Abstract
Vulcanized acrylonitrile-butadiene rubber (NBR)/poly (vinyl chloride) (PVC) blends are mainly served as insulation rubber-plastic materials. During manufacturing and use, amounts of waste NBR/PVC materials are produced. However, traditional methods of reusing waste are inappropriate. Herein, we innovatively proposed the utilization of mechanochemistry to induce the conversion of irreversible C–S cross-linked bonds in waste NBR/PVC insulation materials into dynamically reversible vitrimer-like network structures. The vitrimer-like structure endowed mobility to the global molecular chains in NBR/PVC materials. And thus, it was essential for the reclaimed products to eliminate the difference between the residual network within waste NBR/PVC materials and the devulcanized phase, improving the mechanical properties. More interestingly, waste NBR/PVC powder dynamically modified by trimethylsulfoniumiodide (TMSI) restored the ability to mix with other materials via thermal processing. The HNBR + CuSO4 compounds were then blended with the modified NBR/PVC powder to prepare mechanically excellent composites with optimum stress of 14.6 MPa and strain of 481.0%. The continuity of the matrix was critical to the mechanical properties of the recycled products, and solid-state shear milling (S3M) played a crucial role in this process, as characterized by various experiments.
Published Version
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