Muroran Institute of Technology, Japan.
Research Center for Environmentally Friendly Materials Engineering, Muroran Institute of Technology, 050-8585, 27-1 Mizumoto-cho, Muroran-shi, Hokkaido, Japan.
Mater Sci Eng C Mater Biol Appl. 2019 Apr;97:431-437. doi: 10.1016/j.msec.2018.12.060. Epub 2018 Dec 19.
We investigate the mechanical properties and structure of silk resins as potential alternatives to tortoiseshell for producing eyeglass frames and various ornaments. Silk powders are obtained from Bombyx mori and Eri silk waste fibers before the degumming process. The powders are fabricated into resins via simple hot pressing under a pressure of 31.2 MPa at temperatures in the range 150-180 °C. The results indicate that the B. mori resins have higher micro-Vickers hardness, three-point bending strength, and elastic modulus (66 Hv, 122 MPa, and 8.7 GPa, respectively) compared to the Eri silk resins (58 Hv, 95 MPa, and 8.2 GPa, respectively). The better mechanical properties of the fibroin resins are related directly to longer drying times. The optimum drying conditions are found to be at a temperature of 100 °C under a-vacuum of -0.1 MPa for a time of 7 d. ATR-FTIR and XRD results show how the fibroin structure changes after resinification and drying. The morphology and the distribution size of particle of the silk powders and the fractured surfaces of the resins are analyzed from SEM micrographs. The present findings demonstrate that silk resins are suitable materials for developing useful applications because of their favorable mechanical properties.
我们研究了丝树脂的力学性能和结构，以期将其作为龟甲的替代品，用于生产眼镜框和各种装饰品。丝粉是从桑蚕丝和柞蚕丝废料纤维中提取的，然后进行脱胶处理。将这些粉末通过简单的热压工艺，在 31.2 MPa 的压力下，于 150-180°C 的温度范围内制成树脂。结果表明，与柞蚕丝树脂（58Hv、95MPa 和 8.2GPa）相比，桑蚕丝树脂具有更高的微维氏硬度、三点弯曲强度和弹性模量（分别为 66Hv、122MPa 和 8.7GPa）。丝素树脂具有更好的力学性能，这与更长的干燥时间直接相关。发现最佳干燥条件是在 100°C 下，真空度为-0.1MPa，干燥时间为 7d。ATR-FTIR 和 XRD 结果表明了丝素结构在树脂化和干燥后的变化。从 SEM 显微照片分析了丝粉的形貌和颗粒分布尺寸以及树脂的断裂表面。本研究结果表明，由于丝树脂具有良好的力学性能，因此非常适合开发有用的应用。
