NDLI: Preparation and characterization of polyimide nanocomposites

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Preparation and characterization of polyimide nanocomposites

Content Provider	NASA Technical Reports Server (NTRS)
Author	Orwoll, Robert A.
Copyright Year	2002
Description	Many properties of polymeric materials can be enhanced by dispersing small quantities of clay nanocomposites throughout the polymer. Among the enhancements are increases in modulus and resistance to erosion by atomic oxygen and reductions in thermal expansivity, gas permeability, and flammability. To achieve the full extent of enhancement with these polymer-clay nanocomposites, the clay nanoparticles, which have thicknesses of only one-to-several nanometers and lengths and widths of hundreds of nanometers to micrometers, must be exfoliated one from another and then individually dispersed throughout the polymer. This dispersion is achieved only after alkali metal cations (usually Na(+)) that reside on the surfaces of the nanoparticles have been replaced by organocations (typically a quaternary amine cation). This renders the surface of the nanoparticle a more hospitable interface for the organic polymer matrix. Following the cation exchange, the organic clay is either mixed directly into the polymer or is dispersed in monomer which is later polymerized around the nanoparticle.
File Size	288094
Page Count	8
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20020092094
Archival Resource Key	ark:/13960/t08w8cb3r
Language	English
Publisher Date	2002-01-01
Access Restriction	Open
Subject Keyword	Composite Materials Amines Thermogravimetry Polymerization Chemical Reactions Synthesis Chemistry X Ray Diffraction Monomers Clays Organic Chemistry Sodium Nanocomposites Polyimides Cations Metal Ions Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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