工程领域中的结霜现象引起高能耗和安全问题，采用超疏水聚合物微纳结构表面与光热材料相结合的策略抗结霜效果显著，对能源有效利用具有重要意义。高效构筑具微纳结构和高光热转换效率功能的超疏水聚合物表面是防除霜的关键技术。为此，本项目自行设计制备具有微纳结构的阳极氧化铝模板，以聚丙烯基磁性复合材料为载体，研究外磁场下多层次微纳结构的微注塑成型机理；研究不同外磁场强度大小和方向对熔体剪切粘度的影响，建立外磁场下熔体填充微纳型腔的流变力学模型；探索外磁场和剪切速率协同作用对熔体微纳型腔的填充和结晶行为、填料的取向和迁移行为的影响规律，探寻填料取向和定向分布状态对结晶度的影响规律，实现多层次表面微纳结构和磁性填料取向分布的调控；揭示填料取向和定向分布状态对光热转换效率的影响规律。项目研究将为聚合物多层次微纳结构的设计和制备工艺提供新思路，并促进聚合物表面防除霜和微注塑成型技术的发展，具有重大理论意义。

The frosting phenomenon in engineering fields causes high energy consumption and safety issues. The superhydrophobic micro-/nanostructured polymer surfaces combined with photothermal materials have a significant anti-frosting effect and are of great significance for the use of energy in an effective way. An efficient architecture of superhydrophobic polymer surfaces with micro-/nanostructure and high photothermal conversion efficiency is the key technology for anti-frosting and defrosting. Therefore, this project designed and prepared the micro-/nanostructured anodic aluminum oxide template, and took the polypropylene-based magnetic composite as a carrier to study the microinjection molding mechanism of hierarchical micro-/nanostructure under external magnetic field; the influence of strength and direction of different external magnetic fields on the melt of shear viscosity was studied, and a rheological mechanical model for melt filling a micro-/nano cavity under external magnetic field was established; the synergistic effect of external magnetic field and shear rate on the melt filling and crystallization behavior in the micro-nano cavity, and the influence rule of orientation and migration behavior of fillers were explored. The influence rule of filler orientation and directional distribution on crystallinity was explored, and the manipulation of hierarchical surface micro-/nanostructure and magnetic filler orientation distribution was realized; and the influence rule of filler orientation and directional distribution on photothermal conversion efficiency was revealed. The project research will provide new ideas for the design and preparation process of polymer hierarchical micro-/nanostructures, and promote the development of polymer surface anti-frosting, defrosting, and microinjection molding technology, which has great theoretical significance.