MEASUREMENT OF NUMBER AVERAGE MOLECULAR WEIGHT OF STYRENE OLIGOMER BY 13C-NMR METHOD

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MEASUREMENT OF NUMBER AVERAGE MOLECULAR WEIGHT OF STYRENE OLIGOMER BY 13C-NMR METHOD

Papers | Updated：2021-06-21

- MEASUREMENT OF NUMBER AVERAGE MOLECULAR WEIGHT OF STYRENE OLIGOMER BY 13C-NMR METHOD
- Vol. 17, Issue 2, Pages: 135-140(1999)
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- Published：20 April 1999
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MEASUREMENT OF NUMBER AVERAGE MOLECULAR WEIGHT OF STYRENE OLIGOMER BY 13C-NMR METHOD[J]. 1999, 17(2): 135-140.
DOI：

MEASUREMENT OF NUMBER AVERAGE MOLECULAR WEIGHT OF STYRENE OLIGOMER BY 13C-NMR METHOD[J]. 1999, 17(2): 135-140. DOI：

摘要

13C-NMR 1H-decoupled spectra of styrene polymers were assigned by comparison with modelcompounds

then used in measurements of number average molecular weights. The higher limit of an exactdetermination of the end group signal is less than a molecular weight of 104. For polymer samples withMn3

the results obtained from 13C-NMR spectra of saturated carbon region are in excellent agreementwith the values determined by 1H-NMR

SEC

and VPO methods

while the results from 13C-NMR spectra of phenyl C-1 carbon region are somewhta higher than the values determined by other methods.

Abstract

13C-NMR 1H-decoupled spectra of styrene polymers were assigned by comparison with modelcompounds

then used in measurements of number average molecular weights. The higher limit of an exactdetermination of the end group signal is less than a molecular weight of 104. For polymer samples withMn3

the results obtained from 13C-NMR spectra of saturated carbon region are in excellent agreementwith the values determined by 1H-NMR

SEC

and VPO methods

while the results from 13C-NMR spectra of phenyl C-1 carbon region are somewhta higher than the values determined by other methods.

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