Impact of PLA Poly(Lactic Acid) and PBAT Poly(butylene adipate‑co‑terephthalate) coating on the properties of composites with high content of rice husk

• Autor(a) principal: Spada, Jordana Corralo
• Data de Publicação: 2021
• Outros Autores: Seibert, Sabrina Ferreira, Tessaro, Isabel Cristina
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/221259
• topic: Compósitos; Casca de arroz; Revestimento polimérico; Composites; Cassava starch; Rice husk; PLA; PBAT; Coating

Composites with high content of rice husk (80% based on the solids weight) without and with PLA (5%) and PBAT (2.5%) coating were produced and characterized. Thickness, morphology, thermal and mechanical properties, water absorption capacity and hydrophilicity were evaluated. The optical microscopy indicated a more uniform surface after double coating with PLA that was confrmed by the iodine test. The modulus of elasticity and defection were not infuenced by the thin layer of PLA. On the other hand, water absorption capacity decreased with both polymers used as coating, but lower values were reached with PLA. All materials presented hydrophobic character (contact angle higher than 90°) when measured instantly, with a small decreased after 5 min. The samples coated only once with PLA or PBAT showed analogous thermograms to the uncoated composite.