Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/29445
Title: Synthesis and characterization of polymer nanofoams
Authors: Zhang, YH
Li, Y
Huang, HT 
Ke, SM
Zhao, LH
Chan, HLW 
Keywords: Dielectric constants
Nanofoam
Polyimides
Synthesis
Issue Date: 2007
Publisher: Scientific.Net
Source: Key engineering materials, 2007, v. 334-335 II, p. 821-824 How to cite?
Journal: Key engineering materials 
Abstract: In order to obtain thin film dielectric layers with very low dielectric constants for use in microelectronic devices, polyimide nanofoamed films has been prepared from the polyimide precursors (PMDA-ODA) and poly(ethylene oxide) (PEO) in N,N-dimethylacetamide. The synthesization process included blending polyimide as the major phase with a minor phase of the thermally labile PEO blocks. The foamed films were characterized by a variety of experiments including TG and SEM, and the experimental results indicated that the labile PEO would undergo oxidative thermolysis to release small moleculars from the matrix so as to leave voids into the polyimide matrix. The dielectric properties of the films were studied over broad frequency ranges. The dependences of dielectric constant on the PEO content in the films and frequency were discussed. The films with a proper amount of PEO displayed relatively low dielectric constant compared to the pure polyimide film. Thin film foams with high thermal stability and low dielectric constants can be prepared using the approach.
URI: http://hdl.handle.net/10397/29445
ISSN: 1013-9826
EISSN: 1662-9795
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