Abstract
In laser transmission welding of thermoplastics, carbon black (CB) is often used to absorb laser energy and to convert it into heat. This process is controlled by the level and dimensions of the CB dispersed in the absorbing polymer. This study presents a technique for quantifying the CB morphology in polyamide 6 (PA6) and polycarbonate (PC) used in laser welding applications. The microstructure of the CB was observed by transmission electron microscopy (TEM). The TEM photomicrographs of CB were quantitatively analyzed using an image processing technique. The microstructural parameters such as size, shape and distribution of CB particles and aggregates were obtained. The results show that number average aggregate diameter was 40 to 100 nm for the materials tested. The number average diameter of the particles making up the aggregates was in the range of 10–30 nm.
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