超声辅助注射成形碳纤维增强聚丙烯制件性能研究  

Study on Properties of Ultrasonic-assisted Injection Molding of Carbon Fiber-reinforced Polypropylene Parts

作　　者：刘莹[1,2] 陈越[1,2] 赵雪利 于同敏 祝铁丽[1,2] LIU Ying;CHEN Yue;ZHAO Xueli;YU Tongmin;ZHU Tieli(Engineering Research Center for Molding Product of Ministry of Education,Dalian University of Technology,Dalian,Liaoning,116024;School of Mechanical Engineering,Dalian University of Technology,Dalian,Liaoning,116024)

机构地区：[1]大连理工大学模塑制品教育部工程研究中心,大连116024 [2]大连理工大学机械工程学院,大连116024

出　　处：《中国机械工程》2023年第16期1975-1981,共7页China Mechanical Engineering

基　　金：国家自然科学基金(51575080,52205339)。

摘　　要：利用自行研制的超声辅助注射成形系统,成形了碳纤维质量分数为20%的增强聚丙烯制件,并借助X射线衍射、扫描电镜观测以及拉伸试验等方法,研究了不同超声功率和模具温度、聚合物熔体温度及注射压力对制件内部的分子凝聚态结构与其力学性能的影响。结果表明,在较高的模具温度、较低的聚合物熔体温度及较小的注射压力下,施加功率600 W的超声振动,能够明显增大聚合物熔体的流动剪切速率,进而提高聚合物分子链和碳纤维的取向程度,促进晶核生成与晶体生长,使制件的拉伸强度得到明显提高。Reinforced polypropylene parts with carbon fiber content of 20% were fabricated by the self-developed ultrasonic-assisted injection molding system.The effects of ultrasonic power,mold temperature,polymer-melt temperature and injection pressure on the molecular condensed state structure and mechanics properties of the polypropylene parts were studied by means of X-ray diffraction,scanning electron microscopy and tensile test.The results show that under the condition of higher mold temperature,lower polymer-melt temperature and lower injection pressure,ultrasonic vibration with power of 600 W may envidently increase the polymer-melt flow shear rate,leading to enhanced orientation of polymer molecular chains and carbon fibers.As a result,nucleation and crystal growth will be promoted,and tensile strength of the polymer parts will be significantly improved.

关 键 词：超声振动 注射成形 碳纤维 凝聚态结构 力学性能 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]