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CPP: Chemische Physik und Polymerphysik

CPP 27: POSTER Polymer Physics and Materials

CPP 27.44: Poster

Donnerstag, 30. März 2006, 17:00–19:00, P2

Kinetics of isothermal crystallisation and melting-recrystallisation of iPP, iPS, PET and PBT — •J. Heeg, A. Minakov, and C. Schick — University of Rostock, Institute of Physics, Universitätsplatz 3, 18051 Rostock, Germany

Isothermal crystallisation and melting-recrystallisation were investigated by the help of Fast Scanning Chip Calorimetry and DSC (Differential Scanning Calorimetry). For the purpose of fast scanning a commercially available chip calorimeter was used. The implanted heater in combination with non-adiabatic operation gave the possibility for both controlled fast heating and cooling. Crystallization kinetics of the slowly crystallising iPS and PET were studied on a PerkinElmer PYRIS 1 DSC. PBT and iPP were investigated with the fast scanning chip calorimeter. In the case of iPP, in accordance with de Santis [1], two minima in isothermal melt crystallisation half time were observed. These can be explained by the formation of two different phases in iPP. Namely, the crystalline alpha-modification and the mesomorphic phase. Additionally isothermal cold crystallisation experiments gave no evidence for preferring a certain crystallising temperature in case of the alpha-modification. Only the mesomorphic phase gave again a pronounced peak in crystallisation half time. Suprisingly, for PBT two minima in crystallisation half time were found too, for both melt and cold crystallisation. The reason for this is not yet understood. Beside crystallization kinetics recrystallization kinetics will be discussed too.

[1] F. de Santis, C. Schick, in preparation for publication.