Oriented gamma phase in isotactic polypropylene homopolymer

T.B. Erp, van, L. Balzano, G.W.M. Peters

Research output: Contribution to journalArticleAcademicpeer-review

41 Citations (Scopus)
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Abstract

The presence of ¿-phase in isotactic polypropylene is well-known but, up until now, could only be induced by specific processing conditions or material modifications. Typically, for Ziegler–Natta (ZN) iPPs pressures of 2000 bar are required, otherwise, metallocene (M) iPPs and copolymerization using olefin-type counits should be used. Here we show that crystallization under the unique combination of moderate pressure (p = 900 bar) and strong shear flow oriented specimens with high contents of ¿-phase are created in ZN-iPPs. The oriented morphology is qualified as a shish-kebab structure that templates densely branched ¿-lamellae on parent a-lamellae as well as directly to the shish backbone.
Original languageEnglish
Pages (from-to)618-622
JournalACS Macro Letters
Volume1
Issue number5
DOIs
Publication statusPublished - 2012

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