| Controllable low dielectric porous polyimide films templated by silica microspheres: Microstructure, formation mechanism, and properties | |
| Department | 先进润滑与防护材料研究发展中心 |
Wang QH(王齐华) ; Wang C(王超); Wang TM(王廷梅); Wang C(王超); Wang TM(王廷梅)
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| The second department | 固体润滑国家重点实验室 |
| 2013 | |
| Source Publication | Journal of Colloid and Interface Science
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| ISSN | 0021-9797 |
| Volume | 389Pages:99-105 |
| Abstract | In the paper, controllable low dielectric macroporous polyimide (PI) films were prepared using silica microspheres as template, based on the solvent-evaporation-assisted in situ self-assembly of polyamic acid (PAA, precursor of PI) and silica microspheres in N,N-Dimethylformamide (DMF) solution. The interior microstructure of the macroporous PI films and its relationship with mechanical and dielectric properties were investigated. It was found that the macroporous PI films had triple-layer porous structures: ordered porous surface, dense layer in the middle, and interconnected porous structure at the bottom. The thickness of the dense layer in the middle changed with increasing weight content of silica. When SiO2 wt% was above 40%, the dense layer nearly disappeared. The interconnected porous structure at the bottom was quite homogenous, and the pore size could be controlled by the diameter of silica microspheres. Based on the experimental results, possible formation mechanism of the macroporous PI films was addressed. The mechanical properties of the macroporous PI films were degraded due to the introduction of air void. It was found that the degradation of mechanical properties of macroporous PI films with porosity of 37% is more obvious than that of PI films with porosity below 31%, which could be attributed to the triple-layer microstructure of the films. The air void introduction could effectively reduce the dielectric constant from 4.11 of PI dense films to 2.57 of porous PI films with porosity of 37%. The dielectric constant was only closely related to porosity and had no obvious connection with pore size. |
| Keyword | Dielectric Constant Macroporous Polyimide Films Template Triple-layer Structure |
| Subject Area | 材料科学与物理化学 |
| DOI | 10.1016/j.jcis.2012.08.036 |
| Funding Organization | the National Science Foundation for Distinguished Young Scholars of China (Grant No. 51025517);the National Defense Basic Scientific Research Project (A1320110011) |
| Indexed By | SCI |
| If | 3.552 |
| Language | 英语 |
| Funding Project | 聚合物自润滑复合材料组 |
| compositor | 第一作者单位 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/4374 |
| Collection | 中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心 固体润滑国家重点实验室（LSL） |
| Corresponding Author | Wang C(王超); Wang TM(王廷梅) |
| Affiliation | Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China |
| Recommended Citation GB/T 7714 | Wang QH,Wang C,Wang TM,et al. Controllable low dielectric porous polyimide films templated by silica microspheres: Microstructure, formation mechanism, and properties[J]. Journal of Colloid and Interface Science,2013,389:99-105. |
| APA | Wang QH,Wang C,Wang TM,王超,&王廷梅.(2013).Controllable low dielectric porous polyimide films templated by silica microspheres: Microstructure, formation mechanism, and properties.Journal of Colloid and Interface Science,389,99-105. |
| MLA | Wang QH,et al."Controllable low dielectric porous polyimide films templated by silica microspheres: Microstructure, formation mechanism, and properties".Journal of Colloid and Interface Science 389(2013):99-105. |
| Files in This Item: | ||||||
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| Wang-2013-Controllab（1867KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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