Elucidation of the Chain Conformation in a Glassy Polyester, PET, by Two-Dimensional NMR-Reference-Cited by-同舟云学术

Elucidation of the Chain Conformation in a Glassy Polyester, PET, by Two-Dimensional NMR

Published:1998-05 Issue:5364 Volume:280 Page:714-717
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Schmidt-Rohr K.¹²,Hu W.¹²,Zumbulyadis N.¹²

Affiliation:

1. K. Schmidt-Rohr and W. Hu, Department of Polymer Science and Engineering, University of Massachusetts, Amherst, MA 01003, USA.

2. N. Zumbulyadis, Imaging Research and Advanced Development, Eastman Kodak Company, Rochester, NY 14650–2132, USA.

Abstract

The chain conformation of glassy poly(ethylene terephthalate) (PET) was characterized by two-dimensional double-quantum nuclear magnetic resonance (NMR). In amorphous carbon-13–labeled PET, the statistics of the O– 13 CH 2 – 13 CH 2 –O torsion angle were determined, on the basis of the distinct shapes of the two-dimensional NMR patterns of trans and gauche conformations. In crystalline PET, the trans content is 100 percent, but in the amorphous PET it is only 14 percent (±5 percent). An average gauche torsion angle of 70 degrees (±9 degrees) was obtained. Implications for materials properties of polyesters are discussed.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference36 articles.

1. Chemical Week 19 June 1996 p. 38.

2. P. J. Flory Statistical Mechanics of Chain Molecules (Wiley-Interscience New York 1969) pp. 190–192.

3. W. L. Mattice and U. W. Suter Conformational Theory of Large Molecules (Wiley New York 1994) pp. 234–237.

4. R. de Daubeny P., Bunn C. W., Brown C. J., Proc. R. Soc. London Ser. A 226, 531 (1954).

5. Trans is also known as (fully staggered) anti or antiperiplanar and gauche is also known as synclinal. The trans conformation of PET is shown in Fig. 1.

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