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Vliv rychlosti chlazení na entalpickou a objemovou relaxaci polystyrenu

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dc.title Vliv rychlosti chlazení na entalpickou a objemovou relaxaci polystyrenu cs
dc.title Effect of cooling rate on enthalpy and volume relaxation of polystyrene en
dc.contributor.author Hadač, Jiří
dc.contributor.author Říha, Pavel
dc.contributor.author Sáha, Petr
dc.contributor.author Rychwalski, Rodney
dc.contributor.author Emri, Igor
dc.contributor.author Kubát, Josef
dc.contributor.author Slobodian, Petr
dc.relation.ispartof Journal of Non-Crystalline Solids
dc.identifier.issn 0022-3093 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2007
utb.relation.volume 353
utb.relation.issue 28
dc.citation.spage 2681
dc.citation.epage 2691
dc.type article
dc.language.iso en
dc.publisher Elsevier Science B.V. en
dc.identifier.doi 10.1016/j.jnoncrysol.2007.05.017
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S0022309307004838
dc.subject teplota skelného přechodu cs
dc.subject rychlost chlazení cs
dc.subject entalpická relaxace cs
dc.subject objemová relaxace cs
dc.subject objemový modul cs
dc.subject fyzikální stárnutí cs
dc.subject glass transition temperature en
dc.subject cooling rate en
dc.subject enthalpy relaxation en
dc.subject volume relaxation en
dc.subject physical aging en
dc.subject bulk modulus en
dc.description.abstract V tomto článku jsou presentovány výsledky fyzikálního stárnutí PS o úzké distribuci molekulových vah. Relaxovaná entalpie a objem jsou měřeny jako vliv rychlosti chlazení a teploty relaxace. Data jsou popsána TNM modelem a KWW relaxační funkcí. Poměr dh/dv dává hodnotu podobnou objemovému modulu, cca. 1.8GPa, přesahující teoretické předpoklady. cs
dc.description.abstract This paper presents the results of measurements of physical aging on polystyrene with a narrow molecular weight distribution (Mw/Mn = 1.03). The evolution of the aging process was followed by recording the relaxed enthalpy and the accompanying decrease in volume, using differential scanning calorimetry and mercury-in-glass dilatometry, respectively. The measurements were carried out after cooling the sample at constant rate to the aging temperature. The cooling rate varied between 0.0037 and 1 °C/min. The aging data were fitted with the KWW and the TNM functions. The differences in the time scales of enthalpy, h, and volume, v, relaxation were relatively small. From the h(v) graphs the derivative dh/dv was found to amount to about 1.8 GPa, a value significantly exceeding the predictions of the thermodynamic model containing an additional internal variable. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1000820
utb.identifier.rivid RIV/70883521:28110/07:63505436
utb.identifier.obdid 16553041
utb.identifier.scopus 2-s2.0-34447498888
utb.identifier.wok 000248925300001
utb.source j-riv
utb.contributor.internalauthor Hadač, Jiří
utb.contributor.internalauthor Sáha, Petr
utb.contributor.internalauthor Kubát, Josef
utb.contributor.internalauthor Slobodian, Petr
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