Analysis of the configurational heat capacity of polystyrene and its monomer and oligomer above the glass transition temperature

Autor: Marika Yokota, Itaru Tsukushi, Eri Nishiyama
Rok vydání: 2021
Předmět:
Zdroj: Polymer Journal. 54:33-39
ISSN: 1349-0540
0032-3896
DOI: 10.1038/s41428-021-00554-3
Popis: In this study, we investigated the functions that reproduce the configurational heat capacity (Cconfig) above the glass transition temperature for polystyrene (PS), polyisobutylene (PIB), and their oligomers. The results show that Cconfig can be well reproduced using the power and logarithmic functions based on Landau theory, which explains the vicinity of the critical point. The power and logarithmic functions had four and three fitting parameters, respectively. The error ranges were ~±2% for PS and ±5% for PIB. We investigated the functions that reproduce the configurational heat capacity (Cconfig) that occurs above the glass transition temperature for polystyrene (PS), polyisobutylene (PIB), and their oligomers. The results show that Cconfig could be well reproduced using the power and logarithmic functions based on the Landau theory. The power and logarithmic functions had four and three fitting parameters, respectively. The error ranges were approximately ±2% for PS and ±5% for PIB. At this stage, the two functions are not functions with the clear physical meanings but the practical functions that were evaluated using regression analysis and simply reproduce the configurational heat capacity.
Databáze: OpenAIRE
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