Gel Detection in Polymers Using FT-Rheology

This technical report discusses the detection of gel content in polymers through FT-Rheology utilizing the Large Amplitude Oscillatory Shear (LAOS) technique. It outlines the significance of gel content and long chain branching (LCB) on the viscoelastic properties and processability of filled rubber compounds. The report presents traditional analytical methods for determining gel content, such as filtration and rheological tests, and highlights their limitations. It introduces the advanced FT-Rheology via LAOS technique as an alternative method that quantifies LCB and gel content by analyzing the non-linear response of raw materials. The study validates this approach through case studies involving various elastomer grades, emphasizing the relationship between gel presence and processing behavior. The report also details the impact of gel on mixing behavior, flow properties, and the mechanical characteristics of the final products, providing a comprehensive understanding of the challenges faced in the rubber industry regarding gel content management.