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CPP: Chemische Physik und Polymerphysik

CPP 11: POSTER Disperse Polymer Systems

CPP 11.14: Poster

Tuesday, March 28, 2006, 17:00–19:00, P3

Rigid Amorphous Fraction of Semicrystalline Polymers and Polymer Nanocomposites — •Andreas Wurm, Albert Sargsyan, and Christoph Schick — University of Rostock, Institute of Physics, Universitätsplatz 3, 18051 Rostock, Germany

For semicrystalline polymers the observed relaxation strength at glass transition is often significantly smaller than expected from the non-crystalline fraction. This observation leads to the introduction of a rigid amorphous fraction (RAF) which does not contribute to the heat of fusion or X-ray crystallinity nor to the relaxation strength at glass transition. The RAF is non-crystalline and in a glassy state above the common glass transition temperature.

From heat capacity the temperature and time dependence of the RAF can be obtained. For PC, PHB and sPP it is possible to study the creation and disappearance of the RAF in situ during isothermal crystallization and on stepwise melting.

A RAF can be detected for polymer nano-composites too. The amount and the thermal stability of the RAF in such systems will also be discussed.