Effect of cooling rate on enthalpy and volume relaxation of polystyrene

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F07%3A63505436" target="_blank" >RIV/70883521:28110/07:63505436 - isvavai.cz</a>
Alternative codes found
RIV/67985874:_____/07:00093742
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Effect of cooling rate on enthalpy and volume relaxation of polystyrene
Original language description
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.
Czech name
Vliv rychlosti chlazení na entalpickou a objemovou relaxaci polystyrenu
Czech description
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.

Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CD - Macromolecular chemistry
OECD FORD branch
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Project
<a href="/en/project/IAA2060401" target="_blank" >IAA2060401: The effect of inner pressure on thermomechanical properties of polymers in the course of physical ageing</a><br>
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2007
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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