| Numéro |
J. Phys. IV France
Volume 03, Numéro C4, Septembre 1993
4th International Workshop on Positron and Positronium Chemistry
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| Page(s) | C4-275 - C4-278 | |
| DOI | https://doi.org/10.1051/jp4:1993443 | |
4th International Workshop on Positron and Positronium Chemistry
J. Phys. IV France 03 (1993) C4-275-C4-278
DOI: 10.1051/jp4:1993443
Department of Physics, Wuhan University, Wuhan 430072, China
© EDP Sciences 1993
J. Phys. IV France 03 (1993) C4-275-C4-278
DOI: 10.1051/jp4:1993443
Investigation of polymer deformation by positron annihilation
S.J. WANG, C.L. WANG and B. WANGDepartment of Physics, Wuhan University, Wuhan 430072, China
Abstract
Positron lifetimes in polytetrafluroethylene (PTFE) and polyethylene (PE) have been measured as a function of residual deformation [MATH]. For PTFE, the variation of o-Ps intensity shows a three-stage processes : the elastic region ([MATH]), plastic-f low region ([MATH]) and strain-strengthening region ([MATH]). The changes of free-volume hole size and concentration suggest the separation, scission and orientation of segments. For PE, the o-Ps parameters are sensitive to the elastic and plastic regions. Particularly, the hole concentration decreases linearly with [MATH], which indicates the crystallization during deformation.
© EDP Sciences 1993