论文部分内容阅读
A modified phase-field model is proposed for simulating the isothermal crystallization of polymer melts.The model consists of a second-order phase-field equation and a heat conduction equation.It obtains its model parameters from the real material parameters and is easy to use with tolerable computational cost.Due to the use of a new free energy functional form,the model can reproduce various single crystal morphologies of polymer melts under quiescent conditions,including dendritic,lamellar branching,ring-banded,breakup of ring-banded,faceted hexagonal,and spherulitic structures.Simulation results of isotactic polystyrene crystals demonstrate that the present phase-field model has the ability to give qualitative predictions of polymer crystallization under isothermal and quiescent conditions.
A modified phase-field model is proposed for simulating the isothermal crystallization of polymer melts. The model consists of a second-order phase-field equation and a heat conduction equation. It tues its model parameters from the real material parameters and is easy to use with tolerable computational cost. Due to the use of a new free energy functional form, the model can reproduce various single crystal morphologies of polymer melts under quiescent conditions, including dendritic, lamellar branching, ring-banded, breakup of ring-banded, faceted hexagonal , and spherulitic structures. Simulation results of isotactic polystyrene crystals demonstrate that the present phase-field model has the ability to give qualitative predictions of polymer crystallization under isothermal and quiescent conditions.