Activation Energy Spectra for Relaxation in Amorphous Materials. I. Volume Relaxation in Polystyrene and Polyvinyl Acetate
作者:
R. M. Kimmel,
D. R. Uhlmann,
期刊:
Journal of Applied Physics
(AIP Available online 1969)
卷期:
Volume 40,
issue 11
页码: 4254-4260
ISSN:0021-8979
年代: 1969
DOI:10.1063/1.1657184
出版商: AIP
数据来源: AIP
摘要:
A modification of the Primak analysis for activation energy distributions is presented and compared with the well‐known analysis for relaxation time distributions. Mathematical and physical interrelationships between the two analyses are discussed. Activation energy spectra are derived from the data of Kovacs for volume relaxation in polystyrene and polyvinyl acetate. The energy spectra are bell shaped and cover the range from 5 to 20 kcal/mole. The concept of a shift factor is introduced to account for changing structure in the glass transition region. The shapes and locations of the spectra are discussed and compared with previous interpretations of volume relaxation data.
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