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Synthesis of polypropene-block-poly(ethylene-co-propene) by short-period polymerization with MgCl2-supported Ziegler catalyst

✍ Scribed by Hideharu Mori; Mikio Yamahiro; Kunihiko Tashino; Kouki Ohnishi; Koh-hei Nitta; Minoru Terano

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
251 KB
Volume
16
Category
Article
ISSN
1022-1336

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✦ Synopsis

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-permeation chromatography without any peak in the low-molecular-weight region. After extraction with heptane, the fraction of poly(ethy1ene-co-propene) remained unchanged in the copolymer but disappeared in a commercial so-called block-type copolymer. All the results suggest the formation of polypropene-block-poly(ethy1ene-co-propene), in which poly(ethy1ene-co-propene) is chemically linked with polypropene.

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Synthesis and basic characteristics of polypropene-block-poly(ethene-co-propene) by modified stopped-flow polymerization with an MgCl2-supported Ziegler catalyst
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## Abstract The PdCl~2~‐induced chain transfer reaction by hydrogen in the initial stage of propene polymerization with a MgCl~2~‐supported Ziegler catalyst was studied by means of the stopped‐flow polymerization technique. A chain transfer reaction was found to occur even in the initial stage of t