Institute of Fundamental Technological Research
Polish Academy of Sciences

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Giovanni Alfonso

University of Genova (IT)


Recent publications
1.  Ziabicki A., Alfonso G.C., A simple model of flow induced crystallization memory, Macromolecular Symposia, ISSN: 1521-3900, DOI: 10.1002/1521-3900(200208)185:1<211::AID-MASY211>3.0.CO;2-B, Vol.185, No.1, pp.211-231, 2002

Abstract:
Flow induced crystallization of polymer systems exhibits strong memory effects. Crystalline structures gradually change when the flow is switched off and the polymer is relaxed prior to crystallization. A simple model based on the multidimensional theory of crystal nucleation[1] is proposed. Steady, potential flow applied to a polymer fluid above melting temperature (Tp > Tm) results in molecular orientation of crystallizing units. The flow controls formation of molecular clusters which convert into athermal nuclei when the system is cooled down to crystallization temperature, Tc < Tm. Orientation effects gradually disappear when the melt is relaxed above Tm in the absence of flow or stress.

Affiliations:
Ziabicki A. - IPPT PAN
Alfonso G.C. - University of Genova (IT)

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