摘要
丝素蛋白的分子结构兼具软段和硬段,且其结构单元具有较大的偶极矩(3.5D),在介电储能领域可能具有应用潜力.本文表征了丝素蛋白薄膜的在高电场下的介电性能,并研究了丝素蛋白的分子结构与高电场下介电性能的关系.结果显示,丝素蛋白的二级结构变化与其高场介电行为关系密切,β-折叠结构增加有利于提高击穿强度,降低介电损耗.通过调整薄膜的制备工艺优化了丝素蛋白薄膜的高场介电性能,优化后的丝素蛋白膜在500 MV/m的电场下放电能量密度可达7.43 J/cm^(3),充-放电效率为79.8%.本工作为开拓丝素蛋白在介电领域的应用提供了基础数据,并为进一步优化分子结构提供了参考.
Silk fibroin shows promising potential in dielectric and electrical energy storage application since that its structure unit has a large dipole moment(3.5 D)and its molecular structure has both soft and hard segments.In this study,for the first time,the dielectric properties of silk fibroin film under high electrical fields are investigated and the emphasis is given on the relationship between secondary structures and dielectric properties under high electrical fields.The results show that under high electrical fields,the change in the secondary structures of the silk fibroin is closely associated with its dielectric behavior.Specifically,the increase of theβ-sheet structure is beneficial for the electrical strength enhancement and suppressing the dielectric loss of silk fibroin film.In addition,the high-field dielectric properties are significantly boosted by optimizing the preparation process of the silk fibroin film.The optimized film has a discharge energy density of 7.43 J/cm^(3) and a charge-discharge efficiency of 79.8%under an electrical field of 500 MV/m,which demonstrates a promissing energy storage capability.This work provides basic data for exploring the application of silk fibroin in the dielectric field and also gives reference for further optimization of molecular structure in the future.
作者
王思琦
陈杰
朱荧科
江平开
黄兴溢
Si-qi Wang;Jie Chen;Ying-ke Zhu;Ping-kai Jiang;Xing-yi Huang(Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing,Shanghai Jiao Tong University,Shanghai 200240)
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2021年第9期1148-1155,共8页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号51877132)
中国博士后科学基金(基金号2019M661479)资助项目。
关键词
丝素蛋白
高电场
介电性能
储能性能
Silk fibroin
High electric field
Dielectric properties
Energy storage properties
