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Local and Collective Motions in Precise Polyolefins with Alkyl Branches: A Combination of 2 H and 13 C Solid‐State NMR Spectroscopy
Author(s) -
Wei Yuying,
Graf Robert,
Sworen John C.,
Cheng ChiYuan,
Bowers Clifford R.,
Wagener Kenneth B.,
Spiess Hans Wolfgang
Publication year - 2009
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200900377
Subject(s) - branching (polymer chemistry) , nuclear magnetic resonance spectroscopy , solid state , spectroscopy , alkyl , solid state nuclear magnetic resonance , crystallography , polymer , twist , materials science , chemistry , nuclear magnetic resonance , physics , stereochemistry , organic chemistry , geometry , mathematics , quantum mechanics
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).