The Glass Transition of Wool: An Improved Determination Using DSC

Autor:	Russell Ian Maxwell, Anthony P. Pierlot, Julie M. Kure, Robert A. Shanks
Rok vydání:	1997
Předmět:	Materials science Differential scanning calorimetry Polymers and Plastics Wool Chemical Engineering (miscellaneous) Composite material Glass transition Water content
Zdroj:	Textile Research Journal. 67:18-22
ISSN:	1746-7748 0040-5175
DOI:	10.1177/004051759706700106
Popis:	The glass transition temperature ( Tg) of wool and its dependence on water content is reinvestigated using differential scanning calorimetry (dsc). Previous studies with dsc have not accounted for the influence of thermal history, which may introduce a large variability in Tg measurements. Because the Tg of wool is an important parameter affecting textile performance and properties, it needs to be clearly defined. When the finite volume of the water-impenetrable phase is taken into account, an important correction of the Fox equation is obtained, describing the dependence of Tg on water content. On melting of the water-impenetrable crystalline regions, a reduction in the temperature range of the glass transition region is apparent, suggesting that the crystalline regions behave in a manner analogous to filler particles in rubber. The ratio of the change in heat capacity at the glass transition, before and after melting, may provide a way to estimate the crystalline weight fraction in native wool.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e9b6c5b2c17ea81d1467c7a1088cf5bf https://doi.org/10.1177/004051759706700106 Zobrazit plný text záznamu