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Dynamics of polystyrene probed by muon spin spectroscopy
Ist Teil von
Journal of physics. Condensed matter, 2020-02, Vol.33 (6), p.065102-065102
Ort / Verlag
England: IOP Publishing
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Muon spin spectroscopic measurements were made on atactic low-molecular-weight (LMW) (1.3 kg mol−1) and high-molecular-weight (HMW) (202 kg mol−1) polystyrene. Muoniated cyclohexadienyl radicals, which are formed by muonium addition to the phenyl side groups, are used as local probes of bulk dynamics. Muon spin relaxation is caused by the secondary γ-relaxation process, which involves motion of the phenyl rings, and is sensitive to the glass transition. The activation energy of the γ-relaxation process in the rubbery state is 0.60(2) eV in the HMW sample and 0.37(3) eV in the LMW sample.