‘Processing-Property Relationships in Melt Processing of Polyamide-Elastane Textile Blends’, published in AppliedChem (MDPI), by Sabrina Bianchi et al., examines how different melt processing conditions affect the structure and performance of recycled polyamide-elastane (PA/EL) textile blends. The study focuses on mechanical recycling through extrusion, analysing how parameters such as temperature, screw type, and speed influence morphology, viscosity, and thermo-mechanical properties of the resulting materials.  

Key takeaways:

• Mechanical recycling via melt processing is a viable alternative to solvent-based methods for PA/EL textile waste, offering lower environmental impact and simpler processing routes.  
• Processing temperature is a critical factor: moderate conditions (around 230 °C) preserve elastane structure, while higher temperatures (around 260 °C) lead to degradation and changes in material behaviour.  
• The addition of elastane improves ductility and impact resistance of polyamide, though it reduces stiffness, indicating a trade-off in material performance. 
• Morphological analysis shows that elastane acts as a dispersed phase within the polyamide matrix, influencing toughness through mechanisms such as crack bridging and energy dissipation.  
• Optimal processing conditions (moderate temperature and appropriate screw design) provide a balanced combination of strength, flexibility, and impact performance.  
• While suitable for applications such as injection-moulded parts or non-critical products, these blends are more aligned with open-loop recycling due to material limitations.  

The study highlights the potential of melt processing as a scalable and efficient approach to recycling mixed-fibre textiles, while also underlining the importance of optimising processing conditions to balance performance and material integrity. For full details, refer to the original publication.

For more details, read the entire research paper on MDPI – Applied Chem website.