An infrared spectroscopic study of molecular orientation in heat-set poly(ethylene terephthalate) yarn using attenuated total reflection technique
✍ Scribed by A. K. Jain; V. B. Gupta
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 448 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The attenuated total reflection (ATR) technique has been used to obtain infrared spectra of heat-set poly(ethy1ene terephthalate) ( P E T ) fibers. The trans and gauche content have been estimated from the ahsorhances of the trans hand at 1342 cm-', the gauche hand a t 1370 cm-', and the internal standard hand at 1410 cm-'. The trans orientation, as calculated from the dichroic ratios of the absorption hands a t 1342,972 and 846 cm-', shows a decreasing trend with an increase in heat-setting temperature. The overall molecular orientation, as calculated from the absorption hands at 1410 and 875 cm-', also decreases slightly with an increase in heat-setting temperature. The infrared data, in combination with X-ray data, have been used to calculate the amorphous orientation factor. The ATR technique is shown to give quite representative values of the amorphous orientation factor.