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 identified. For lower branch content, the twisting motions are decoupled; for higher content, collective motion is found (see picture).
Wei
Yuying
Y
Chemistry Department, University of Florida, Gainesville, FL 32611-7200, USA.
Graf
Robert
R
Sworen
John C
JC
Cheng
Chi-Yuan
CY
Bowers
Clifford R
CR
Wagener
Kenneth B
KB
Spiess
Hans Wolfgang
HW