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Investigation of Polymer Relaxation after Deformation by Positron Annihilation

Published online by Cambridge University Press:  25 February 2011

Sergey A. Tishin ,
Mihail I. Tsapovestsky ,
Vladimir A. Tishin  and
Vladimir N. Kestelman
Sergey A. Tishin
Affiliation:
Institute of Electronics, Tashkent, Hodgaev 31, USSR 700125
Mihail I. Tsapovestsky
Affiliation:
Institute of High-Molecular Compounds, Leningrad, USSR
Vladimir A. Tishin
Affiliation:
Polytechnical Institute, Tashkent, Navoi 13, USSR 700011
Vladimir N. Kestelman
Affiliation:
Development Products Inc., Collins Avenue 9201, Pennsauken, NJ 08110
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Abstract

The relaxation of polyimid films after the axial tension has been investigated by measuring life-time of positrons and angular correlation of annihilation photons. The nonmonotonic change of mean life-time while relaxing the free film has been found. Two range of changes of positron-sensitive properties can be seen: “rapid” relaxation for 4–5 hours (characterized by reducing life-time of short-lived component) and “slow” relaxation (characterized by reducing the intensity of long-lived component). The results of this investigation have been compared with those of measuring of sample density and dielectric losses. The possible explanations and the- changes of mechanizms of relaxation with the conditions of deformation and “the rest” of polymers are analyzed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 247: Symposium N – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1992 , 883
Copyright
Copyright © Materials Research Society 1992

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References

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