When is a polymer a polymer? A light scattering study of crossover from viscous fluidlike behaviour to chain constrained dynamics

• Light (Brillouin and Raman) scattering studies of a polymer (EO)n of increasing chain lenght give evidence of crossover at a length of about 25–30 backbone bonds from molecular weight Mw dependence to Mw independence in the dynamics related to the glass transition. The crossover gives an indication of the number of interacting particles and the size of the cooperatively rearranging regions in the polymer in the dynamic glass transition zone.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

Polymer

glass transition

intermolecular interactions

viscosity

dynamics

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