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Conformation of drawn poly(trimethylene terephthalate) studied by solid‐state 13 C NMR
Author(s) -
Kameda Tsunenori,
Miyazawa Mitsuhiro,
Murase Shigemitsu
Publication year - 2005
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1507
Subject(s) - chemistry , solid state , crystallography , nuclear magnetic resonance spectroscopy , polymer chemistry , stereochemistry , nuclear magnetic resonance , physics
The change in the conformation of the flexible OCH 2 CH 2 CH 2 O segment of poly(trimethylene terephthalate) (PTT) monofilament caused by drawing was investigated by means of the γ‐ gauche effect on the 13 C solid‐state NMR chemical shift of the internal methylene carbon, combined with the NMR relaxations. The conformation around the OCH 2 and CH 2 O bonds for as‐spun fiber was trans/trans . On drawing, followed by heat treatment, the conformation changed to gauche/gauche . The ratio of gauche / gauche to trans / trans for the drawn PTT fiber was determined quantitatively. Copyright © 2004 John Wiley & Sons, Ltd.