Phase and state transition effects on dielectric, mechanical, and thermal properties of polyols

Citation
Ra. Talja et Yh. Roos, Phase and state transition effects on dielectric, mechanical, and thermal properties of polyols, THERMOC ACT, 380(2), 2001, pp. 109-121
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
THERMOCHIMICA ACTA
ISSN journal
0040-6031 → ACNP
Volume
380
Issue
2
Year of publication
2001
Pages
109 - 121
Database
ISI
SICI code
0040-6031(200112)380:2<109:PASTEO>2.0.ZU;2-W
Abstract
The present study investigated the glass transition, crystallisation and me lting behaviour of erythritol, xylitol, and glucitol (sorbitol) using diele ctric analysis (DEA), differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA). Sorbitol and xylitol were plasticised by water a nd their glass transition temperatures decreased when water content was inc reased, Erythritol crystallised rapidly, and its water plasticisation behav iour could not be determined. Melting of the crystalline polyols occurred a t their specific melting temperatures. Melts of erythritol and xylitol crys tallised on recooling and no glass transition was apparent on reheating. Qu ench cooled sorbitol melt remained amorphous and showed a glass transition on reheating. Glass transition and crystallisation were apparent in the DSC thermogram. and the dielectric and the dynamic mechanical spectra of mixtu res of amorphous and crystalline xylitol. (C) 2001 Elsevier Science B.V. Al l rights reserved.