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. 针对熔融型塑料试件的连接设计了纵向连接系统，针对非熔融型塑料试件设计了剪切连接系统。研究了一种高效换能器的装配方法。结果表明，采用细螺距螺杆是比较合适的。对连接过程的研究考虑分为温升机理和连接机理两个阶段。(1)建立了剪切模态振动条件下的温升机理模型。基于该模型进行了仿真。因此，温升主要是由低频率的摩擦引起的，而高频率的摩擦是由粘度引起的。试样的摩擦系数越小，接合面温升越高。(2)为了明确连接机理，采用x射线分析方法（ESCA）对连接部位的分子结构进行了研究。此外，我们还利用扫描电镜设备进行了接头强度测试和接头强度测试后试件断裂部分的观察。从调查中，我们得出结论，加入机制分为三类。这是新的分子组合、相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.