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Nanocomposite Films derived from Alkoxysilane Terminated Amide Acid Oligomers and Carbon Nanotubes

Published online by Cambridge University Press:  01 February 2011

Joseph G. Smith Jr ,
John W. Connell ,
Peter Lillehei ,
Kent A. Watson  and
Craig M. Thompson
Joseph G. Smith Jr
Affiliation:
National Aeronautics and Space Administration, Langley Research Center Hampton, VA 23681-2199
John W. Connell
Affiliation:
National Aeronautics and Space Administration, Langley Research Center Hampton, VA 23681-2199
Peter Lillehei
Affiliation:
National Aeronautics and Space Administration, Langley Research Center Hampton, VA 23681-2199
Kent A. Watson
Affiliation:
ICASE
Craig M. Thompson
Affiliation:
National Resarch Council Research Associate
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Abstract

Low color, space environmentally stable, polymeric materials with sufficient electrical conductivity for static charge dissipation are of interest for potential applications on Gossamer spacecraft. One method of imparting electrical conductivity while maintaining optical clarity is through the use of single wall carbon nanotubes (SWNTs). Both theory and research on SWNTs have shown them to be conductive. However, SWNTs are very difficult to uniformly disperse in a polymer. The approach described herein was to use oligomers endcapped with functional groups that could condense with functionalities present on purified, laser ablated SWNTs. Low color, radiation resistant amide acid oligomers endcapped with trialkoxysilane groups were combined with SWNTs. Since the SWNTs were purified by an oxidative process (nitric/sulfuric acid treatment), they have functionalities such as hydroxyl and carboxylic acid groups that can condense with the terminal alkoxysilane groups. After mixing at room temperature, the mixtures were used to cast films that were subsequently stage-cured up to 300°C for 1 hour in air. During this thermal treatment, imidization and condensation occurred. The chemistry, physical, and mechanical properties of the resulting nancomposite films will be presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 733: Symposium T – Polymer Nanocomposites , 2002 , T3.5
Copyright
Copyright © Materials Research Society 2002

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