Ternary composite films with simultaneously enhanced strength and ductility: Effects of sodium alginate-gelatin weight ratio and graphene oxide content.
Ternary composite films with simultaneously enhanced strength and ductility: Effects of sodium alginate-gelatin weight ratio and graphene oxide content.
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DOI：
10.1016/j.ijbiomac.2020.04.057
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发表时间：
2020-04
影响因子：
8.2
通讯作者：
Liu Yang;Jieyu Yang;Xiaolin Qin;Jianquan Kan;Fankun Zeng;Jinfeng Zhong
中科院分区：
文献类型：
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作者：
Liu Yang;Jieyu Yang;Xiaolin Qin;Jianquan Kan;Fankun Zeng;Jinfeng Zhong
本研究旨在通过在海藻酸钠(SA)-明胶薄膜体系中添加氧化石墨烯(GO)来同时提高薄膜的强度和延展性，以制备SA-明胶-GO三元复合膜。研究了SA/明胶质量比和GO含量对复合膜的形貌、结构、力学性能、疏水性、水蒸气阻隔性、吸湿性和光学性能的影响。结果表明，与不含GO的SA-明胶复合膜相比，GO含量为0.5%的SA-明胶复合膜的拉伸强度和断裂伸长率分别从37.00~48.01 Mpa和20.19%~25.75%显著提高，说明0.5%的GO同时提高了SA-明胶复合膜的强度和延展性，这是由于GO在膜中具有良好的分散性和氢键的相互作用。随着GO含量的增加，复合膜的表面疏水性先增大后减小。此外，GO的加入降低了复合膜的吸湿性，尤其是当GO含量为0.25%时更是如此。SA-明胶-GO三元复合膜为食品包装材料，特别是对强度和延展性要求较高的材料提供了良好的选择。
This study aimed to simultaneously enhance the strength and ductility of films by adding graphene oxide (GO) into the sodium alginate (SA)-gelatin film system to prepare SA-gelatin-GO ternary composite films. The effects of the SA/gelatin weight ratio and the GO content on the morphology, structural, mechanical, hydrophobic, water vapor barrier, hygroscopic, and optical properties of composite films were investigated. Results showed that tensile strength and elongation at break values of the composite film with 0.5% GO content were significantly improved from 37.00 to 48.01 MPa and 20.19% to 25.75%, respectively, compared with the SA-gelatin film without GO, suggesting GO with the content of 0.5% simultaneously enhance the strength and ductility of the SA-gelatin film, which was due to the interaction of hydrogen bonds and the good dispersibility of GO in the film matrix. The surface hydrophobicity of composite films increased first and then decreased with increasing GO content. In addition, the hygroscopicity of composite films reduced due to the GO addition, especially when the GO content was 0.25%. The SA-gelatin-GO ternary composite films provide a good select for food packaging materials, especially the materials that require high strength and fine ductility.