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(a–b) Reflected light (brightfield and polarized illumination) micrographs of PLA/Lignin with 5% lignin (magnification ×100 and ×500). (c–d) Closer examination (×4000 and ×8000 magnification) of the morphology of lignin aggregation with SEM, from the tensile-fractured surface of sample with 15% lignin.
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