中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 力学研究所
  3. 中国科学院力学研究所
  4. 宽域飞行工程科学与应用中心
Enhanced mechanical and thermal performance of Crosslinked Polyimides: Insights from molecular dynamics simulations and experimental characterization for motor insulation applications

文献类型：期刊论文

作者Chen YW(陈钰玮)1; Liu YD(刘屹东)2,3; Min, Yonggang1,4
刊名POLYMER TESTING
出版日期2025-02-01
卷号143
关键词Polyimide Cross-link Molecular dynamics Heat-resistance Motor insulation
ISSN号0142-9418
DOI10.1016/j.polymertesting.2025.108705
英文摘要This study evaluated the impact of various cross-linking methodologies on the properties of polyimide (PI) to gain insights into how molecular structure influences the thermal stability and mechanical characteristics of PI, thereby fulfilling the performance criteria for motor insulation applications. The investigation utilized crosslinking agents such as TAB, 4-PEPA, and NA. The relationships among different cross-linkers, molecular structures, and properties were explored using molecular dynamics simulations and further refined through experimental characterization. The results indicate that a high degree of crosslinking can significantly counteract the negative influence of Si-O-Si structures and alkyl chains on PI's thermal stability, while preserving excellent mechanical properties. The introduction of 4-PEPA and NA to form crosslinked networks significantly improved the glass transition temperature (Tg), tensile strength, and modulus of PI. Additionally, BPDA and ODA effectively compensated for the disordered crosslinking caused by NA, further enhancing the mechanical properties of NPI. Notably, the Tg of PIs with phenylacetylidene crosslinking increased significantly to 408 degrees C, while maintaining a tensile strength of 122 MPa, and the swelling rate in high-temperature oil solutions was reduced to 28 %. Additionally, this study introduced a novel concept of polymerization propensity(POP) and, uniquely, integrated the selection of cross-linking processes with the capacity of different monomers to bind long-chain molecules to analyze the effects of crosslinking on the polymerization process and final performances. These findings provide valuable insights into optimizing the properties of PI materials, with both theoretical and practical implications for materials science.
分类号一类
WOS研究方向Materials Science, Characterization & Testing ; Polymer Science ; Materials Science
语种英语
WOS记录号WOS:001409876100001
资助机构This research was supported by High-level Innovation Research Institute Program of Guangdong Province (2020B0909010003/GARA2023001000) , National Natural Science Foundation of China (U20A20340) , Foshan Introducing Innovative and Entrepreneurial Teams (1920001000108) and Guangzhou Hongmian Project (HMJH-2020-0012) .
其他责任者刘屹东，Min, Yonggang
源URL[http://dspace.imech.ac.cn/handle/311007/101445]  
专题宽域飞行工程科学与应用中心
作者单位1.Guangdong University of Technology;
2.Chinese Academy of Sciences Inst Mech;
3.Guangdong Aerosp Res Acad Nan Sha;
4.Guangzhou Liangyue Mat Technol Co Ltd
推荐引用方式
GB/T 7714		 Chen YW,Liu YD,Min, Yonggang. Enhanced mechanical and thermal performance of Crosslinked Polyimides: Insights from molecular dynamics simulations and experimental characterization for motor insulation applications[J]. POLYMER TESTING,2025,143.
APA 陈钰玮,刘屹东,&Min, Yonggang.(2025).Enhanced mechanical and thermal performance of Crosslinked Polyimides: Insights from molecular dynamics simulations and experimental characterization for motor insulation applications.POLYMER TESTING,143.
MLA 陈钰玮,et al."Enhanced mechanical and thermal performance of Crosslinked Polyimides: Insights from molecular dynamics simulations and experimental characterization for motor insulation applications".POLYMER TESTING 143(2025).

入库方式： OAI收割

来源：力学研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。