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Dynamic mechanical characterization of lignin-based vitrimers (PDV-SKL): (a) stress relaxation curves of vitrimers with different lignin contents. (b) Stress relaxation curves of PDV-SKL (1:1) at different temperatures. (c) Fitting of the experimental relaxation times to the Arrhenius equation. (d) Creep-recovery behavior of PVD-SKL (1:1) at 180 °C.
