Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Improvement in productivity and molecular weight of polypropene-block-poly(ethene-co-propene) obtained by a modified stopped-flow method using various external electron donors
Autore:
Mori, H; Yamahiro, M; Terano, M; Takahashi, M; Matsukawa, T;
Indirizzi:
Chisso Petrochem Corp, Polymer Res Ctr, Yokohama Branch, Yokohama, Kanagawa 2360043, Japan Chisso Petrochem Corp Yokohama Kanagawa Japan 2360043 gawa 2360043, Japan
Titolo Testata:
ANGEWANDTE MAKROMOLEKULARE CHEMIE
, volume: 273, anno: 1999,
pagine: 40 - 46
SICI:
0003-3146(199912)273:<40:IIPAMW>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
ZIEGLER-NATTA CATALYSTS; ACTIVE-SITES PRECURSORS; PROPENE POLYMERIZATION; LEWIS BASE; OLEFIN POLYMERIZATION; ALKOXYSILANE DONORS; SUPPORTED CATALYSTS; SILANE DONORS; STEREOSPECIFICITY; ACTIVATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
H. Mori et al., "Improvement in productivity and molecular weight of polypropene-block-poly(ethene-co-propene) obtained by a modified stopped-flow method using various external electron donors", ANGEW MAKRO, 273, 1999, pp. 40-46

Abstract

The efficiencies of various types of external electron donors to improve the productivity and molecular weight of the block copolymer, polypropene-block-poly(ethene-co-propene) obtained by a modified stopped-flow method wereinvestigated, directed toward commercial production. Five alkoxysilanes having different structures, and a piperidine compound were employed as external donors. In all cases, an increase in the activity and weight-average molecular weight was observed on addition of the external donor at a Si/Ti mole ratio of ca. 1.0. Diisopropyldimethoxysilane was considered to be the most suitable donor for the synthesis of the block copolymer, due to its higher initial activity and properties, giving a polymer having higher molecular weight. An improvement in the molecular weight with considerable catalystdeactivation was apparently observed by increasing the Si/Ti mole ratio and decreasing the triethylaluminum (TEA) concentration. The results in this paper are an indication that a suitable choice of the kinds of external donors, Si/Ti mole ratio, and TEA concentration an needed to obtain block copolymers with desirable performance.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 11:17:06