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(a) FESEM micrograph of bilayer film (cross-section) of cassava starch-based films (S) and PLA:PHBV blend films (P). The polyester (P) and starch (S) sheets are marked, as well as the layer interface (dashed line). (b–d) Light microscopy images (40×) of FA crystalline formations onto the PLA surface of bilayers after spraying and drying the compound ethanolic solution.
