Study on the Variation of Crystal Properties of Chitin/Silk Fibroin Biocomposite Films
ZHANG Yulu1,2, HU Qian1, YE Qian1, WU Jiaxi1, LI Qiushi1, SU Ganmao1, DU Guanben1,2, XU Kaimeng1,2
1 International Joint Research Center for Biomass Materials, Chinese Ministry of Science and Technology, Southwest Forestry University, Kunming 650224, China 2 School of Materials Science and Engineering, Southwest Forestry University, Kunming 650224, China
Abstract: Chitin (CT) and silk fibroin (SF) were selected as raw materials inspired by the chemical component of crustacean shell cuticle. The CT/SF biocomposite films were prepared by a facile casting method with the various CT/SF ratios and drying conditions (conventional and vacuum drying). The crystalline properties and the variation of other related characteristics for the biocomposite film were characterized by SEM, FTIR, UV-Vis, TG, XRD and electronic mechanical testing machine. The results show that as the ratio of m(CT)∶m(SF) varies from 1∶4 to 4∶1, the crystal appearance of the CT/SF biocomposite film gradually transforms from a loose ‘radial dotted line' to a dense ‘filiform net' under the conventional drying, while from “snow flower-like” to “worm-like” and then to “dotted line” under the vacuum drying. The drying condition plays a significant role on the variation of micro-morphology of the crystals of the biocomposite film when the ratio of m(CT)∶m(SF) is 4∶1, changing from the ‘scaly layer' under the conventional drying to the ‘cactus ball' under the vacuum drying. Meanwhile, some microcrystals with a diameter of about 60 nm appear in the biocomposite film without crystallization at the same ratio. The biocomposite film with a m(CT)∶m(SF) ratio of 1∶4 under the conventional drying exhibits the highest average transmittance (97.3%) when the wavelength of visible light is beyond 500 nm.The non-crystalline biocomposite film with the m(CT)∶m(SF) ratio of 4∶1 under the vacuum drying shows the optimum comprehensive mechanical properties and thermal stability, corresponding to the tensile strength and elongation at break of 1.28 MPa and 134%, respectively.
张钰禄, 胡谦, 叶倩, 吴佳喜, 李秋实, 苏柑锚, 杜官本, 徐开蒙. 甲壳素/丝素蛋白复合薄膜结晶特性变化研究[J]. 材料导报, 2022, 36(11): 20100142-6.
ZHANG Yulu, HU Qian, YE Qian, WU Jiaxi, LI Qiushi, SU Ganmao, DU Guanben, XU Kaimeng. Study on the Variation of Crystal Properties of Chitin/Silk Fibroin Biocomposite Films. Materials Reports, 2022, 36(11): 20100142-6.
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