Ulva spp. Casting and melt compounding films_Data
This study investigates the valorisation of Ulva spp. biomass after Autohydrolysis (AH) extraction performed at 120–200 °C as feedstock for biopolymer films, providing the first comparative assessment of casting and melt-compounding techniques. Compositional analysis confirmed that the biomass conta...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | conjunto de datos |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/406968 |
| Acceso en línea: | http://hdl.handle.net/10261/406968 https://doi.org/10.20350/digitalCSIC/17743 |
| Access Level: | acceso abierto |
| Palabra clave: | Autohydrolysis Bio-based films Food packaging Green seaweed Revalorization Waste food packaging seaweeds wastes |
| Sumario: | This study investigates the valorisation of Ulva spp. biomass after Autohydrolysis (AH) extraction performed at 120–200 °C as feedstock for biopolymer films, providing the first comparative assessment of casting and melt-compounding techniques. Compositional analysis confirmed that the biomass contained carbohydrates (27–36 %, with 4–24 % of cellulose), proteins (11–26 %) and ashes (10–42 %). The seaweed biomass also contained phenolic compounds (12–64 mg Gallic Acid Equivalents (GAE)/g sample), which exhibited antioxidant properties (5–11 mg Trolox Equivalent Antioxidant Capacity (TEAC)/g sample). Lower molecular weights were observed with increasing AH temperature, indicating partial depolymerization of the macromolecules. Films were characterized using Fourier Transform Infrared Spectroscopy (FT-IR), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), and X-Ray Diffraction (XRD), together with mechanical and water-barrier properties. The casting method produced continuous, slightly transparent films with Internal Transmittance (Ti) values of 1–40 %, higher stiffness (Young's Modulus, E: 399.83–1852.85 MPa), lower flexibility (Elongation at Break, ɛb: 1.34–12.28 %), low Water Vapor Permeability (WVP: 1.53–2.28 × 10−10 g m·Pa−1·s−1·m−2) and moderate hydrophilicity (contact angle: 57.95°–65.60°). Melt-compounding films were opaque, more homogeneous films with lower stiffness but, in some cases, greater extensibility (ɛb: 1.31–13.33 %), higher WVP (7.31–9.12 × 10−10 g m·Pa−1·s−1·m−2) and increased hydrophilicity (contact angle: 23–44°). Thermal–mechanical processing also influenced molecular organization and the distribution of hydrophilic groups. Overall, this study demonstrates, for the first time, that AH residues derived from Ulva spp. can be transformed into bio-based films with tunable structural, mechanical, and barrier properties. |
|---|