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Precursor Polymer Effect on Polyimide/Silica Hybrid Nanocomposite Films

Title
Precursor Polymer Effect on Polyimide/Silica Hybrid Nanocomposite Films
Authors
Kim, YHa, CSChang, TLee, WKGoh, WKim, HHa, YRee, M
POSTECH Authors
Chang, TRee, M
Date Issued
Aug-2009
Publisher
AMER SCIENTIFIC PUBLISHERS
Abstract
Here we report the influence of the polyimide precursor type on the surface morphology and properties of poly(p-phenylene biphenyltetracarboximide) (BPDA-PDA PI)/silica hybrid composite films. Two types of precursor polymer were employed: poly(p-phenylene biphenyltetracarboxamic acid) (BPDA-PDA PAA) and poly(p-phenylene biphenyltetracarboxamic diethyl ester) (BPDA-PDA PES). These precursor polymers were mixed with tetraethoxysilane in the presence of HCl and H(2)O, which led to the precursor mixture films that contain in-situ generated silica particles via sol-gel process. Then the precursor mixture films were subject to thermal imidization to make polyimide/silica hybrid composite films. Results showed that the PAA precursor has better compatibility with silica particles, which is mainly attributed to the early making of silyl ester bonds (as evidenced by X-ray photoelectron spectroscopy) between carboxylic acid groups in the PAA and hydroxyl groups in silanol molecules. Further evidences were provided by the measurement of surface nanomorphology, crystal nanostructure, thermal/mechanical properties, and optical birefringence.
Keywords
Polyimide; Silica; Hybrid Nanocomposite; Silyl Ester; Dielectric Constant; DIETHYL ESTER) PRECURSORS; THIN-FILMS; COMPOSITE FILMS; SURFACE CHARACTERIZATION; MICROSTRUCTURE; TEMPERATURE; CHEMISTRY
URI
http://oasis.postech.ac.kr/handle/2014.oak/27562
DOI
10.1166/JNN.2009.1081
ISSN
1533-4880
Article Type
Article
Citation
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, vol. 9, no. 8, page. 4633 - 4643, 2009-08
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 REE, MOONHOR
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