脉动拉伸应力对聚丙烯玻璃纤维片材结构与性能的影响  

Effect of Pulsating Elongation Stress on Structure and Properties of Polypropylene Glass Fiber Sheet

作　　者：殷小春 夏天 何光建 冯彦洪 Xiaochun Yin;Tian Xia;Guangjian He;Yanhong Feng(Key Laboratory of Polymer Processing Engineering of Ministry of Education,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学聚合物成型加工工程教育部重点实验室,广东广州510640

出　　处：《高分子材料科学与工程》2024年第12期71-77,共7页Polymer Materials Science & Engineering

摘　　要：基于输运空间容积的周期性变化产生脉动拉伸应力的原理研制了叶片式熔体脉动泵送装置,将脉动变化的拉伸-压缩应力作用于聚丙烯/玻璃纤维熔体以实现复合片材的增强挤出,实验研究了脉动泵送装置转轴转速对片材微观结构和宏观力学性能的影响。结果表明,脉动泵送装置对玻纤的分散及沿挤出方向的取向均有促进作用,所制片材沿挤出方向拉伸强度随转速的提高先升后降,在泵送转速为30 r/min时达到最大值42.64 MPa,较直接挤出片材(30.92MPa)提高了37.9%。表明叶片式熔体脉动泵送装置对玻纤填料增强聚丙烯体系具有适用性,为PP/GF的增强提供了有效途径。A vane type melt pulsating pumping device was developed based on the principle that the periodic change of transport space volume produces pulsating elongation stress.The pulsating elongation-compression stress was applied to polypropylene/glass fiber melt to achieve sheet reinforcement extrusion.The effects of the rotating speed of the pulsating pump shaft on the microstructure and macroscopic mechanical properties of sheet were investigated experimentally.The results show that the pulsating pumping device can promote the dispersion and orientation of glass fiber along the extrusion direction.The tensile strength of glass fiber along the extrusion direction increases first and then decreases with the increase of rotating speed,and reaches the maximum value of 42.64 MPa at the pumping speed of 30 r/min,which is 37.9%higher than that of the directly extruded sheet(30.92 MPa).The results show that the vane type melt pulsating pumping device is suitable for glass fiber(GF)filler reinforced polypropylene(PP)system,and provides an effective way for PP/GF strengthening.

关 键 词：脉动拉伸应力 玻璃纤维取向 复合片材 拉伸强度 

分 类 号：TQ327.1[化学工程—合成树脂塑料工业]