High strength and biodegradable dielectric film with synergistic alignment of chitosan nanofibrous networks and BNNSs

Hu Tu; Xiaoyan Li; Kang Xie; Jipeng Zhang; Yuncui Liu; Xiaoyu Shao; Xinghuan Lin; Ruquan Zhang; Bo Duan

doi:10.1016/j.carbpol.2022.120234

High strength and biodegradable dielectric film with synergistic alignment of chitosan nanofibrous networks and BNNSs

Carbohydr Polym. 2023 Jan 1:299:120234. doi: 10.1016/j.carbpol.2022.120234. Epub 2022 Oct 17.

Authors

Hu Tu¹, Xiaoyan Li², Kang Xie³, Jipeng Zhang⁴, Yuncui Liu², Xiaoyu Shao², Xinghuan Lin⁴, Ruquan Zhang⁵, Bo Duan⁶

Affiliations

¹ State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, China; College of Chemistry and Molecular Sciences, Hubei Engineering Center of Natural Polymer-based Medical Materials and Key Laboratory of Biomedical Polymers of Ministry of Education, Wuhan University, Wuhan 430072, China.
² State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, China.
³ College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
⁴ College of Chemistry and Molecular Sciences, Hubei Engineering Center of Natural Polymer-based Medical Materials and Key Laboratory of Biomedical Polymers of Ministry of Education, Wuhan University, Wuhan 430072, China.
⁵ State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, China. Electronic address: zhangruquan@wtu.edu.cn.
⁶ College of Chemistry and Molecular Sciences, Hubei Engineering Center of Natural Polymer-based Medical Materials and Key Laboratory of Biomedical Polymers of Ministry of Education, Wuhan University, Wuhan 430072, China. Electronic address: bo_duan@whu.edu.cn.

PMID: 36876829
DOI: 10.1016/j.carbpol.2022.120234

Abstract

The development of biodegradable and robust dielectric capacitors with high breakdown strength and energy density are indispensable. Herein, the high strength chitosan/edge hydroxylated boron nitride nanosheets (BNNSs-OH) dielectric film was fabricated via combining the dual chemically-physically crosslinking and the drafting orientation strategy, which could induced BNNSs-OH and chitosan crosslinked network alignment within the film via covalent and hydrogen bonding interaction, leading to the comprehensive reinforcement of tensile strength from 126 to 240 MPa, the E_b from 448 to 584 MV m^-1, the in-plane thermal conductivity from 1.46 to 5.95 W m^-1 K^-1 and energy storage density from 7.22 to 13.71 J cm^-1, superior than the comprehensive evaluation of the reported polymer dielectrics. The dielectric film could be completely degraded in soil in 90 days, which opened a new path for the development of next-generation environment-friendly dielectrics with excellent mechanical and dielectric properties.

Keywords: Biodegradable; Boron nitride nanosheets; Chitosan; Dielectric; High strength.