In:
The Journal of Chemical Physics, AIP Publishing, Vol. 100, No. 6 ( 1994-03-15), p. 4591-4600
Abstract:
A deuterium NMR (nuclear magnetic resonance) method is proposed to investigate long-time correlation of chain orientation in poly(dimethylsiloxane) networks. It is based on the observation of a quadrupolar echo after a Jeener pulse sequence, which is possible owing to the presence of nonzero residual interactions in the system related to local chain orientations. The time evolution of the quadrupolar echo amplitude is calculated in the framework of a slow chain reorientational motion. An experimental result is presented which shows that local orientation is frozen within the time scale investigated, up to 0.3 s.
Type of Medium:
Online Resource
ISSN:
0021-9606
,
1089-7690
Language:
English
Publisher:
AIP Publishing
Publication Date:
1994
detail.hit.zdb_id:
3113-6
detail.hit.zdb_id:
1473050-9
