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Melo DS, Reis IC, Queiroz JC, Cena CR, Nahime BO, Malmonge JA, Silva MJ. Evaluation of Piezoresistive and Electrical Properties of Conductive Nanocomposite Based on Castor-Oil Polyurethane Filled with MWCNT and Carbon Black. MATERIALS (BASEL, SWITZERLAND) 2023; 16:3223. [PMID: 37110058 PMCID: PMC10143113 DOI: 10.3390/ma16083223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 03/17/2023] [Accepted: 03/20/2023] [Indexed: 06/19/2023]
Abstract
Flexible films of a conductive polymer nanocomposite-based castor oil polyurethane (PUR), filled with different concentrations of carbon black (CB) nanoparticles or multiwall carbon nanotubes (MWCNTs), were obtained by a casting method. The piezoresistive, electrical, and dielectric properties of the PUR/MWCNT and PUR/CB composites were compared. The dc electrical conductivity of both PUR/MWCNT and PUR/CB nanocomposites exhibited strong dependences on the concentration of conducting nanofillers. Their percolation thresholds were 1.56 and 1.5 mass%, respectively. Above the threshold percolation level, the electrical conductivity value increased from 1.65 × 10-12 for the matrix PUR to 2.3 × 10-3 and 1.24 × 10-5 S/m for PUR/MWCNT and PUR/CB samples, respectively. Due to the better CB dispersion in the PUR matrix, the PUR/CB nanocomposite exhibited a lower percolation threshold value, corroborated by scanning electron microscopy images. The real part of the alternating conductivity of the nanocomposites was in accordance with Jonscher's law, indicating that conduction occurred by hopping between states in the conducting nanofillers. The piezoresistive properties were investigated under tensile cycles. The nanocomposites exhibited piezoresistive responses and, thus, could be used as piezoresistive sensors.
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Affiliation(s)
- Diego S. Melo
- Department of Physics and Chemistry, Faculty of Engineering, São Paulo State University (UNESP), Ilha Solteira 15385-000, SP, Brazil
- Department of Energy Engineering, Faculty of Engineering and Science, São Paulo State University (UNESP), Rosana 19274-000, SP, Brazil
| | - Idalci C. Reis
- Science and Technology Goiano, Federal Institute of Education, Rio Verde 75901-970, GO, Brazil
| | - Júlio C. Queiroz
- Science and Technology Goiano, Federal Institute of Education, Rio Verde 75901-970, GO, Brazil
| | - Cicero R. Cena
- Institute of Physics, Federal University of Federal do Mato Grosso do Sul (UFMS), Campo Grande 79070-900, MS, Brazil
| | - Bacus O. Nahime
- Science and Technology Goiano, Federal Institute of Education, Rio Verde 75901-970, GO, Brazil
| | - José A. Malmonge
- Department of Physics and Chemistry, Faculty of Engineering, São Paulo State University (UNESP), Ilha Solteira 15385-000, SP, Brazil
| | - Michael J. Silva
- Department of Energy Engineering, Faculty of Engineering and Science, São Paulo State University (UNESP), Rosana 19274-000, SP, Brazil
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The influence of hydrogen bond and electrostatic interaction on the mechanical properties of the WPU/modified SiO2 nanocomposites. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Wang C, Zhang J, Chen J, Shi J, Zhao Y, He M, Ding L. Bio-polyols based waterborne polyurethane coatings reinforced with chitosan-modified ZnO nanoparticles. Int J Biol Macromol 2022; 208:97-104. [PMID: 35304198 DOI: 10.1016/j.ijbiomac.2022.03.066] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 03/08/2022] [Accepted: 03/11/2022] [Indexed: 11/05/2022]
Abstract
The development of environmentally friendly waterborne polyurethane (WPU) coatings from bio-based polyols has received much attention due to increasing environmental concern and the depletion of petroleum resources. In this study, the WPU coatings derived from castor oil and soy polyol were modified by chain extender [bis(2-hydroxyethyl)amino]-methyl-phosphonic acid dimethyl ester. The effect of chitosan-modified ZnO (CS-ZnO) nanoparticles content on the properties of WPU/CS-ZnO coatings and their films were systematically investigated. The results indicated that WPU/CS-ZnO coatings displayed excellent storage stability and the particle sizes firstly decreased and then increased with CS-ZnO loading. CS-ZnO could improve tensile strength and Young's modulus but reduce the optical transparency of WPU/CS-ZnO films. CS-ZnO has a prominent reinforcement effect on the WPU/CS-ZnO matrix. With the addition of 2 wt% CS-ZnO, the tensile strength and Young's modulus of the WPU/CS-ZnO2 film reached 13.4 and 112.1 MPa, 1.68 and 2.6 times over neat WPU film, respectively. TGA results showed that the thermal stability of WPU/CS-ZnO films improved with increased CS-ZnO content. Furthermore, the WPU/CS-ZnO films' wettability decreased with the introduction of CS-ZnO. This work provides a simple and efficient strategy for preparing environmentally friendly bio-based WPU coatings, which are promising for application in the surface coating industry.
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Affiliation(s)
- Chengshuang Wang
- School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R. China.
| | - Jie Zhang
- School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R. China; You Pei College, Yancheng Institute of Technology, Yancheng 224051, P.R. China
| | - Jiahao Chen
- School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R. China; School of Mechanical Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R. China
| | - Jingwen Shi
- School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R. China
| | - Yanteng Zhao
- Department of Blood Transfusion, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, P.R. China.
| | - Meng He
- School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R. China
| | - Liang Ding
- School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, P.R. China
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