Directional Migration and Distribution of Magnetic Microparticles in Polypropylene-Matrix Magnetic Composites Molded by an Injection Molding Assisted by External Magnetic Field.
Directional Migration and Distribution of Magnetic Microparticles in Polypropylene-Matrix Magnetic Composites Molded by an Injection Molding Assisted by External Magnetic Field.
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DOI：
10.3390/ma15134632
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发表时间：
2022-07-01
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影响因子：
--
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以球形粒子为填料的表面功能化聚合物复合材料具有优良的性能，在传感器、制药工业、防冰和柔性电磁屏蔽等领域得到了广泛的应用。为了更好地获得具有显著性能的功能表面，必须研究磁性微粒在聚丙烯(PP)基磁性复合材料中的定向迁移和分散理论。提出了一种新的基于多物理场耦合的模拟模型，利用COMSOL多物理软件分析了磁性氧化铁(Fe3O4)颗粒在外加磁场辅助注射成型过程中的定向迁移和分布。为了准确地将聚合物熔体的流变现象引入到模拟模型中，采用了Carreau模型。深入讨论了颗粒尺寸、磁场强度、熔体粘度等参数对颗粒定向运动的影响。模拟模型中颗粒的定向分布得到了正确的评估，并得到了实验结果的证实。该模型为表面功能化聚合物复合材料注塑成型过程的控制、优化和研究提供了理论支持。
Surface-functionalized polymer composites with spherical particles as fillers offer great qualities and have been widely employed in applications of sensors, pharmaceutical industries, anti-icing, and flexible electromagnetic interference shielding. The directional migration and dispersion theory of magnetic microparticles in polypropylene (PP)-matrix magnetic composites must be studied to better acquire the functional surface with remarkable features. In this work, a novel simulation model based on multi-physical field coupling was suggested to analyze the directed migration and distribution of magnetic ferroferric oxide (Fe3O4) particles in injection molding assisted by an external magnetic field using COMSOL Multiphysics® software. To accurately introduce rheological phenomena of polymer melt into the simulation model, the Carreau model was used. Particle size, magnetic field intensity, melt viscosity, and other parameters impacting particle directional motion were discussed in depth. The directional distribution of particles in the simulation model was properly assessed and confirmed by experiment results. This model provides theoretical support for the control, optimization, and investigation of the injection-molding process control of surface-functionalized polymer composites.
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