A study on a joining mechanism of the inteface between two different polymer in a reaction field which is formed by high-intensity ultrasonic wave

1.研制了熔融类塑料试件的纵向连接系统和非熔融塑料试件的剪切连接系统。研究了一种高效率换能器的装配方法。结果表明，采用小螺距螺杆作为换能器是比较合适的。考虑连接过程的研究分为温升机理和连接机理两个阶段。(1)建立了剪切型振动条件下的温升机理模型。基于该模型进行了仿真研究。因此，温度升高主要是由低频下的摩擦引起的，而在高频下是由粘性引起的。此外，我们还发现，较低的摩擦系数使得连接表面的温升较高。(2)为了阐明连接机理，我们用X射线衍射仪(ESCA)对连接部分的分子结构进行了研究。此外，利用扫描电子显微镜对试件进行了接头强度试验，并对接头强度测试后的断口进行了观察。从这次调查中，我们得出结论，加入机制分为三类。这是新的分子组合互扩散和锚定效应的产物。

1. We made a longitudinal-mode joining system for joining of melting-type plastic specimens and a shear-mode system for non-melting plastic specimens. We also studied the assembling method for a high-efficiency transducer. It was find that usage of fine-pitch screw is suitable for the transducer.2. The study of the consideration of the joining process was divided into two stages of temperature rise mechanism and joining mechanism.(1) The model of the temperature rise mechanism was made under the shear-mode vibration conditions. The simulations, which are based on the model, were carried out. Consequently, the temperature rise is caused mainly by friction at lower frequencies and that is caused by viscosity at the higher frequencies. Moreover, we found that lower friction coefficient of the specimen makes higher temperature rise of the joining surface.(2) In order to clarify the joining mechanism, we investigated the molecule structure of the joined part by means ef X-ray analysis method (ESCA). Furthermore, we carried out the joint strength testing and observations of fractured part of the specimens after joint strength testing by means of SEM equipment. From this investigation, we conclude that the joining mechanism is divided into three categories. these are production of new molecular combination interdiffusion and anchor effect.