CARBON-13 NMR STUDY OF MOLECULAR MOTION OF 1, 2-POLYBUTADIENES IN SOLUTION Ⅰ. STRUCTURE DEPENDENCE 
OF MOLECULAR MOTIOM

NI Shaoru; SHEN Lianfang; YU Fusheng; QIAN Baogong

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CARBON-13 NMR STUDY OF MOLECULAR MOTION OF 1, 2-POLYBUTADIENES IN SOLUTION Ⅰ. STRUCTURE DEPENDENCE OF MOLECULAR MOTIOM

Papers | Updated：2021-06-21

- CARBON-13 NMR STUDY OF MOLECULAR MOTION OF 1, 2-POLYBUTADIENES IN SOLUTION Ⅰ. STRUCTURE DEPENDENCE OF MOLECULAR MOTIOM
- Vol. 4, Issue 1, Pages: 8-16(1986)
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- Published：20 March 1986
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NI Shaoru, SHEN Lianfang, YU Fusheng, et al. CARBON-13 NMR STUDY OF MOLECULAR MOTION OF 1, 2-POLYBUTADIENES IN SOLUTION Ⅰ. STRUCTURE DEPENDENCE OF MOLECULAR MOTIOM[J]. 1986, 4(1): 8-16.
DOI：

NI Shaoru, SHEN Lianfang, YU Fusheng, et al. CARBON-13 NMR STUDY OF MOLECULAR MOTION OF 1, 2-POLYBUTADIENES IN SOLUTION Ⅰ. STRUCTURE DEPENDENCE OF MOLECULAR MOTIOM[J]. 1986, 4(1): 8-16. DOI：

摘要

Proton decoupled

partially relaxed

Fourier-transform 50.3 MHz carbon-13 NMR in natural abundance was used to determine spin-lattice times (T1) and nuclear Overhauser enhancement fac-tors (NOE) of individual carbon of a serics of 1

2-polybutadienes with different structures in solutionin CDCl2. The structure dependence of molecular metion and the internal motion of vinyl group in 1

2-polybutadiene have been studied by nT1 and NOE values. The nT1 values of the carbons in cis-1

4-units are the highest and those of the carbons in 1

2-units are the lowest in three types of units in 1

2-polybutadiene.The nT1 values of carbons in the same unit become greater when the adjacent 1

2-units are replaced by 1

4-units

and nT1 values of the carbons in all units decrease sharply with the increase of content of 1

2-units in the polymers.The fact that nT1 values of —CH=are larger than those of =CH2 in vinyl group implies that there are complex internal motions of vinyl group.It is shown by calculation that the dominant factor causing the difference in nT1 of—CH=and=CH2 in vinyl group is a swing of vinyl group in a plane perpendicular to the chain backbone.

Abstract

Proton decoupled

partially relaxed

Fourier-transform 50.3 MHz carbon-13 NMR in natural abundance was used to determine spin-lattice times (T1) and nuclear Overhauser enhancement fac-tors (NOE) of individual carbon of a serics of 1

2-polybutadienes with different structures in solutionin CDCl2. The structure dependence of molecular metion and the internal motion of vinyl group in 1

2-polybutadiene have been studied by nT1 and NOE values. The nT1 values of the carbons in cis-1

4-units are the highest and those of the carbons in 1

2-units are the lowest in three types of units in 1

2-polybutadiene.The nT1 values of carbons in the same unit become greater when the adjacent 1

2-units are replaced by 1

4-units

and nT1 values of the carbons in all units decrease sharply with the increase of content of 1

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