Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Poster: Crystallisation, Nucleation and Self assembly
CPP 17.8: Poster
Dienstag, 27. März 2012, 18:15–20:15, Poster A
Nucleation and Crystallization in Glassy Polymers (PCL, iPP) — Evgeny Zhuravlev1, Daniela Mileva2, René Androsch2, and •Christoph Schick1 — 1Universität Rostock, Institut für Physik, Rostock, Germany — 2Martin-Luther-Universität Halle-Wittenberg, Polymer Engineering Center of Engineering Sciences, Halle/Saale, Germany
Differential fast scanning chip calorimetry has been employed to study nucleation/ordering during annealing the glass of quenched polymers (PCL, iPP). Initially non-ordered samples were annealed below the glass transition temperature for different periods of time, and the change of structure during isothermal annealing was then analyzed by monitoring the exchange of latent heat on heating. Primary result of this work is the undoubted proof of homogeneous nucleation of ordering and mesophase formation in the glassy state. It is suggested that only local mobility of molecular segments is required to form small, ordered domains, and that the classical nucleation theory, which restricts nucleation of the crystallization/ordering process of polymers to temperatures between the equilibrium melting temperature and the glass transition temperature, needs modification.