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Rotational Dynamics of a Probe in Rubbery Polymers Characterized by Time‐Resolved Fluorescence Anisotropy Measurement
Author(s) -
Nguyen Hung K.,
Konomi Asuka,
Sugimoto Shin,
Inutsuka Manabu,
Kawaguchi Daisuke,
Tanaka Keiji
Publication year - 2018
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201700329
Subject(s) - polymer , relaxation (psychology) , glass transition , materials science , copolymer , anisotropy , polymer chemistry , dielectric , fluorescence , chemical physics , composite material , optics , chemistry , physics , psychology , social psychology , optoelectronics
The rotational relaxation time (τ rot ) of a fluorescent molecule, coumarin 153 (C153), dispersed in different rubbery polymers is characterized by time‐resolved fluorescence anisotropy measurement, and an attempt is made to quantitatively combine it with the segmental relaxation time (τ seg ) of the corresponding matrix polymer obtained by dielectric relaxation spectroscopy. This study here demonstrates that τ seg extrapolated to higher temperatures using the Vogel–Fulcher–Tammann law can be superimposed on τ rot , resulting in a single curve. This behavior is common for polymers with different glass transition temperatures such as polyisoprene and acrylonitrile/butadiene copolymer, implying that the rotational dynamics of C153 is a useful tool for the characterization of polymer dynamics.