Reactive Processing Techniques in Polymer Extrusion
Summary
Reactive processing in polymer extrusion harnesses the extruder as a continuous reactor, enabling in situ chemical modification of polymers while they are conveyed and melted. By integrating compounding, functionalisation and reactive compatibilisation within a single step, this approach can achieve grafting, crosslinking, chain extension or polymerisation under controlled shear and thermal conditions. Corotating twin-screw extruders are widely employed for their superior distributive and dispersive mixing, precise residence time control and modular screw elements. Key challenges include balancing reaction kinetics against residence time distribution, managing thermal stability of sensitive reactants and achieving uniform conversion without degradation. Advances in real-time monitoring, screw design and modelling have improved control over reaction pathways, leading to novel materials such as compatibilised polymer blends, biodegradable composites and nanostructured interfaces. Reactive extrusion plays a vital role in sustainable processing by reducing solvent use, minimising energy consumption and enabling high-throughput manufacture of functional polymers for packaging, automotive, biomedical and recycling applications.
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Reactive Processing Techniques in Polymer Extrusion publication trend
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Technical terms
Reactive extrusion: Continuous processing technique combining melt compounding with chemical reaction inside an extruder.
Twin-screw extruder: Extruder type with two intermeshing screws providing enhanced mixing and controlled residence time.
Compatibiliser: Additive that promotes interfacial adhesion between polymer phases during reactive processing.
Residence time distribution: Spread of material dwell times within the extruder, affecting reaction conversion and homogeneity.
Dispersive mixing: Action that breaks down agglomerates and phases under high shear.
References
- Experimental and modelling aspects of the reactive extrusion process. Mechanics & Industry (2019).
- On the Data-Driven Modeling of Reactive Extrusion. Fluids (2020).
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