(527f) Exploring Rapid Solidification in PA66 and PA6 Using Fast Scanning Calorimetry and Beyond

The processing of thermoplastics in injection molding and blow molding typically involves rapid cooling at rates reaching up to 10³ K/s, resulting in solidification under high supercooling conditions. Fast scanning calorimetry (FSC), a cutting-edge calorimetric technique, accommodates high processing rates and broad temperature ranges by utilizing merely a few nanograms of the sample. With the emergence of FSC, the crystallization behavior of numerous thermoplastics has been unveiled. In this study, we enhance the existing capabilities of FSC by integrating it with additional techniques, such as micro-infrared (Micro-IR) spectroscopy and atomic force microscopy (AFM). We will examine the polymorphism and morphological transitions associated with processing conditions in polyamide 66 (PA66), polyamide 6 (PA6), and their blends. Furthermore, we will discuss the impact of undercooling and cooling rates on the final morphology, providing valuable insights into the solidification process.