The short-period polymerization method was successfully applied to the synthesis of a novel diblock copolymer, polypropene-block-poly(ethy1ene-co-propene). The polymerization was carried out for ca. 0,l s with a MgC1,-supported Ziegler catalyst. The copolymers obtained showed unimodal curves in gel-
Structure of polypropene and poly(ethylene-co-propene) produced with an alumina-supported CpTiCl3/common alkylaluminium catalyst system
✍ Scribed by Kazuo Soga; Toshiya Uozumi; Masayoshi Saito; Takeshi Shiono
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 412 KB
- Volume
- 195
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
Both propene polymerization and ethylene/propene copolymerization were conducted with an Al~2~O~3~‐supported CpTiCl~3~ (Cp: cyclopentadienyl) catalyst using a common alkylaluminium as cocatalyst. The catalyst system gave atactic polypropene with frequently inverted propene units which are randomly distributed over the polymer chain. The structure of poly(ethylene‐co‐propene) produced with the catalyst system was found to be very different from that obtained with ordinary titanium based catalysts.
📜 SIMILAR VOLUMES
A well-defined diblock copolymer, polypropene-block-poly(ethene-co-propene), was synthesized by modified stopped-flow polymerization with an MgCl 2 -supported Ziegler catalyst. The copolymer shows a unimodal gel permeation chromatography (GPC) elution curve without any material in the low molecular