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
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
收藏
页码:757 / 760
页数:4
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