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Improved Mechanical Properties and Structure of Polypropylene Pipe Prepared Under Vibration Force Field

机译：振动力场下聚丙烯管材力学性能和结构的改进

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摘要

The polypropylene (PP) pipes were prepared using a self-made electromagnetic dynamic plasticating extruder, which introduced a vibration force field into the whole plasticating and extrusion process by the axial vibration of the screw. The effects of the vibration frequency and the vibration amplitude on the mechanical properties and microstructure of PP pipes were investigated using bursting pressure testing, tensile testing, impact testing, differential scanning calorimetry (DSC), and wide-angle X-ray diffraction (WAXD). The mechanical properties testing showed that the circumferential strength of PP pipes increased significantly, and the biaxial self-reinforcement pipes could be obtained. Also, the impact strength was improved. When compared with the conventional static extruded specimens, the maximum increase of bursting pressure, tensile yield strength, and impact strength were 27.03%, 7.3%, and 16.2%, respectively. DSC and WAXD analysis showed that the PP pipes obtained by vibration plasticating extrusion (VPE) had higher crystallinity, higher melting temperature, more perfect crystals, and smaller crystal sizes, but no new polymeric crystalline peak appeared. The improvement of mechanical properties of the PP pipes prepared by VPE was attributed to the higher crystallinity and the improvement of the molecular orientation and of the crystalline morphology under the action of the vibration force field.
机译：聚丙烯（PP）管是使用自制的电磁动态塑化挤出机制备的，该挤出机通过螺杆的轴向振动将振动力场引入整个塑化和挤出过程。使用爆破压力测试，拉伸测试，冲击测试，差示扫描量热法（DSC）和广角X射线衍射（WAXD）研究了振动频率和振动幅度对PP管机械性能和微观结构的影响。力学性能测试表明，PP管材的周向强度显着提高，可获得双轴自增强管。另外，冲击强度得到改善。与常规静态挤压试样相比，破裂压力，拉伸屈服强度和冲击强度的最大增加分别为27.03％，7.3％和16.2％。 DSC和WAXD分析表明，通过振动塑化挤出（VPE）获得的PP管具有更高的结晶度，更高的熔融温度，更完美的晶体和更小的晶体尺寸，但是没有出现新的聚合物晶体峰。通过VPE制备的PP管的机械性能的改善归因于较高的结晶度以及在振动力场的作用下分子取向和晶体形态的改善。

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