Journal
CARBOHYDRATE POLYMERS
Volume 245, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116610
Keywords
Paper-based composite; Nano fibrillated cellulose; Aramid fibrid; Dielectric property; Nano-SiO2
Categories
Funding
- National Key Research and Development Plan [2017YBF0308302]
- National Natural Science Foundation of China [51803110]
- Shaanxi Natural Science Basic Research Program [2019JQ-010]
- Opening Foundation of New Style Think Tank of Shaanxi Universities (Research Center for Auxiliary Chemistry and New Materials Development, Shaanxi University of Science and Technology) [ACNM-202004]
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Flexible paper-based nanocomposites dielectrics are of crucial importance in electrical insulation and advanced electrical power systems. In this work, a novel nanofibrillated cellulose/aramid fibrid (NFC/AF) composite was fabricated by vacuum-assisted filtration process. In order to improve the dielectric property of the composites, carboxylated nano-SiO2 was chemically coated onto aramid fibrid via molecular self-assembly with the aid of phosphoric acid (PA) pretreatment and subsequent polyethyleneimine (PEI) functionalization. It was found that composites prepared by NFC and (PEI/SiO2)-modified AF (after crosslinking) ((PEI/SiO2)-AF) showed dense structure, which was mainly due to enhanced interfacial interaction between AF and NFC. Consequently, NFC/ (PEI/SiO2)-AF paper-based composites showed better tensile toughness (similar to 6 % elongation at break) and me-chanical strength (similar to 36.28 MPa), in comparison with NFC/AF. More importantly, the electrical insulation per-formance and thermal stability of the composites were significantly improved. Accordingly, this work provides a facile approach to fabricate high-performance dielectric composites especially for high-temperature electrical insulation applications.
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