Potato-fiber modified thermoplastic starch: Effects of fiber content on material properties and compound characteristics

•Sustainable potato fiber, a biorefinery by-product, as green additive in TPS.•Overall characterization of TPS and fiber modified TPS (Microscopy, SEC, XRD, FTIR, DMTA).•The fiber additive interacts with thermoplastic starch to form an amorphous, hydrophilic network.•Structure-property relationship in TPS has an effect on compound and film characteristics.•Film material with haptic and mechanical properties suitable for industrial applications.