Solid-state characterization of poly(ethylene glycol) samples prepared by solvent cast technique
Yükleniyor...
Tarih
2017
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Bulgarian Acad Science
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The effect of solvents (H-donor; H-acceptor and both H-acceptor and H-donor solvents) casted on the poly(ethylene glycol) (PEG) samples with varying molecular weights (2000, 4600, 8000 and 10000) was performed solid-state characterization by Fourier Transform Infrared Spectroscopy (FTIR), Raman and X-ray Diffraction (XRD) in submitted study. In this study, spectral differences were classified with respect to stretching, bending, rocking, angle bending, internal rotation frequencies and low-frequency Raman region according to functional groups and thus crystallinity were evaluated as related with solvent character and polymer molecular weight. Crystalline and amorphous regions in the XRD diffractograms have been found by Polynomial Regression method through Microsoft Office Excel program and subsequently, crystallinity percentages were evaluated. From XRD spectra of PEG/solvent systems, the highest decrease in crystallinity percent has been detected in the sample cast from tetrahydrofuran. On the other hand, the largest frequency shifts of various stretching and bending vibrations of PEG have been observed for the samples cast from chloroform and especially tetrahydrofuran in FTIR and Raman spectra. In the end of trio study, the parallelism of both computation and thermodynamic and spectroscopic data about solubility profiles of PEG/solvent systems has been determined. The results indicated that association power of solvents in PEG samples prepared by solvent cast technique was decreased below order: tetrahydrofuran > chloroform > dimethyl sulfoxide > methanol > water.
Açıklama
3rd International Conference on New Trends in Chemistry -- APR 28-30, 2017 -- Helsinki, FINLAND
Anahtar Kelimeler
Poly(ethylene glycol), solvent cast technique, fourier transform infrared spectroscopy, raman, x-ray diffraction
Kaynak
Bulgarian Chemical Communications
WoS Q DeÄŸeri
Q4
Scopus Q DeÄŸeri
Cilt
49
