Microstructural characterization of thin polymer films using Langley low energy positron flux generatorWe have developed a highly efficient scheme for generating high fluxes of slow positrons. These positrons have been successfully used to measure lifetimes in thin test films. The lifetime data have been used to develop two structure-property models for the test films. The first model relates the free volume cell size to the molecular weight of the polymer repeat unit. The second model relates the free volume fraction to the dielectric constant of the polymer film.
Document ID
19930037706
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Singh, Jag. J. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
November 1, 1992
Subject Category
Nonmetallic Materials
Meeting Information
Meeting: International Conference on Applications of Accelerators in Research and Industry