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Titolo:
Studies on solid-solid phase transitions of polyols by infrared spectroscopy
Autore:
Feng, HY; Liu, XD; He, SM; Wu, KZ; Zhang, JL;
Indirizzi:
Hebei Normal Univ, Dept Chem, Shijiazhuang 050016, Peoples R China Hebei Normal Univ Shijiazhuang Peoples R China 050016 6, Peoples R China
Titolo Testata:
THERMOCHIMICA ACTA
fascicolo: 1-2, volume: 348, anno: 2000,
pagine: 175 - 179
SICI:
0040-6031(20000428)348:1-2<175:SOSPTO>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
PENTAGLYCERINE-NEOPENTYLGLYCOL MIXTURES; PENTAERYTHRITOL;
Keywords:
polyol; phase transition; hydrogen bonding; infrared spectroscopy; aging; plastic crystalline phase; thermodynamics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Liu, XD Hebei Normal Univ, Dept Chem, Shijiazhuang 050016, Peoples R ChinaHebei Normal Univ Shijiazhuang Peoples R China 050016 es R China
Citazione:
H.Y. Feng et al., "Studies on solid-solid phase transitions of polyols by infrared spectroscopy", THERMOC ACT, 348(1-2), 2000, pp. 175-179

Abstract

This paper chiefly deals with the properties of polyols - a kind of energystorage material, by IR spectra. A series of infrared spectra at various temperatures were obtained for pentaerythritol (PE), pentaglycerine (PG), neopentylglycol (NPG) and their mixture NPG/PG. The experimental results (theshifts of -OH absorption band in IR spectral support the solid-solid phasetransition mechanism, which involves the reversible breaking of nearest-neighbor hydrogen bonds in the molecular crystals at transformation temperature. The correlation between the wave number shifts and the temperatures of phase transition is proposed in this paper. Finally, by means of infrared spectroscopy experiments, it is shown that aging has a great influence on the thermal properties of polyol mixtures. (C) 2000 Elsevier Science B.V. Allrights reserved.

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Documento generato il 24/09/20 alle ore 11:22:38