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Microstructural Characterization of Polymers by Positron Lifetime SpectroscopyPositrons provide a versatile probe for monitoring microstructural features of molecular solids. In this paper, we report on positron lifetime measurements in two different types of polymers. The first group comprises polyacrylates processed on earth and in space. The second group includes fully-compatible and totally-incompatible Semi-Interpenetrating polymer networks of thermosetting and thermoplastic polyimides. On the basis of lifetime measurements, it is concluded that free volumes are a direct reflection of physical/electromagnetic properties of the host polymers.
Document ID
19960054347
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Singh, Jag J. (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1996
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.15:110469
NASA-TM-110469
Report Number: NAS 1.15:110469
Report Number: NASA-TM-110469
Meeting Information
Meeting: Applications of Accelerators in Research and Industry
Location: Denton, TX
Country: United States
Start Date: November 6, 1996
End Date: November 9, 1996
Accession Number
96N36521
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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