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

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

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 ide...

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Veröffentlicht in:Angewandte Chemie (International ed.) 2009, Vol.48 (25), p.4617-4620
Hauptverfasser: Wei, Yuying, Graf, Robert, Sworen, John C, Cheng, Chi-Yuan, Bowers, Clifford R, Wagener, Kenneth B, Spiess, Hans Wolfgang
Format: Artikel
Sprache:eng
Schlagworte:
defects
molecular dynamics
NMR spectroscopy
polymer branching
polyolefins
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Beschreibung
Zusammenfassung: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).
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.200900377