Confined crystallization of polyethylene oxide in nanolayer assemblies

Haopeng Wang, Jong K. Keum, Anne Hiltner, Eric Baer, Benny Freeman, Artur Rozanski, Andrzej Galeski

Research output: Contribution to journalArticleResearchpeer-review

289 Citations (Scopus)

Abstract

The design and fabrication of ultrathin polymer layers are of increasing importance because of the rapid development of nanoscience and nanotechnology. Confined, two-dimensional crystallization of polymers presents challenges and opportunities due to the long-chain, covalently bonded nature of the macromolecule. Using an innovative layer-multiplying coextrusion process to obtain assemblies with thousands of polymer nanolayers, we discovered a morphology that emerges as confined polyethylene oxide (PEO) layers are made progressively thinner. When the thickness is confined to 20 nanometers, the PEO crystallizes as single, high-aspect-ratio lamellae that resemble single crystals. Unexpectedly, the crystallization habit imparts two orders of magnitude reduction in the gas permeability.

Original languageEnglish
Pages (from-to)757-760
Number of pages4
JournalScience
Volume323
Issue number5915
DOIs
Publication statusPublished - 6 Feb 2009
Externally publishedYes

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