Determination of local mechanical stresses in dyed poly(ethylene terephthalate) by IR spectroscopy
β Scribed by D. Saidov; Kh. Khabibulloev; R. M. Marupov; V. I. Dasturi; M. S. Umarova
- Publisher
- Springer US
- Year
- 1979
- Tongue
- English
- Weight
- 237 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0021-9037
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## Abstract Near infrared (NIR) transmission spectra recorded from poly(ethylene trerephthalate) (PET) melt contain a sufficient amount of information to estimate the number of carboxylic end groups and the relative viscosity. Inβline monitoring of these quality parameters is feasible.
Poly(ethylene terephthalate) (PET) and bisphenol-A polycarbonate (PC) are melt-mixed in equimolar ratios under various conditions to get a series of PET-PC copolymers. Samples from each copolymer are characterized by differential scanning calorimetry, 1 H and 13 C nuclear magnetic resonance (NMR), s