Multifunctional, flexible and mechanically resilient porous polyurea/graphene composite film

Cui X. Zhang C. Araby S. Cai R. Kalimuldina G. Yang Z. Meng Q.
25 January 2022 Korean Society of Industrial Engineering Chemistry

Journal of Industrial and Engineering Chemistry
2022 #105 549 - 562 pp.

In this study, a porous polyurea/graphene platelet (GnP) composite film with high flexibility and multifunctionality was developed and investigated for strain sensing and energy storage applications. Morphology and mechanical properties were studied; tensile strength and Youngs modulus were enhanced by 132% and 900%, respectively at 5 wt% GnPs. The polyurea/GnP film exhibited high sensitivity to various strains– namely, tension, compression, bending and twisting. In tensile strain, gauge factor was 1.86 and 6.26 within strain ranges of 0–30% and 30–60%, respectively. Interestingly, the film showed piezoresistive and capacitive-type strain sensor under compression load; a 33% increase in relative resistance with response time of 108 millisecond; and 22% increase in relative capacitance with response time of 92 millisecond when load of 5 kPa was applied. Furthermore, the strain sensor showed high durability and reliability over 20,000 cycles. The developed polyurea/GnP film showed a stable capacitive performance over 20,000 charge–discharge cycles. This work provides important insights for the potential of polyurea/graphene films in multifunctional sensors and flexible energy storage applications.

Flexible electrode , Graphene , Polyurea , Porous film , Strain sensor

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College of Civil Aviation, Shenyang Aerospace University, Shenyang, 110136, China
College of Aerospace Engineering, Shenyang Aerospace University, 37 Daoyi South Avenue, Shenyang, 110136, Liaoning, China
Department of Mechanical and Aerospace Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
School of Mechanical, Aerospace and Automotive Engineering, Coventry University, Coventry, CV1 2JH, United Kingdom
School of Mechanical Technology, Wuxi Institute of Technology, Wuxi, 214121, China

College of Civil Aviation
College of Aerospace Engineering
Department of Mechanical and Aerospace Engineering
School of Mechanical
School of Mechanical Technology

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