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A T 1 ρ spin lattice relaxation study of the molecular motions of a semicrystalline polyimide matrix
Author(s) -
Russell Ver M.,
Koenig Jack L.
Publication year - 1996
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.10598
Subject(s) - polyimide , crystallinity , materials science , relaxation (psychology) , lattice (music) , spectrometer , solid state , spectroscopy , analytical chemistry (journal) , matrix (chemical analysis) , composite material , nuclear magnetic resonance , chemical physics , chemistry , organic chemistry , optics , physics , psychology , social psychology , layer (electronics) , quantum mechanics , acoustics
The kHz molecular motion of a semicrystalline polyimide was studied through 13 C solid state NMR spectroscopy. Variable temperature T 1 ρexperiments were performed on a Bruker msl‐300 spectrometer for various B 1 applied radio frequency fields. Similar activation energies of motion for different carbon atoms in the flexible spacer gave evidence of a group motion of this molecular segment. It was also found that aromatic activation energies were higher than those of aliphatic carbons.