Local and Collective Motions in Precise Polyolefins with Alkyl Branches: A Combination of 2H and 13C Solid-State NMR Spectroscopy

被引：40

作者：

Wei, Yuying ^{[1
]}

Graf, Robert ^{[2
]}

Sworen, John C. ^{[1
]}

Cheng, Chi-Yuan ^{[1
]}

Bowers, Clifford R. ^{[1
]}

Wagener, Kenneth B. ^{[1
]}

Spiess, Hans Wolfgang ^{[2
]}

机构：

[1] Univ Florida, Dept Chem, Gainesville, FL 32611 USA

[2] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2009年 / 48卷 / 25期

基金：

美国国家科学基金会;

关键词：

defects; molecular dynamics; NMR spectroscopy; polymer branching; polyolefins; MAGNETIC-RESONANCE; MOLECULAR-DYNAMICS; AMORPHOUS REGIONS; CHAIN DIFFUSION; ROTATOR PHASE; POLYETHYLENE; COPOLYMERS; POLYMERS; CRYSTALLINE; PACKING;

D O I：

10.1002/anie.200900377

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Branching out: The mobility of linear polymers changes upon branching, which has a pronounced effect on processability and drawability. Regularly branched model polyolefins were studied by advanced solid-state NMR spectroscopy, and twist defects around the branches in the crystalline regions are identified. For lower branch content, the twisting motions are decoupled; for higher content, collective motion is found (see picture). © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.

引用

页码：4617 / 4620

页数：4

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