Shim, Wonbo Jeon, Seung-Yeol Yu, Woong-Ryeol 2024-01-19T12:03:12Z 2024-01-19T12:03:12Z 2022-04-05 2022-05 0272-8397 https://pubs.kist.re.kr/handle/201004/115245 The resistance change of carbon nanotube (CNT)/polymer composites during stress relaxation depended strongly on the CNT concentration and aspect ratio. At low concentration, the resistance of the composites increased regardless of aspect ratio of CNTs as relaxation progressed, while the relaxation modulus accordingly decreased. This trend changed with CNT concentration. To investigate the mechanism, a new resistor model was developed based on the number of contacts between CNTs within tunneling distance of each other. Simulations revealed that when the number of contacts between CNTs is insufficient to form multiple conducting pathways, the increased tunneling resistance has more influence on the overall resistance, leading to the increased resistance. Finally, the proposed resistor model was used to qualitatively explain the resistance change of the composites at different CNT concentration and aspect ratios during tensile test, demonstrating its validity. English John Wiley & Sons Inc. Modeling of the piezoresistive behavior of carbon nanotube/polymer composites during stress relaxation Article 10.1002/pc.26565 1 Polymer Composites, v.43, no.5, pp.2672 - 2682 Polymer Composites 43 5 2672 2682 N scie scopus 000761170500001 2-s2.0-85125254316 Materials Science, Composites Polymer Science Materials Science Polymer Science Article POLYMER NANOCOMPOSITES RESIDUAL-STRESS RESISTANCE NANOTUBES carbon nanotubes electrical properties nanocomposites piezoresistive behavior stress relaxation