Počet záznamů: 1
Effect of aging time on a glass transition of amorphous polymers at heating
- 1.
SYSNO ASEP 0429166 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Effect of aging time on a glass transition of amorphous polymers at heating Tvůrce(i) Hadač, J. (CZ)
Říha, Pavel (UH-J) SAI, ORCID, RID
Slobodian, P. (CZ)
Saha, P. (CZ)
Kubát, J. (SE)Zdroj.dok. Chemické listy. - : Česká společnost chemická - ISSN 0009-2770
Roč. 108, special issue 1 (2014), s. 59-65Poč.str. 7 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. CZ - Česká republika Klíč. slova physical aging ; glass transition ; PMMA ; relaxation function Vědní obor RIV BK - Mechanika tekutin Institucionální podpora UH-J - RVO:67985874 CEZ AV0Z20600510 - UH-J (2005-2011) UT WOS 000344829700012 EID SCOPUS 84901818984 Anotace The relaxation and consolidation processes accompanying the glass transition are linked in this paper with an induction mechanism introducing a cooperative character of relaxation into those processes. The induction mechanism supplements the proposition underlying the internal energy material clock used in a recently developed thermodynamically consistent non-linear viscoelastic theory modeling thermal and mechanical behavior of amorphous polymers in the glass transition range1,2. The mechanism is introduced into the constitutive theory framework where it replaces the stretched exponential relaxation functions. The proposed modification is used to describe the dilatometric behavior of PMMA during heating from the glassy state after varying aging times. The modified theoretical approach is found to produce a fairly good description of the peaks in thermal expansivity, both with regard to their intensity and position along the temperature axis. The length of the aging period in the glassy state is found to affect the material time scale while the relaxation functions are unchanged Pracoviště Ústav pro hydrodynamiku Kontakt Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Rok sběru 2015
Počet záznamů: 1