THERMAL-BEHAVIOR OF HIGHLY STEREOREGULAR SYNDIOTACTIC POLYPROPENE FROM HOMOGENEOUS CATALYSTS

Authors
BALBONTIN G DAINELLI D GALIMBERTI M PAGANETTO G
Citation
G. Balbontin et al., THERMAL-BEHAVIOR OF HIGHLY STEREOREGULAR SYNDIOTACTIC POLYPROPENE FROM HOMOGENEOUS CATALYSTS, Die Makromolekulare Chemie, 193(3), 1992, pp. 693-703
Citations number
34
Journal title
Die Makromolekulare Chemie → ACNP
ISSN journal
0025116X
Volume
193
Issue
3
Year of publication
1992
Pages
693 - 703
Database
ISI
SICI code
0025-116X(1992)193:3<693:TOHSSP>2.0.ZU;2-C
Abstract
Thermal characterization was carried out on highly stereoregular and r egioregular syndiotactic polypropene (sPP) obtained with ropylidene(cy clopentadienyl)(9-fluorenyl)zirconium dichloride and methylaluminoxane . The influence of molecular weight and syndiotacticity degree on the thermodynamic melting point (T(m)-degrees) of sPP were separately inve stigated by examining samples with a fully syndiotactic pentads conten t (rrrr) ranging from ca. 81% to ca. 94% and with an weight-average mo lecular weight (M(w)BAR) ranging from 9,6 . 10(4) to 17,3 . 10(4). Upo n excluding any influence of the molecular weight, the correlation bet ween the rrrr pentads content and the T(m)-degrees of the samples led to the extrapolation of the thermodynamic melting point for a fully sy ndiotactic polypropene.