EFFECT OF PHENYLTRIETHOXYSILANE AS EXTERNAL DONOR ON THE MICROSTRUCTURE OF ETHYLENE-PROPYLENE COPOLYMERS

Authors
ECHEVSKAYA LG MOHANDAS TP BUKATOV GD ZAKHAROV VA SEHRA JC SIVARAM S
Citation
Lg. Echevskaya et al., EFFECT OF PHENYLTRIETHOXYSILANE AS EXTERNAL DONOR ON THE MICROSTRUCTURE OF ETHYLENE-PROPYLENE COPOLYMERS, Polymer bulletin, 31(1), 1993, pp. 69-74
Citations number
11
Categorie Soggetti
Polymer Sciences
Journal title
Polymer bulletin → ACNP
ISSN journal
01700839
Volume
31
Issue
1
Year of publication
1993
Pages
69 - 74
Database
ISI
SICI code
0170-0839(1993)31:1<69:EOPAED>2.0.ZU;2-B
Abstract
The effect of an external electron donor, namely, phenyltriethoxysilan e (PES) on the compositional heterogeneity and the microstructure of e thylene-propylene copolymers prepared using a titanium-magnesium catal yst has been investigated. Addition of PES causes an increase in the a verage sequence length of ethylene and propylene. The products of reac tivity ratios of ethylene and propylene indicate that the copolymer is blocky in nature. The external donor produces a propylene sequence in the copolymer which is richer in mmmm pentads.