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Cheng X, Wang C, Chen S, Zhang L, Liu Z, Zhang W. Preparation of MoS 2@PDA-Modified Polyimide Films with High Mechanical Performance and Improved Electrical Insulation. Polymers (Basel) 2024; 16:546. [PMID: 38399923 PMCID: PMC10893148 DOI: 10.3390/polym16040546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2024] [Revised: 02/04/2024] [Accepted: 02/05/2024] [Indexed: 02/25/2024] Open
Abstract
Polyimide (PI) has been widely used in cable insulation, thermal insulation, wind power protection, and other fields due to its high chemical stability and excellent electrical insulation and mechanical properties. In this research, a modified PI composite film (MoS2@PDA/PI) was obtained by using polydopamine (PDA)-coated molybdenum disulfide (MoS2) as a filler. The low interlayer friction characteristics and high elastic modulus of MoS2 provide a theoretical basis for enhancing the flexible mechanical properties of the PI matrix. The formation of a cross-linking structure between a large number of active sites on the surface of the PDA and the PI molecular chain can effectively enhance the breakdown field strength of the film. Consequently, the tensile strength of the final sample MoS2@PDA/PI film increased by 44.7% in comparison with pure PI film, and the breakdown voltage strength reached 1.23 times that of the original film. It can be seen that the strategy of utilizing two-dimensional (2D) MoS2@PDA nanosheets filled with PI provides a new modification idea to enhance the mechanical and electrical insulation properties of PI films.
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Affiliation(s)
- Xian Cheng
- School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou 450001, China; (X.C.); (C.W.); (L.Z.); (Z.L.); (W.Z.)
- He’nan Engineering Research Center of Power Transmission and Distribution Equipment and Electrical Insulation, Zhengzhou 450001, China
| | - Chenxi Wang
- School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou 450001, China; (X.C.); (C.W.); (L.Z.); (Z.L.); (W.Z.)
- He’nan Engineering Research Center of Power Transmission and Distribution Equipment and Electrical Insulation, Zhengzhou 450001, China
| | - Shuo Chen
- School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou 450001, China; (X.C.); (C.W.); (L.Z.); (Z.L.); (W.Z.)
- He’nan Engineering Research Center of Power Transmission and Distribution Equipment and Electrical Insulation, Zhengzhou 450001, China
| | - Leyuan Zhang
- School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou 450001, China; (X.C.); (C.W.); (L.Z.); (Z.L.); (W.Z.)
- He’nan Engineering Research Center of Power Transmission and Distribution Equipment and Electrical Insulation, Zhengzhou 450001, China
| | - Zihao Liu
- School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou 450001, China; (X.C.); (C.W.); (L.Z.); (Z.L.); (W.Z.)
- He’nan Engineering Research Center of Power Transmission and Distribution Equipment and Electrical Insulation, Zhengzhou 450001, China
| | - Wenhao Zhang
- School of Electrical and Information Engineering, Zhengzhou University, Zhengzhou 450001, China; (X.C.); (C.W.); (L.Z.); (Z.L.); (W.Z.)
- He’nan Engineering Research Center of Power Transmission and Distribution Equipment and Electrical Insulation, Zhengzhou 450001, China
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Wang P, Zhao J, Zhao Q, Ma X, Du X, Hao X, Tang B, Abudula A, Guan G. Microwave-assisted synthesis of manganese oxide catalysts for total toluene oxidation. J Colloid Interface Sci 2021; 607:100-110. [PMID: 34496313 DOI: 10.1016/j.jcis.2021.08.170] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/13/2021] [Accepted: 08/25/2021] [Indexed: 01/08/2023]
Abstract
Oxygen vacancy on the heterogeneous catalyst is of great importance to the catalysis of volatile organic compound (VOC) oxidation. Herein, microwave radiation with special energy-excitation is successfully utilized for the post-processing of a series of manganese oxides (MnOx) to generate oxygen vacancies. It is found that the MnOx catalyst with 60 min of microwave radiation demonstrates higher activity for toluene oxidation with a T50% of 210 °C and a T100% of 223 °C, which is attributed to the higher concentration of oxygen vacancies derived from the rich phase interface defects resulted from the microwave radiation. Furthermore, the Mn-MW-60 catalyst possesses excellent thermal stability and water vapor tolerance even under 20 vol% H2O atmospheres within 60 h. In situ DRIFTS analysis verifies that both surface and lattice oxygen species simultaneously participate the oxidation process, and all reactions over different environments follows two different pathways. Meanwhile, it is proposed that those oxygen vacancies derived from microwave radiation could facilitate the rate-controlling step of opening the aromatic ring based on the electron back-donation, thereby leading to the increment of catalytic activity.
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Affiliation(s)
- Peifen Wang
- Graduate School of Science and Technology, Hirosaki University, 1-Bunkyocho, Hirosaki 036-8560, Japan; College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Jinggang Zhao
- Graduate School of Science and Technology, Hirosaki University, 1-Bunkyocho, Hirosaki 036-8560, Japan
| | - Qiang Zhao
- Energy Conversion Engineering Laboratory, Institute of Regional Innovation (IRI), Hirosaki University, 2-1-3 Matsubara, Aomori 030-0813, Japan; School of Chemistry and Chemical Engineering, Shanxi Datong University, Datong 037009, PR China
| | - Xuli Ma
- College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Xiao Du
- Department of Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Xiaogang Hao
- Department of Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China
| | - Bing Tang
- School of Environmental Science and Technology, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Abuliti Abudula
- Graduate School of Science and Technology, Hirosaki University, 1-Bunkyocho, Hirosaki 036-8560, Japan
| | - Guoqing Guan
- Graduate School of Science and Technology, Hirosaki University, 1-Bunkyocho, Hirosaki 036-8560, Japan; Energy Conversion Engineering Laboratory, Institute of Regional Innovation (IRI), Hirosaki University, 2-1-3 Matsubara, Aomori 030-0813, Japan.
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