Glass Transition and its Characteristic Length for Thin Crosslinked Polystyrene Shells of Rodlike Capsules

Material type: 文書・図像類

Author: SASAKI, TAKASHIほか

Publisher: JOHN WILEY & SONS INC

Publication date: 2008-10-01

Material Format: Digital

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Note (General)：: Rodlike capsules consisting of a calcium carbonate core and a crosslinked polystyrene shell were synthesized, and the glass transition temperature (T_...

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Material Type: 文書・図像類
Title: Glass Transition and its Characteristic Length for Thin Crosslinked Polystyrene Shells of Rodlike Capsules
Author/Editor: SASAKI, TAKASHI
MISU, MANABU
SHIMADA, TAKAYUKI
TERAMOTO, MITSUHIRO
Author Heading: SASAKI, TAKASHI
MISU, MANABU
SHIMADA, TAKAYUKI
TERAMOTO, MITSUHIRO
Publication, Distribution, etc.: JOHN WILEY & SONS INC
Publication Date: 2008-10-01
Publication Date (W3CDTF): 2008-10-01
Periodical title: JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
No. or year of volume/issue: 46 19
Volume: 46
Issue: 19
Pages: 2116-2125
Text Language Code: eng
Subject Heading: core/shell and hollow capsules
polystyrene
glass transition
characteristic length
TMDSC
Target Audience: 一般
Note (General): Rodlike capsules consisting of a calcium carbonate core and a crosslinked polystyrene shell were synthesized, and the glass transition temperature (T_g) and characteristic length of the glass transition ξ(T_g) for the thin outer shells were investigated by temperature-modulated differential scanning calorimetry. The shell thickness ranged from 20 to 129 nm. The ratio of the Tg for the outer shell to the bulk T_g increases with decreasing shell thickness d. The d-dependence of T_g is interpreted in terms of a simple two-layer model which assumes that an immobile layer exists near the core-shell interface. Shells of hollow capsules unexpectedly exhibit a similar d-dependence of T_g to that for the filled capsules. This is characteristic of the crosslinked polymeric shells, and is attributed to certain spatial heterogeneity of crosslink distribution, and/or to the unstable configuration in the ultrathin shell that does not undergo relaxation due to the crosslink. The latter idea is based on the assumption that unstable configurational state is responsible for the Tg shift from the bulk value observed for nanosized polymeric materials. The ratio of the characteristic length for the shell of the filled capsule to that of the bulk ξ_f(T_g) /ξ_b(T_g) decreases with decreasing d. The results are interpreted in terms of the configurational entropy, and it is also suggested that the configurational state of network polymer chains in the shell affects the characteristic length.
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 福井大学 : 福井大学学術機関リポジトリ