Study on the novel ultrasonic weld properties of heterogeneous polymers between PC and PMMA

According to our proposed weld method and apparatus, the welding conditions and strengths between heterogeneous materials of polymethyl-methacrylate (PMMA) and ductile polycarbonate (PC) have been studied. The functional gradient interposed sheet (IPS) prepared from three layers is valid for weld according to its excellent mechanics properties. Excessively long welding time has brought IPS cracking and air bubbles at local part of interfaces. Weld under higher welding stress can enlarge the welding areas and remove air bubbles so as to enhance the strength. Therefore, enlarging welding areas and reducing the air bubbles are very important to improve the welding strengths. The effective welding conditions are the shorter welding time and higher welding stress. According to our study, the novel welding method is effective for heterogeneous materials weld. (C) 2010 Elsevier Ltd. All rights reserved.