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题名: Synthesis and characterization of flexible and high-temperature resistant polyimide aerogel with ultra-low dielectric constant
作者: Zhang, X. M.1; Liu, J. G.2; Yang, S. Y.2
关键词: thermal properties ; polyimide aerogel ; supercritical drying ; dielectric properties
刊名: EXPRESS POLYMER LETTERS
发表日期: 2016-10-01
卷: 10, 期:10, 页:789-798
收录类别: SCI
英文摘要: A polyimide (PI) aerogel with excellent combined thermal and dielectric properties was successfully prepared by the polycondensation of 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA), 5-amino-2-(4-aminophenyl)benzoxazole (APBO) and octa(amino-phenyl) silsesquioxane (OAPS) crosslinker, followed by a supercritical carbon dioxide (scCO(2)) drying treatment. The developed PI aerogel exhibited an ultra-low dielectric constant (k) of 1.15 at a frequency of 2.75 GHz, a volume resistivity of 5.45.10(14) Omega.cm, and a dielectric strength of 132 kV/cm. The flexible PI aerogel exhibited an open-pore microstructure consisting of three-dimensional network with tangled nanofibers morphology with a porosity of 85.6% (volume ratio), an average pore diameter of 19.2 nm, and a Brunauer-Emmet-Teller (BET) surface area of 428.6 m(2)/g. In addition, the PI aerogel showed excellent thermal stability with a glass transition temperature (T-g) of 358.3 degrees C, a 5% weight loss temperature over 500 degrees C, and a residual weight ratio of 66.7% at 750 degrees C in nitrogen.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35342
Appears in Collections:高技术材料实验室_期刊论文

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作者单位: 1.Beijing Jiaotong Univ, Sch Elect Engn, Beijing 100044, Peoples R China
2.Chinese Acad Sci, Inst Chem, Lab Adv Polymer Mat, Beijing 100190, Peoples R China
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