Abstract
Dynamic rheological measurements were used to monitor the in‐situ polymerization of cyclic butylene terephthalate (CBT) oligomers. The material is a two‐component system where the catalyst was pre‐blended within the CBT oligomers. The in‐situ polymerization of CBT was also investigated under various conditions of temperature using a device that combines ultrasonic and volumetric measurements. From the measurements of sample volume, ultrasonic velocity and attenuation, a dynamic viscosity can be calculated and used to characterize the polymerization process. The results from both the rheological and ultrasonic approaches will be compared and discussed.
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