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Wide Angle X-ray scattering (WAXS) profiles of (a) the milled cellulose (C), milled walnut shell (WS), and diatomite (D) fillers and of (b) the polyurethane composite foams PUG, PUG-C, PUG-WS and PUG-D. Polarized optical microscopy (POM) images of (c) the PUG-D and of (d) the pristine PUG. The scale bar in the POM images is 50 µm.
