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Structural Evolution and Mechanical Properties of PMR-15/Layered Silicate NanocompositesIn the first year of this research, we successfully synthesized and characterized Polymer/ Layered Silicate nanocomposite using the polyimide PMR-15 as the polymer and several layered silicate nanoparticles. We have scaled up the process to allow fabrication of monoliths using these nanocomposites. The morphology of these systems was found to evolve during processing to an exfoliated structure for one system and intercalated for the rest. Correlation with Transmission Electron Microscopy studies is underway. Dynamic mechanical analysis (DMA) results showed a significant increase in the thermomechanical properties (E' and E'') of 2.5 wt.% clay loaded nanocomposites in comparison to the neat polyimide. Increasing the clay loading to 5 wt.% decreased these properties. Higher glass transition temperatures were observed for 2.5 wt.% nanocomposites compared to the neat polyimide. A lower coefficient of thermal expansion was observed only for the PGV/PMR-15 nanocomposite. An improvement in the flexural properties (modulus, strength and elongation) was observed for the 2.5 wt.% nanocomposite but not for the 5 wt.% nanocomposites. The improved barrier properties polymer/ silicate nanocomposites suggest that moisture uptake should be decreased for PMR-15 nanocomposites. The results of some recent experiments to examine delineate the ability of the silicate nanoparticles in improving the hydrolytic degradation of PMR-15 will be discussed.
Document ID
20030063094
Acquisition Source
Glenn Research Center
Document Type
Abstract
Authors
Campbell, Sandi
(NASA Glenn Research Center Cleveland, OH, United States)
Dean, Derrick
(Tuskegee Inst. AL, United States)
Abdalla, Mohamed
(Tuskegee Inst. AL, United States)
Green, Keith
(Tuskegee Inst. AL, United States)
Small, Sharee
(Tuskegee Inst. AL, United States)
Date Acquired
August 21, 2013
Publication Date
February 1, 2003
Publication Information
Publication: HBCUs/OMUs Research Conference Agenda and Abstracts
Subject Category
Nonmetallic Materials
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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