Raman spectra of poly(ethylene glycols) in solution
โ Scribed by Koenig, J. L. ;Angood, A. C.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1970
- Tongue
- English
- Weight
- 510 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0449-2978
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โฆ Synopsis
Abstract
Raman spectra have been obtained from poly(ethylene glycol) (PEG) in the solid and molten phases and in aqueous and chloroform solutions. Several new lines are observed or resolved in the Raman spectrum of the solid state as a result of using a highโpower argonโion laser as a source. The Raman spectra of the molten polymer and the chloroform solutions are indicative of a disordered structure, since additional Raman lines appear as a result of the additional rotational isomers. The Raman spectrum of the aqueous solution shows that considerably less structural change occurs upon dissolution in water.
๐ SIMILAR VOLUMES
The average relaxation time relaxation times corresponding to seg-q 0 , mental motion and group rotations of a series of binary mixtures of q 1 q 2 , poly(ethylene glycols) (PEG 200 ] PEG 300, PEG 400 ] PEG 600, PEG 1500 ] PEG 4000, PEG 6000 ] PEG 9000, PEG 200 ] PEG 1500, PEG 300 ] PEG 4000, PEG 40
## Abstract The aqueous solutions of triblock copolymers of poly(ethylene glycol)โpoly(ฯตโcaprolactoneโ__co__โglycolide)โpoly(ethylene glycol) [PEGโP(CLโGA)โPEG] undergoing solโgel transition as the temperature increases from 20 to 60ยฐC were successfully prepared. The thermogelling block copolymers
## Abstract The unperturbed molecular dimensions of poly(ethylene glycol) (PEG) samples (of different molecular weights) have been evaluated in aqueous solutions from viscosity measurements at 25, 30, 35, and 40ยฐC. The unperturbed dimension, __K__~ฮธ~, has been determined from extrapolation methods,