Browsing by Author "Jiang, LY"

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Bulk and surface properties of layered silicates/fluorinated polyimide nanocomposites
(2002-11-15)
Jiang, LY
;
Wei, KH
;
材料科學與工程學系
;
Department of Materials Science and Engineering
Intercalated layered silicates/fluorinated polyimide nanocomposites with good overall properties are synthesized from organics-modified-montmorillonite and poly(amic acid), as confirmed by x-ray and transmission electron microscopy results. Both the bulk and surface (nanometer-domain) mechanical properties of synthesized silicates/fluorinated polyimide nanocomposites increased substantially as compared to that of pure polyimide. In particular, the Young's modulus and surface hardness of the fluorinated polyimide containing 5 wt % 2NH(2)-mont are 69% and 100% larger than that of pure polyimide, respectively. Additionally, the reduced elastic modulus by nanoindentation of the nanocomposites is 74% larger than that of the pure polyimide. The barrier properties of the nanocomposites, such as thermal expansion and water absorption retardation, are enhanced. (C) 2002 American Institute of Physics.
Layered silicates/fluorinated polyimide nanocomposites for advanced dielectric materials applications
(2002-03-18)
Jiang, LY
;
Leu, CM
;
Wei, KH
;
材料科學與工程學系
;
Department of Materials Science and Engineering
Structured silicates/fluorinated polyimide nanocomposites display excellent water-absorption retardation behavior. This leads to lower leakage-current densities and lower dielectric constants under higher humidity conditions than those of the pristine fluorinated polyimides. Part of the chemical structure of the lavered silicate used in this work is shown in the Figure.
Reduced copper diffusion in layered silicate/fluorinated polyimide (6FDA-ODA) nanocomposites
(2004-05-05)
Jiang, LY
;
Wei, KH
;
材料科學與工程學系
;
Department of Materials Science and Engineering
The copper diffusion barrier properties of layered silicate/fluorinated polyimide nanocomposites were analyzed by transmission electron microscopy (TEM) and secondary ion mass spectrometry (SIMS). It was found that the particles of copper are effectively retarded from penetrating into the polyimide matrix by layered silicates. The diffusion coefficients of layered silicate/polyimide nanocomposites are lower than that of the pure polyimide. (C) 2004 Wiley Periodicals, Inc.