Open AccessMicroscopic observation of the effects of elongation on the polymer chain dynamics of crosslinked polybutadiene using quasi‐elastic γ‐ray scattering
Author(s) -
Mashita Ryo,
Saito Makina,
Yoda Yoshitaka,
Kishimoto Hiroyuki,
Seto Makoto,
Kanaya Toshiji
Publication year - 2022
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577522007998
Subject(s) - elongation , intermolecular force , polybutadiene , polymer , materials science , deformation (meteorology) , scattering , relaxation (psychology) , molecular dynamics , chemical physics , dynamics (music) , stress relaxation , composite material , optics , ultimate tensile strength , chemistry , physics , computational chemistry , molecule , creep , psychology , social psychology , organic chemistry , acoustics , copolymer
A synchrotron‐radiation‐based quasi‐elastic γ‐ray scattering system has been developed that uses time‐domain interferometry to observe microscopic polymer dynamics under uniaxial deformation. The stress‐producing mechanism of crosslinked polybutadiene has been studied from a microscopic viewpoint. It was found that the mean relaxation time ⟨τ⟩ of the microscopic polymer motion observed over a relatively high temperature ( T ) range ( i.e. T −1 < 0.0045 K −1 ) increased with elongation on both the intra‐ and intermolecular scales. Following an extensive strain dependence study, it was found that the strain dependences of both the intra‐ and intermolecular ⟨τ⟩ changed with the stress dependence. It was therefore suggested that ⟨τ⟩ increased due to the constraint of the local polymer chain motion caused by elongation. The local molecular dynamics of polymer chains under uniaxial deformation could be evaluated at intra‐ and intermolecular scales separately for the first time using our method.