们的表面化学性质。这表明在共混膜中观察到的结构差异可能是由于CA和含有具有不同烷基链长度的QA的T-CNF之间的亲和力。该研究表明，CA膜的性质可以通过添加具有不同表面化学性质的T-CNF来定制。
Cellulose acetate (CA) membranes have been widely used for water purification owing to several advantages, e.g., biocompatibility and low fouling rate. However, they suffer from a lower water flux compared to the other polymeric membranes. Therefore, in this study, CA membranes were blended with 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (T-CNFs) containing quaternary alkyl ammonium (QA) carboxylates to improve their water flux. When increasing the alkyl chain length of the QAs, the positron lifetime and intensity of the CA membranes increased and decreased respectively, as revealed via positron annihilation lifetime spectroscopy. This indicated that the CA membranes had larger and fewer pores when using the T-CNFs containing QAs with longer alkyl chains. The pure water flux of these membranes also increased with the alkyl chain lengths of QAs although their rejection rate (Rj) decreased accordingly. However, they revealed a potentiality to be used as ultrafiltration membranes, allowing a 99% Rj for albumin. The tensile strength, strain to failure, and work of fracture of the CA membranes increased when blended with T-CNFs. Force measurements using the AFM colloidal probe technique showed that the adhesion between the membrane constituents depends on their surface chemistry. This indicated that the structural differences observed among the blended membranes may be due to the affinity between CA and T-CNF containing QAs with different alkyl chain lengths. This study demonstrates that the properties of CA membranes can be tailored by the addition of T-CNFs with different surface chemistries.