测定高弹体中横向 1H NMR 弛豫的残余偶极相互作用。

Determination of residual dipolar interaction from transverse 1H NMR relaxation in elastomers.

机构信息

Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.

出版信息

Solid State Nucl Magn Reson. 2009 Dec;36(4):167-71. doi: 10.1016/j.ssnmr.2009.11.001. Epub 2009 Nov 11.

DOI:10.1016/j.ssnmr.2009.11.001

PMID:19939639

Abstract

The formula expressing the proton transverse magnetization decay for elastomers is reconsidered. It is improved by incorporating the relaxation contribution. The spin-spin relaxation times T2 are estimated from spin-lattice relaxation times in the laboratory frame T1 and spin-lattice relaxation times in the rotating frame T1rho measured at the low static magnetic field. The improved formula together with distributed residual dipolar couplings is applied to several samples of elastomers, and residual dipolar couplings are estimated. A good correlation between a swelling ratio and the residual dipolar coupling is obtained.

摘要

重新考虑了用于弹性体的质子横向磁化衰减公式。通过引入弛豫贡献对其进行了改进。从在低静态磁场下测量的实验室框架中的自旋-晶格弛豫时间 T1 和旋转框架中的自旋-晶格弛豫时间 T1rho 估算自旋-自旋弛豫时间 T2。将改进后的公式与分布的偶极偶合残差一起应用于几种弹性体样品，并估算了偶极偶合残差。得到了溶胀比与偶极偶合残差之间的良好相关性。