A Method for Characterizing Thermoset Polyimides

Ranganathaiah, C. and Sprinkle, D. R. and Pater, R. H. (1996) A Method for Characterizing Thermoset Polyimides. .

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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 lifetime spectroscopy (PLS) has been used to investigate free volumes and associated parameters in a series of variable, segmental molecular weight samples. The free volume correlates well with the molecular weight Mc, the cross-link density n, and the coefficient of thermal expansion (CTE) of these materials. Currently, no other techniques are available for direct measurement of these parameters, particularly for polymers in solid phase. Experimental results and their interpretations are presented.

Item Type: Article
Subjects: Physical Sciences > Physics
Divisions: PG Campuses > Manasagangotri, Mysore > Physics
Depositing User: Dhruvakumar
Date Deposited: 21 Jun 2013 07:17
Last Modified: 21 Jun 2013 07:17
URI: http://eprints.uni-mysore.ac.in/id/eprint/12829

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