This study explores a novel molding method for thermoset rubber that diverges from traditional techniques. Unlike conventional thermosets, this method-which incorporates various plastic recycling processes-not only retains the high elasticity and superior performance characteristics of thermoset rubber but also offers cost-effective molding and is easily recyclable. Specifically, this research focuses on the compatibilization and modification of dynamically vulcanized natural rubber/linear low-density polyethylene (NR/LLDPE) blends. Utilizing a system comprising a silane coupling agent, glycidyl methacrylate (GMA), styrene, and dicumyl peroxide (DCP)-a multi-monomer "in-situ polymerization" approach-the study investigates the flame-retardant effects of red phosphorus-based additives, as well as the static and dynamic mechanical properties and thermal decomposition behavior of the resulting composites. The results demonstrate excellent overall performance, providing valuable references and practical insights for the further research, development, and application of eco-friendly flame retardants.
During mechanical processing involving shear and extensional flow-specifically during the phase inversion process-it is essential to ensure a uniform degree of thermal decomposition of the raw materials. This uniformity is critical to prevent localized regions from escaping the mixing and shearing forces; otherwise, the final product may suffer from defects such as "specks" or gel formation. Studies on the shear and extensional flow behavior of Thermoplastic Elastomers (TPEs) indicate that materials with similar relative viscosities tend to disperse more effectively. When the capillary number exceeds a certain critical threshold, effective dispersion can be achieved through simple shear flow alone. However, experimental evidence confirms that the incorporation of extensional flow mechanisms leads to even superior dispersion results. These rubber-based materials exhibit high elasticity and strength-characteristic of traditional rubber-while simultaneously possessing the processing advantages of injection molding. Furthermore, they are eco-friendly, non-toxic, and safe; feature a wide range of hardness options; offer excellent colorability and a soft tactile feel; and demonstrate superior weather resistance, fatigue resistance, and thermal stability. Unlike traditional thermosets, they do not require curing and can be recycled-thereby reducing costs-making them highly suitable for applications involving secondary injection molding.