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
收藏
页码：4617 / 4620
页数：4
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