Orientation in uniaxially drawn poly(ethylene terephthalate) (PET) film by two-dimensional 13C n.m.r. and FTi.r. spectroscopy
✍ Scribed by N.J. Clayden; J.G. Eaves; L. Croot
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 438 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0032-3861
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✦ Synopsis
Two-dimensional magic angle spinning (2D-MAS) =3C n.m.r, spectroscopy and FTi.r. microscopy have been used to measure the orientation in uniaxially drawn film as a function of draw ratio. Results obtained agree well with those obtained by optical birefringence measurements. FTi.r. microscopy is a powerful method for mapping the orientation across the film thickness with quick data collection and analysis. The strength of the 2D-MAS n.m.r, method lies in its chemical and phase selectivity while its weakness lies in the time-consuming data acquisition and analysis coupled with the lack of knowledge about the orientation of the chemical shift tensor in the molecular frame.