Details

Autor(en) / Beteiligte

• McKenzie, Iain
• Cordoni-Jordan, Danaan
• Cannon, Joseph
• Cottrell, Stephen P

Titel

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.