When a quiescent molten polymer is cooled below the equilibrium melting temperature, crystals (spherulites) appear and keep growing as long as the temperature ranges between the melting temperature and the glass transition temperature. The crystallization process depends upon temperature and crystalline microstructure. In particular, the reduction of the free volume and subsequent impingement between crystals influence both nucleation and growth rates of spherulites. Below the glass transition temperature, the polymer consists of crystal and amorphous phases. In the sequel we discuss a mathematical model for a bidimensional isothermal crystallization process which takes into account the nucleation, growth, and impingement of spherulites.
Paolini, M., Caselli, R., Mazzullo, S., Verdi, C., Models, experiments, and numerical simulation of isothermal crystallization of polymers, Comunicazione, in Proceedings of the Seventh European Conference on Mathematics in Industry, (Montecatini-Terme, 02-06 March 1993), B. G. Teubner, Stuttgart 1994: 167-174 [http://hdl.handle.net/10807/25447]
Models, experiments, and numerical simulation of isothermal crystallization of polymers
Paolini, Maurizio;
1994
Abstract
When a quiescent molten polymer is cooled below the equilibrium melting temperature, crystals (spherulites) appear and keep growing as long as the temperature ranges between the melting temperature and the glass transition temperature. The crystallization process depends upon temperature and crystalline microstructure. In particular, the reduction of the free volume and subsequent impingement between crystals influence both nucleation and growth rates of spherulites. Below the glass transition temperature, the polymer consists of crystal and amorphous phases. In the sequel we discuss a mathematical model for a bidimensional isothermal crystallization process which takes into account the nucleation, growth, and impingement of spherulites.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.