SIDE-CHAIN EFFECTS ON THE THERMAL-PROPERTIES OF ETHYLENE COPOLYMERS PREPARED OVER METALLOCENE CATALYST

Authors
CHU KJ PARK TH
Citation
Kj. Chu et Th. Park, SIDE-CHAIN EFFECTS ON THE THERMAL-PROPERTIES OF ETHYLENE COPOLYMERS PREPARED OVER METALLOCENE CATALYST, Materials letters, 31(1-2), 1997, pp. 11-14
Citations number
8
Categorie Soggetti
Material Science","Physics, Applied
Journal title
Materials letters → ACNP
ISSN journal
0167577X
Volume
31
Issue
1-2
Year of publication
1997
Pages
11 - 14
Database
ISI
SICI code
0167-577X(1997)31:1-2<11:SEOTTO>2.0.ZU;2-3
Abstract
From a study of thylene copolymerization with different comonomers (pr opylene, 1-butene, 1-hexene, 1-octene) over metallocene catalyst (Cp2Z rCl2), the catalytic activity shows an enhancement of the polymerizati on rate in the presence of comonomers. The thermal properties of the p roduced copolymers depend on the kind of comonomer and the composition of comonomer in the produced copolymers prepared from copolymerizatio n. Especially, the ethylene copolymers having high comonomer compositi on from the metallocene catalyst showed that the melting point T-m1 is higher than T-m2 for the polyethylenes from Ziegler-Natta catalyst bu t not for the ethylene copolymers having low comonomer composition. Fr om differential scanning calorimetry (DSC) analysis, the change of mel ting temperature with scanning time may be dependent upon the type and composition of comonomer used in copolymerization.