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An investigation of 1 H and 13 C longitudinal relaxation and relaxation in the rotating frame in solid poly( N ‐vinylcarbazole)
Author(s) -
Heatley Frank,
Karali Aglaia,
Dais Photis
Publication year - 2001
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.727
Subject(s) - relaxation (psychology) , spin–lattice relaxation , nitrogen , spin diffusion , paramagnetism , spin–spin relaxation , diffusion , materials science , magnetic relaxation , nuclear magnetic resonance , chemistry , analytical chemistry (journal) , thermodynamics , magnetic field , condensed matter physics , physics , magnetization , organic chemistry , psychology , social psychology , quantum mechanics
1 H and 13 C longitudinal relaxation times ( T 1 ) and relaxation times in the rotating frame ( T 1ρ ) have been measured for poly( N ‐vinylcarbazole) in the solid state in air and nitrogen atmospheres in an attempt to elucidate molecular motions. In air, the T 1 relaxation of both 1 H and 13 C was dominated by interaction with absorbed paramagnetic oxygen. In nitrogen, the 13 C T 1 relaxation times were long (>300 s) and were averaged by 13 C– 13 C spin diffusion. The 13 C T 1ρ relaxation times showed an exponential dependence on the strength of the rotating 13 C magnetic field and were thus controlled by spin–spin processes rather than spin–lattice processes. © 2001 Society of Chemical Industry