PHONON-DISPERSION IN HELICAL S(2 1)2 SYNDIOTACTIC POLYSTYRENE/

Authors
RASTOGI S GUPTA VD
Citation
S. Rastogi et Vd. Gupta, PHONON-DISPERSION IN HELICAL S(2 1)2 SYNDIOTACTIC POLYSTYRENE/, Journal of macromolecular science. Physics, B34(1-2), 1995, pp. 1-13
Citations number
25
Categorie Soggetti
Polymer Sciences
Journal title
Journal of macromolecular science. Physics → ACNP
ISSN journal
00222348
Volume
B34
Issue
1-2
Year of publication
1995
Pages
1 - 13
Database
ISI
SICI code
0022-2348(1995)B34:1-2<1:PIHS1S>2.0.ZU;2-J
Abstract
Phonon dispersions for helical s(2/1)2 syndiotactic polystyrene (sPS) are obtained and compared with the dispersions for its planar form. Op tically active frequencies corresponding to the zone center and zone b oundary are identified and discussed. In general the dispersion in the helical form is less as compared to the planar form. Some of the dist inguishing features such as crossing over, repulsion of modes, and pro file of the acoustic modes are discussed and possible explanations are given.