超声波对UHMWPE/PP加工及力学性能的影响  

Effect of ultrasonic wave on processability and mechanical properties of UHMWPE/PP

作　　者：罗佳[1] 刘亚青[1] 付一政[1] 谢江波[1] 

机构地区：[1]中北大学山西省高分子复合材料工程技术研究中心,山西太原030051

出　　处：《合成树脂及塑料》2009年第1期57-59,67,共4页China Synthetic Resin and Plastics

摘　　要：研究了超高相对分子质量聚乙烯/聚丙烯在超声波作用下的挤出加工特性和力学性能。实验发现,在施加超声波后,表观黏度有所降低,且超声波功率越大,作用时间越长,降低的幅度越大,同时,其表观质量有所改善。在适当的超声波功率作用下,挤出物的拉伸强度提高幅度最大为3.32%,冲击强度提高幅度达12.72%。而当超声波功率过大时,会出现大分子降解现象,其力学性能反而下降。X射线衍射分析显示,超声波的加入使其结晶度下降,晶粒尺寸变小。This paper studied the extrusion-processability and mechanical properties of the blending system consisting of ultrahigh relative molecular weight polyethylene （UHMWPE） and polypropylene （PP） under the action of ultrasonic wave. The experiments indicate that exerting ultrasonic wave brings about a significant reduction in apparent viscosity; the higher the ultrasonic intensity and the longer the response time, the larger the magnitude of the reduction, whereas the appearance quality of the UHMWPE/PP blend is improved to a certain extent. The maximum increment in tensile strength and impact strength of the extrudate reaches 3.32% and 12.72%, respectively, due to the action of ultrasonic wave with an＇ appropriate intensity. The phenomenon of macromolecule degradation occurs in case the ultrasonic intensity is overhigh, thereby the mechanical properties of the UHMWPE/ PP blend decrease. The X-ray diffraction analysis verifies that the irradiation of ultrasonic wave make the crystallinity and crystal dimension of UHMWPE/PP lower.

关 键 词：超高相对分子质量聚乙烯 聚丙烯 超声波 流变 力学性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]