| The purpose of this study was to determine the suitability of the bond created between polycarbonate and styrenic based thermoplastics, when bonded through a two-shot injection molding process. The study investigated five different styrenic based thermoplastics, each of which was molded onto polycarbonate, forming a double lap joint. The shear strength of the bond between the two materials was then tested by way of a tensile test. The results of these tests were then compared to determine which combinations yielded the strongest bond. From this initial round of testing, the materials with the strongest bond were then further investigated, to determine if the bond strength could be made to exceed the ultimate strength of the pure material. The results showed that a combination of polycarbonate molded onto ABS provided the strongest bond. It was also determined that to some extent, the proximity of the two materials' solubility parameters can be used as a predictor of bond strength. |
