Influence of crystal thickness and topological constraints on chain diffusion in linear polyethylene

Yefeng Yao, Robert Graf, Hans Wolfgang Spiess, Sanjay Rastogi

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

13C solid-state exchange NMR is applied to study the influence of morphology on chain diffusion between crystalline and noncrystalline regions in ultrahigh molecular weight linear polyethylene (PE). Lamellar-doubling reduces the exchange rate by a factor of two indicating that the chain diffusion coefficient is largely independent of the lamellar thickness. This is discussed in terms of molecular processes in the crystallites leading to chain diffusion, confirming that the role of defects is minor compared to helical jumps of extended stems. Hindrance of the chain diffusion resulting from chain entanglements was only observed after the chains diffuse over long distances. Moreover, the role of the interphase between the noncrystalline and the crystalline regions on chain diffusion is discussed. © 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish (US)
Pages (from-to)1123-1127
Number of pages5
JournalMacromolecular Rapid Communications
Volume30
Issue number13
DOIs
StatePublished - Jul 1 2009
Externally publishedYes

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