Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 11: POSTER Disperse Polymer Systems
CPP 11.44: Poster
Dienstag, 28. März 2006, 17:00–19:00, P3
Rigid Amorphous Fraction of Polymer Nanocomposites and Semicrystaline Polymers — •Albert Sargsyan1, Selvin Thomas2, Andreas Wurm1, Sabu Thomas2, and Christoph Schick1 — 1aUniversity Rostock, Dept. Physics, Universitätsplatz 3, 18051 Rostock, Germany — 2Mahatma Gandhi University, School of Chemical Sciences, Kottayam, India
Very often semicrystalline polymers cause significantly smaller relaxation strength at glass transition than expected from the non-crystalline fraction. This observation could be explained by 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 approximate amount of the RAF was calculated taking into account the difference in Δcp step between pure and filled polystyrene nano-composites. The solvents added as plasticizers haven’t entered into the RAF even above the glass transition temperature (Tg). This gives the opportunity to create highly solvent resistant polymer nano-composites based on common polymers like polystyrene.