SABIC has pioneered the development of a novel class of functionalized polyolefins (IRF-PO) produced using patented catalytic in-reactor technology. This study focuses on the application of low crystalline hydroxyl-functionalized propylene-based terpolymers as advanced polymer compatibilizers in bitumen modification. The IRF-PO technology introduces polarity into apolar polymers, facilitating strong interactions between bitumen’s apolar and polar components,
as well as mineral aggregates used in asphalt mixture production. These interactions form a thermoreversible cross-linked network, enhancing the mechanical integrity, adhesive strength, and processability of polymer-modified bitumen across service and high-application temperatures.
A key feature of IRF-PO is its ability to stabilize crumb rubber (CR) in bitumen compared to conventional compatibilizers without significantly increasing viscosity, thereby reducing processing costs. The hybrid modified bitumen exhibits excellent rheological properties, stability during storage and transport, and improved morphology, as evidenced by fluorescence microscopy studies. These improvements stem from uniform polar constituent distribution and reduced interfacial energy, resulting in a more cohesive and compatible binder of enhanced functional performance. Furthermore, the IRF-PO enhances rutting resistance and cohesive strength, yielding superior performance in the final asphalt products. The elastic network formed between the compatibilizer, recycled polymer, and bitumen components highlights the high compatibility and efficiency of IRF-PO technology.
This research contributes to the development of sustainable and cost-efficient asphalt modification technologies, implemented in collaboration with SABIC B.V., Saudi Aramco,
and Road General Authority of Saudi Arabia aiming to revolutionize the integration of challenging polymer waste streams into eco-friendly infrastructure solutions.