Configurational heat capacity of various polymers above the glass transition temperature

Autor: Itaru Tsukushi, Eri Nishiyama, Marika Yokota
Rok vydání: 2021
Předmět:
Zdroj: Polymer Journal. 54:259-267
ISSN: 1349-0540
0032-3896
DOI: 10.1038/s41428-021-00582-z
Popis: We estimated the configurational heat capacity for 21 types of polymers above the glass transition temperature (Tg) using molecular vibration analysis. The polymers for which the configurational heat capacity was determined are listed as follows: six types of linear polymers with a carbon backbone: poly(1-butene) (PBE), poly(methyl acrylate) (PMA), poly(1-hexene) (PHE), polyisoprene (PIP), poly(vinyl fluoride) (PVF), polypropylene (PP), eight types of polyesters: poly(glycolide) (PGL), poly(propiolactone) (PPL), poly(butyrolactone) (PBL), poly(valerolactone) (PVL), polycaprolactone (PCL), polyundecanolactone (PUDL), polytridecanolactone (PTDL) and polypentadecanolactone (PPDL), and seven types of poly(oxide): poly(oxytrimethylene) (PO3M), poly(oxytetramethylene) (PO4M), poly(oxypropylene) (POP), poly(oxymethylene-oxytetramethylene) (POMOM), poly(oxymethylene-oxyethylene) (POMOE), poly(oxyethylene) (POE), and PO4M), poly(oxy(2,6-dimethyl-1,4-phenylene)) (PODMP). As the temperature increases, the configurational heat capacity of all polymers decreases. Based on Landau’s theory, the obtained heat capacity can be well reproduced by using power and logarithmic functions. We estimated the configurational heat capacity above a glass transition temperature (Tg) of 21 types of polymers for which molecular vibration analysis was already completed. The polymers for which the configurational heat capacity was determined are six types of linear polymers with a carbon backbone, eight types of polyesters, and seven types of poly(oxide)s. As temperature increases, the configurational heat capacity of all polymers decreases. Based on Landau’s theory, the obtained heat capacity can be well reproduced by the power and logarithmic functions.
Databáze: OpenAIRE
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