ツクシ　イタル   TSUKUSHI Itaru   筑紫　格    所属   千葉工業大学  工学部 教育センター（工学部）    千葉工業大学  工学研究科 工学専攻    千葉工業大学  工学研究科 応用化学専攻    職種   教授
言語種別	英語
発行・発表の年月	2021/09/05
形態種別	学術雑誌
査読	査読あり
標題	Estimation of the Configurational Heat Capacity of Polyisobutylene, Isobutane and 2,2,4-Isomethylpentane above the Glass Transition Temperature
執筆形態	共著
掲載誌名	Polymer Journal
掲載区分	国外
出版社・発行元	The Society of Polymer science, Japan
巻・号・頁	53(9),pp.1031-1036
総ページ数	6
担当区分	最終著者,責任著者
著者・共著者	Eri Nishiyama, Marika Yokota, Itaru Tsukushi
概要	In this study, the absolute values for the configurational heat capacity of polyisobutylene (PIB), isobutane (which corresponds to the monomer of PIB), and 2,2,4-isomethylpentane (which corresponds to the dimer of PIB) were estimated based on the assumption that skeletal and group vibration modes do not change before and after the glass transition. The configurational heat capacities evaluated for these three substances decreased with increasing temperature. This temperature dependence of the configurational heat capacity is the same as that previously observed for molecular glass, which has a simple molecular structure. Additionally, the configurational heat capacities for the three substances were found to be different at the same temperature. This suggests that interactions with the surroundings that determine the configuration and orientation of the molecules differ as the molecular weight changes.