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Ionizing Radiation Effects on Interfaces in Carbon Nanotube-Polymer Composites

Published online by Cambridge University Press:  17 March 2011

Julie P. Harmon ,
Patricia Anne O. Muisener ,
LaNetra Clayton ,
John D'Angelo ,
Arun K. Sikder ,
Ashok Kumar ,
Meyya Meyyappan  and
Alan M. Cassell
Julie P. Harmon
Affiliation:
Department of Chemistry
Patricia Anne O. Muisener
Affiliation:
Department of Chemistry
LaNetra Clayton
Affiliation:
Department of Chemistry
John D'Angelo
Affiliation:
Department of Chemistry
Arun K. Sikder
Affiliation:
Center for Microelectronics Research University of South Florida, 4202 E Fowler Avenue, Tampa, FL 33620-5250
Ashok Kumar
Affiliation:
Center for Microelectronics Research University of South Florida, 4202 E Fowler Avenue, Tampa, FL 33620-5250
Meyya Meyyappan
Affiliation:
NASA Ames Research Center, Moffett Field, CA 94035
Alan M. Cassell
Affiliation:
NASA Ames Research Center, Moffett Field, CA 94035
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Abstract

The purpose of this research was to probe nanotube-polymer composites for evidences of radiation induced chemistry at the interface of the host polymer and the nanotube structures. Single wall carbon nanotube (SWNT) / poly (methyl methacrylate) (PMMA) composites were fabricated and exposed to gamma radiation with a Co60 source at a dose rate of 1.28 X 106 rad/hour in an air environment for a total dose of 5.9 Mrads. Neat nanotube paper and neat PMMA were also exposed. Spun coat films of SWNT/PMMA were exposed to gamma radiation with a Ce157at a dose rate of 4.46 x 103 rad/hr for a total dose of 3.86 Mrads. Both irradiated and non-irradiated samples were compared. Glass transition temperatures were characterized by differential scanning calorimetry. Dynamic mechanical analysis and dielectric analysis evidenced changes in relaxations induced by irradiation. Irradiated composites exhibited radiation induced chemistry distinct from degradation effects noted in the pure polymer. Scanning electron microscopy provided images of the SWNTs and SWNT/PMMA interface before and after irradiation. This investigation imparts insight into the nature of radiation induced events in nanotubes and nanocomposites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 697: Symposium P – Surface Engineering 2001--Fundamentals and Applications , January 2001 , P9.7
Copyright
Copyright © Materials Research Society 2002

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