Comparative study on the mechanical and dielectric properties of aramid fibrid, mica and nanofibrillated cellulose based
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ORIGINAL RESEARCH
Comparative study on the mechanical and dielectric properties of aramid fibrid, mica and nanofibrillated cellulose based binary composites Zhaoqing Lu . Doudou Ning . Wanbin Dang . Danni Wang . Fengfeng Jia . Jiaoyang Li . Songfeng E
Received: 30 October 2019 / Accepted: 1 July 2020 Ó Springer Nature B.V. 2020
Abstract High-performance insulation materials are widely used in transformers, electric generators and insulated wires of the high-speed trains and airplanes. However, the relatively poor mechanical and dielectric properties of the traditional insulation materials severely limit their application fields, especially in the harsh conditions. In this study, we prepared three binary composite films, including aramid fibrid/mica (AM), aramid fibrid/nanofibrillated cellulose (AN) and mica/nanofibrillated cellulose (MN), through a vacuum-assisted filtration and thoroughly investigated their mechanical and dielectric properties. Due to the
dense nacre-like lamellar structure and strong interfacial bonding strength between mica and nanofibrillated cellulose (NFC), the MN composites exhibit the highest tensile strength of 34.6 MPa and excellent dielectric breakdown intensity of 17.1 kV/mm. The AM composite film has good thermal stability owing to the inherent high temperature resistance of aramid fibrid and mica, but shows the lowest tensile strength and dielectric breakdown intensity. The AN composite film shows the compromise mechanical and dielectric properties.
Z. Lu (&) D. Ning W. Dang D. Wang F. Jia J. Li S. E (&) College of Bioresources Chemical and Materials Engineering, Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science & Technology, Xi’an 710021, China e-mail: [email protected] S. E e-mail: [email protected]
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Cellulose
Graphic abstract
Keywords Aramid fibrid Nanofibrillated cellulose Mica Mechanical properties Insulation properties
Introduction In the past decades, the use of high-speed trains and airplanes has become an increasingly common phenomenon with the rapid economic development. However, there are still many potential safety hazards, such as the failure of electrical equipment and devices at extreme circumstances, which not only affects the normal operation and the lifetime of the electrical equipment but also endangers people’s lives. Electrical insulating materials are key to ensure the normal operation of electrical equipment (Li et al. 2016a, b). Thus, developing high performances insulation materials is urgent to resolve the above-mentioned problems. Traditional insulation materials ranging from plants to minerals to other inorganics often show poor dielectric performances and mechanical properties, which limit their further applications as engineering materials (Lesaint et al. 2019; Psarras et al. 2007; Lu et al. 2008). The polymer-based materials (e.g. epoxy resin, phenolic resin, etc.) have been regarded as the pot
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