超声功率对聚合物超声熔融塑化的影响

Effect of ultrasonic power on polymer ultrasonic plastification

针对超声塑化过程塑化速率、塑化质量与超声功率密切相关的问题,利用自行开发的聚合物超声塑化实验装置,选择聚甲基丙烯酸甲酯(PMMA)、聚丙烯(PP)和尼龙66(PA66)这3种高聚物材料为研究对象,进行超声功率影响因素实验、超声塑化过程形态演变实验和超声塑化速率影响因素实验研究。研究结果表明:超声功率随工具头压力的增大呈近似于正比例增大,且聚合物样品声阻抗越大,超声功率增大幅度越大;超声功率在超声塑化初始阶段急剧上升,达到最高点后小幅度下降,且结晶性的PA66超声功率下降最慢,最后在聚合物样品完全熔融时达到稳定;超声塑化速率随超声功率的增大而增大。

Considering that plasticizing rate and quality are closely related to ultrasonic power in the process of ultrasonic plasticizing,a new ultrasonic plasticizing experimental device was designed.Using three different types of high polymer material,i.e.PMMA,PP and PA66as the research objects,experiments were conducted to explore the influence of factors on ultrasonic power,ultrasonic plasticizing speed and morphological evolution during ultrasonic plasticizing process.The results show that the ultrasonic power increases with the increase of the pressure of the ultrasonic tool head,and the larger impedance of the polymer sample is,the higher increased amplitude of ultrasonic power becomes.The instantaneous ultrasonic power increases sharply at the early stage of ultrasonic plasticizing,decreases slightly after reaching the peak.The ultrasonic power of crystalline PA66decreases most slowly,finally becomes stable when the polymer samples melt completely.The ultrasonic plasticizing rate increases with the increase of the ultrasonic power.