College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi Province 710021, China.
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi Province 710021, China.
Int J Biol Macromol. 2019 Feb 15;123:991-1001. doi: 10.1016/j.ijbiomac.2018.11.184. Epub 2018 Nov 20.
A series of epichlorohydrin-couple-linked cellulose-gelatin composite films (ECGF) was fabricated in NaOH/urea aqueous solution using a process involving homogenous blending, coupling, dialysis, self-dispersion, microgel solution casting, and evaporation. Their structure and properties were characterized with elemental analysis, Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (H NMR), gel permeation chromatography (GPC), scanning electron microscope (SEM), atomic force microscopy (AFM), ultraviolet-visible (UV-vis) spectroscopy, water vapor permeability, and mechanical testing. The results showed that the self-dispersed cellulose-gelatin microgels were successfully prepared and the coupling interactions existed in the inter- and intra-molecules of the corresponding composite films during the fabrication process. The water vapor permeability of the ECGF films was improved when the protein content was higher than 30 wt% in composite films at 75% relative humidity. Interestingly, compared with the cellulose/protein composite films prepared via phase separation method, ECGF films exhibited more homogeneous surface and compact cross-section structures, as well as presented higher light transmittance at 400 nm of about 88% and relative lower swelling ratio. Moreover, ECGF films displayed higher tensile strength compared with that of water-soluble cellulose derivatives/protein composite films in dry and wet states.
采用均相共混、偶联、透析、自分散、微凝胶溶液浇铸和蒸发的方法，在 NaOH/尿素水溶液中制备了一系列的表氯醇偶联纤维素-明胶复合膜（ECGF）。采用元素分析、傅里叶变换红外光谱（FTIR）、质子核磁共振（H NMR）、凝胶渗透色谱（GPC）、扫描电子显微镜（SEM）、原子力显微镜（AFM）、紫外-可见（UV-vis）光谱、水蒸气透过率和力学性能测试对其结构和性能进行了表征。结果表明，成功制备了自分散的纤维素-明胶微凝胶，在制备过程中相应的复合膜的分子内和分子间存在偶联相互作用。当复合膜中蛋白质含量高于 30wt%时，在 75%相对湿度下，ECGF 膜的水蒸气透过率得到提高。有趣的是，与通过相分离法制备的纤维素/蛋白质复合膜相比，ECGF 膜具有更均匀的表面和更致密的横截面结构，在 400nm 处的光透过率约为 88%，相对较低的溶胀率。此外，ECGF 膜在干燥和湿润状态下的拉伸强度均高于水溶性纤维素衍生物/蛋白质复合膜。
