title: Conformation of drawn poly(trimethylene terephthalate) studied by solid-state 13C NMR.
abstract: The change in the conformation of the flexible O-CH2-CH2-CH2-O segment of poly(trimethylene terephthalate) (PTT) monofilament caused by drawing was investigated by means of the gamma-gauche effect on the 13C solid-state NMR chemical shift of the internal methylene carbon, combined with the NMR relaxations. The conformation around the O-CH2 and CH2-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.
authors.affiliation: National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8634, Japan.
authors.forename: Tsunenori
authors.initials: T
authors.lastname: Kameda
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Miyazawa
authors.forename: Shigemitsu
authors.initials: S
authors.lastname: Murase