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— The phase-field method has been developed to simulate the crystal growth of semi-crystalline polymer during cooling stage by considering the effect of temperature on the nucleation density. It assumes that the nucleation mechanism is heterogeneous, and the relationship between the nucleation density and the temperature is described by an empirical function. The crystal growth after nucleation is modeled by a modified phase-field method which uses a non-conserved crystal order parameter to indicate whether the material is solid or liquid. By using the proposed model, the influence of cooling rate on the crystallization morphologies and crystallization kinetics has been investigated. Index Terms—Polymer, crystallization, phase-field, cooling. polycrystalline growth of polymers and reveal the I. I NTRODUCTION It is well known that polymer is one of the most important technical materials in our daily life. The cooling conditions imposed during polymer processing affect the crystallization morphologies of semi-crystalline polymers, thus determining the final properties of polymeric products. Therefore, the prediction of microstructure formation in semi-crystalline polymers during cooling stage is of great importance. For doing this, it is essential to establish an effective numerical model to predict the crystallization morphologies. The simulated results may supply theoretical basis for controlling or optimizing the fabrication procedures.

Phase-Field Simulation of Polymer Crystallization during Cooling Stage