Relationship between Interfacial Structure and Mechanical Strength of Thermoplastic Welded Products

Abstract

Molding and welding conditions have a significant influence on the mechanical properties of the thermoplastic welding products. In this paper, we described our investigation of the relationship between the interfacial structure and the mechanical strength of them. Especially, we focused on the weld line of polyamide and the welded interface of poly (phenylene sulfide). Using the N-ARC method (the original photo based observation method) and imaging infrared, the traces of the molten polymer flow and the higher-order structure were analyzed. These results showed that the weld line and the welded interface became the fatal defects for their mechanical properties.