CORRELATION BETWEEN ELECTRON-DENSITY AND MOMENTUM IN FREE-VOLUME HOLES OF SOME SEMICRYSTALLINE POLYMERS

Authors
RAMANI R RAMACHANDRA P RAMGOPAL G RAVICHANDRAN TSG RANGANATHAIAH C GOPAL S
Citation
R. Ramani et al., CORRELATION BETWEEN ELECTRON-DENSITY AND MOMENTUM IN FREE-VOLUME HOLES OF SOME SEMICRYSTALLINE POLYMERS, Physica status solidi. a, Applied research, 158(1), 1996, pp. 3-8
Citations number
12
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica status solidi. a, Applied research → ACNP
ISSN journal
00318965
Volume
158
Issue
1
Year of publication
1996
Pages
3 - 8
Database
ISI
SICI code
0031-8965(1996)158:1<3:CBEAMI>2.0.ZU;2-M
Abstract
Positron annihilation lifetime (PAL) and Doppler broadening (DB) measu rements were carried out in four semicrystalline polymer samples, viz. , polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS), polytetra fluoroethylene (PTFE), and Nylon 6; 6 (PA). A correlation between the S and W-parameters which reflect the electron momentum, and the ortho- positronium (o-Ps) lifetime reflecting the electron densities in free volume sites is observed. Interestingly, the present results support t he known intuition that o-Ps has a higher momentum component compared to p-Ps and free annihilations but different from that observed by Dav ies and Pethrick.