共 25 条
WIM/WISE NMR studies of chain dynamics in solid polymers and blends
被引:22
作者:
Qiu, XH
[1
]
Mirau, PA
[1
]
机构:
[1] Lucent Technol, Bell Labs, Murray Hill, NJ 07974 USA
关键词:
polymers;
solid-state NMR;
dynamics;
2D NMR;
blends;
D O I:
10.1006/jmre.1999.1934
中图分类号:
Q5 [生物化学];
学科分类号:
071010 ;
081704 ;
摘要:
Wideline separation (WISE) NMR with windowless isotropic mixing (WIM) is developed as a method to study the dynamics of polymers and blends. This experiment is designed to measure the dynamics of polymers through the proton lineshapes that are correlated with the carbon chemical shifts in two-dimensional NMR experiments. If the atoms experience large amplitude fluctuations that are fast compared to the dipolar broadening, then the proton lines will be narrowed relative to rigid solids. We have modified the WISE experiment by replacing the cross polarization step with WIM to quench spin diffusion during the cross polarization so that the proton linewidths can be directly related to the chain dynamics. Two-dimensional WIM/WISE has been used to measure the main-chain and side-chain dynamics in poly(n-butyl methacrylate) and blends of polystyrene and poly(vinyl methyl ether). (C) 2000 Academic Press.
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页码:183 / 189
页数:7
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