氧化石墨烯掺杂丝素蛋白复合材料的结晶和力学特性

Crystallinity and Mechanical Property of Silk Fibroin/Graphene Oxide Composites

采用溶液混合法制备丝素蛋白(SF)/氧化石墨烯(GO)复合材料,并用扫描电镜(SEM)、傅里叶变换红外光谱、X射线衍射、动态力学分析表征了丝素蛋白分子链构象、微观形态和动态力学性能。结果表明,GO的掺杂促使SF向β-折叠构象转变,并且随着GO含量的提高,β-折叠的含量和材料拉伸储能模量(E')呈现先增后减的变化趋势,当GO质量分数为1.0%时达到最大值,此时复合材料的E'较SF膜提高了约157%。

Silk fibroin（ SF） / graphene oxide（ GO） composites were prepared by solution casting method. The SF molecular conformation,micromorphology and dynamic mechanical property of composites were analyzed by SEM,FTIR,XRD and dynamic mechanical analysis（ DMA）. It is found that the SF molecular conformation shows a transition from random coils to β-sheets along with incorporating GO into SF. With the GO content increasing,both β-sheets structure percentage and tensile storage modulus（ E＇） trend to increase firstly,and then decrease,and both reach maximum values when the GO content is 1. 0wt%. The E＇ of composite films is improved by 157% in comparison with pristine SF film.