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Impact fracture surfaces of polylactic acid/sisal fibers (PLA/SF) composites (a); PLA/poly (butylene-adipate-terephthalate)/SF (PLA/PBAT/SF) composites (b–f); PLA/SF/commercial grade multi-epoxy-functionalized styrene-acrylic oligomer (PLA/SF/ADR) composites (A); PLA/PBAT/SF/ADR composites (B–F). 500× magnification.
