Confined Crystallization of Polyethylene Oxide in Nanolayer Assemblies

被引：330

作者：

Wang, Haopeng ^{[1
]}

Keum, Jong K. ^{[1
]}

Hiltner, Anne ^{[1
]}

Baer, Eric ^{[1
]}

Freeman, Benny ^{[2
]}

Rozanski, Artur ^{[3
]}

Galeski, Andrzej ^{[3
]}

机构：

[1] Case Western Reserve Univ, Dept Macromol Sci & Engn, Cleveland, OH 44106 USA

[2] Univ Texas Austin, Dept Chem Engn, Austin, TX 78758 USA

[3] Polish Acad Sci, Ctr Mol & Macromol Studies, PL-90363 Lodz, Poland

来源：

SCIENCE | 2009年 / 323卷 / 5915期

关键词：

CRYSTAL ORIENTATIONS; POLYMERIC MATERIALS; DIBLOCK COPOLYMER; BLOCK-COPOLYMER; FILMS; THIN;

D O I：

10.1126/science.1164601

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：757 / 760

页数：4

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