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The digital photograph of the synthesized polyurethane foam (a) and MWPU foam (b); SEM photographs of the surface of the PU foam (P6) (c) and pine wood-based MWPU foams with different content of MP fillers: 0 wt% (d), 5 wt% (e) 7.5 wt% (f), 10 wt% (g) [100].
