The phenyl group motion in polystyrene and a model of restricted internal rotation

Wiley - Tập 179 Số 6 - Trang 1521-1529 - 1978
Wolfram Gronski1, N. Murayama1
1Institut für Makromolekulare Chemie der Universität, Stefan‐Meier‐Str. 31, D‐7800 Freiburg

Tóm tắt

AbstractThe 13C NMR relaxation functions are calculated for the case of restricted rotational diffusion of a CH dipole pair about an internal rotational axis. The model is applied to the interpretation of recent 13C experiments of polystyrene in a region where the relaxation of all C atoms of the phenyl ring exhibits the same temperature coefficient. It is concluded that the velocity of the phenyl group motion may be overestimated if complete rotation is assumed. By means of the model of restricted internal rotation one finds D/D0<0,1 for the ratio of internal and mean segmental rotational diffusion constants.

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Tài liệu tham khảo

10.1021/ma60030a020

10.1002/pol.1977.180150509

10.1002/macp.1977.021780519

10.1295/polymj.8.457

F.Lauprětre C.Noël L.Monnerie J. Polym. Sci. Polym. Phys. Ed. to be published

10.1002/macp.1978.021790609

10.1021/ma60035a007

10.1021/ma60055a043

10.1016/0032-3861(76)90235-4

10.1063/1.1732274

10.1063/1.1677747

10.1063/1.1673508

10.1063/1.3060162

10.1063/1.1701790

Frank P., 1961, Die Differentialgleichungen und Integralgleichungen der Mechanik und Physik, 557

10.1103/RevModPhys.17.323

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Wiley

Tập 179 Số 6

1521-1529

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