2021年
Visualization of Nonequilibrium Properties of a Crystalline Polymer: Formation of Ring-Lite Due to the Gibbs-Thomson Effect and Dark-Ring Due to the Melting Point Inversion
Crystal Growth and Design
- ,
- ,
- ,
- 巻
- 22
- 号
- 1
- 開始ページ
- 441
- 終了ページ
- 448
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acs.cgd.1c01069
A polymer crystallite having a ring-like morphology was obtained by combining the nonequilibrium nature of a polymeric material and a rapid temperature-jump technique. Termed "ring-lite"here, it consists of the concentrically arranged crystalline and molten regions of a single-component polymer. During the growing process of a spherulite, crystallization temperature Tc was, in turn, changed between low and high temperatures at certain intervals. In this way, bimodal melting temperatures Tm due to the Gibbs-Thomson effect were alternately imprinted within an identical spherulite. Subsequently, the sample was heated so rapidly that only the region having higher Tm remained in a crystalline state. Importantly, inversion of the melting point was also microscopically visualized as a "dark-ring". Contrary to the appearance of ring-lites due to the "normal"Gibbs-Thomson effect, we found that a specific heating rate caused the region having originally a lower Tm to remain in a crystalline state and that with originally a higher Tm to melt, i.e., display inversion of the melting point. The occurrence of the melting point inversion was confirmed by heating rate variation measurements of fast-scan chip calorimetry (FSC).
- リンク情報
- ID情報
-
- DOI : 10.1021/acs.cgd.1c01069
- ISSN : 1528-7483
- eISSN : 1528-7505
- SCOPUS ID : 85119920342