The calorimetric trace of polymer spheres shows an increase of the glass-transition temperature (Tg), with respect to its bulk value. This increase is evaluated by means of an entropy model, where the 3D confinement leads to a limiting number of repeating polymer units in the sphere, and thus to a reduction of the possible configuration states of the polymer chains. This is ultimately related to variations in the bulk value of the Tg. Also, the way the polymer nature affects how confinement takes place and how restrictions imposed affect the way a polymer forms cooperative rearranging regions at Tgare presented. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Does the glass transition of polymers change upon 3D confinement? / Martínez-Tong, Daniel E.; Cui, Jing; Soccio, Michelina; García, Carolina; Ezquerra, Tiberio A.; Nogales, Aurora. - In: MACROMOLECULAR CHEMISTRY AND PHYSICS. - ISSN 1022-1352. - ELETTRONICO. - 215:17(2014), pp. 1620-1624. [10.1002/macp.201400244]
Does the glass transition of polymers change upon 3D confinement?
Soccio, MichelinaMembro del Collaboration Group
;
2014
Abstract
The calorimetric trace of polymer spheres shows an increase of the glass-transition temperature (Tg), with respect to its bulk value. This increase is evaluated by means of an entropy model, where the 3D confinement leads to a limiting number of repeating polymer units in the sphere, and thus to a reduction of the possible configuration states of the polymer chains. This is ultimately related to variations in the bulk value of the Tg. Also, the way the polymer nature affects how confinement takes place and how restrictions imposed affect the way a polymer forms cooperative rearranging regions at Tgare presented. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
