NDLI: Morphology of thermoset polyimides by positron annihilation spectroscopy

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Morphology of thermoset polyimides by positron annihilation spectroscopy

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ranganathaiah, C. Eftekhari, A. Pater, R. H. Sprinkle, D. R. Baugher, A. H. Singh, J. J.
Copyright Year	1994
Description	Thermoset polyimides have great potential for successfully meeting tough stress and temperature challenges in the advanced aircraft development program. However, studies of structure/property relationships in these materials have not been very successful so far. Positron annihilation spectroscopy has been used to investigate free volumes and associated parameters. It has been noted that the free volume correlates well with the molecular weight, cross-link density and thermal coefficient of expansion of these materials. Currently no other techniques are available for direct measurement of these parameters. Experimental results and their interpretations will be discussed.
File Size	391562
Page Count	18
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19960024146
Archival Resource Key	ark:/13960/t9f52kx2w
Language	English
Publisher Date	1994-11-12
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Spectroscopy Life Durability Aircraft Construction Materials Spectroscopic Analysis Crosslinking Thermosetting Resins Positron Annihilation Density Distribution Molecular Weight Thermal Expansion Polyimides Porosity Dimensional Stability Microstructure 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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