6533b852fe1ef96bd12aad7f
RESEARCH PRODUCT
Spatial heterogeneity in glassy polystyrene detected by deuteron NMR relaxation
Gregor DiezemannA. DößHans SillescuGerald HinzeRoland Böhmersubject
Polymers and PlasticsGeneral Chemical EngineeringRelaxation (NMR)Spin–lattice relaxationAnalytical chemistryNuclear magnetic resonance spectroscopy530Condensed Matter::Disordered Systems and Neural NetworksCondensed Matter::Soft Condensed MatterMagnetizationchemistry.chemical_compoundDeuteriumchemistryChemical physicsPolystyrenePhysics::Chemical PhysicsSupercoolingGlass transitiondescription
Using deuteron NMR, the dynamics of supercooled polystyrene-d 3 was investigated near the calorimetric glass transition. At these temperatures non-exponential spin lattice relaxation is found, indicating the presence of spatial heterogeneity. With increasing temperature, structural relaxation becomes fast enough to average efficiently over different spatial environments, leading to exponential magnetization decays. A qualitative comparison with toluene as a representative of a low molecular weight glass former is carried out. Indications are found that in polystyrene the observed averaging process is more effective at T g than it is in toluene.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-02-27 | Acta Polymerica |