电磁动态注塑对等规聚丙烯增韧和增强研究

利用普通注射成型和电磁动态注塑机注射成型制备等规聚丙烯试样，并对其进行拉伸强度、冲击强度、差示扫描量热仪（DSC）和广角X射线衍射（WAXD）测试。对动态与稳态注射成型聚丙烯制品的力学性能进行了比较，并结合微观测试结果，深入探讨了制品微观结构与力学性能之间的关系。力学测试结果表明，动态成型制品的拉伸性能和冲击性能比稳态加工条件下都有所提高，尤其是制品冲击性能的提高幅度可以达到40％以上，实现了对制品的同时增强和增韧。DSC和WAXD测试表明，动态成型制品的结晶比稳态制品完善，并且晶粒尺寸也小于稳态制品。经过理论分析，认为结晶情况的改善是制品拉伸强度提高的原因，而晶粒细化则大幅度提高了制品的冲击强度。

Study on Self-Reinforced and Self-Toughed Performances of Isotactic Polypropylene by Dynamic Injection Molding

Samples were made respectively by conventional and dynamic injection molding, and their tensile strength, impact strength, DSC and WAXD were tested. Based on experimental results, their mechanical properties were compared and the relation between mechanical properties and microstructure of them was also explored. The mechanical test resuits show that both tensile and impact strength of dynamic injection molding samples are higher than those of conventional samples. Especially an increase about 40% in impact strength has been achieved with dynamic injection molding. It means that self-reinforced and self-roughed samples can be produced simultaneously by dynamic injection molding. DSC and WAXD results show that dynamic injection samples have greater overall crystallinity and finer crystal grains. It indicates that the reason of higher tensile strength is greater overall crystallinity and the reason of higher impact strength is finer crystal grains.