Evaluation of the absolute configurational entropy of tri-O-methyl-8-cyclodextrin, a molecule with many degrees of freedom

Article Polymer Science

Configurational heat capacity of various polymers above the glass transition temperature

Eri Nishiyama et al.

Summary: Using molecular vibration analysis, we estimated the configurational heat capacity for 21 types of polymers above the glass transition temperature, finding that as the temperature increases, the configurational heat capacity of all polymers decreases. The heat capacity obtained can be well reproduced by using power and logarithmic functions based on Landau's theory.

POLYMER JOURNAL (2022)

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Article Polymer Science

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

Eri Nishiyama et al.

Summary: This study investigated the functions that reproduce the configurational heat capacity (C-config) above the glass transition temperature for polystyrene (PS), polyisobutylene (PIB), and their oligomers. The results showed that C-config could be well reproduced using power and logarithmic functions based on Landau theory, with error ranges of approximately +/- 2% for PS and +/- 5% for PIB. The functions do not have clear physical meanings but are practical functions that simply reproduce the configurational heat capacity.

POLYMER JOURNAL (2022)

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Article Polymer Science

Estimation of the configurational heat capacity of polyisobutylene, isobutane and 2,2,4-isomethylpentane above the glass transition temperature

Eri Nishiyama et al.

Summary: This study estimated the configurational heat capacity of polyisobutylene, isobutane, and 2,2,4-isomethylpentane above the glass transition temperature, finding that their configurational heat capacities decrease with increasing temperature, and that the configurational heat capacities for the three substances are different at the same temperature.

POLYMER JOURNAL (2021)

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Article Polymer Science