Impact of PLA Poly(Lactic Acid) and PBAT Poly(butylene adipate-co-terephthalate) Coating on the Properties of Composites
- PDF / 1,280,495 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 41 Downloads / 202 Views
BRIEF COMMUNICATION
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 Jordana Corralo Spada1 · Sabrina Ferreira Seibert1 · Isabel Cristina Tessaro1 Accepted: 29 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract 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 confirmed by the iodine test. The modulus of elasticity and deflection were not influenced 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. Keywords Composites · Cassava starch · Rice husk · PLA · PBAT · Coating
Introduction Polymers from non-renewable sources are used in many applications because of their resistance, durability, availability, processing facility and low cost. However, this kind of materials usually brings serious problems to the environment due to its non-biodegradability and failures in recycling collection. So, the development of environmentally friendly materials to substitute the plastics based on petroleum has intensified. Among the vegetable raw materials, starch has received special attention for being an abundant resource of low cost with capacity to produce films, foams and composites [1–6]. However, in general, the materials based on starch show poor mechanical properties and low resistance to water when compared to that with conventional plastics obtained from petroleum. To improve the properties of some polymers, the use of filler as reinforcement in composites was evidenced in the last decade because of their * Jordana Corralo Spada [email protected] 1
Department of Chemical Engineering, Federal University of Rio Grande do Sul (UFRGS), Ramiro Barcelos Street, 2777, Porto Alegre, RS 90035‑007, Brazil
high performance in terms of good mechanical properties, chemical resistance and low cost [7–12]. Currently, the use of natural fibers from agroindustrial residues that besides being underused, are generally not properly disposed in the environment has attracted much attention in recent years [13–18]. Several authors have reported the addition of natural fibers or agroindustrial residuals in composites based on starch in different solid basis percentage, as follow: 10% of eucalyptus cellulosic fibers [9]; 10% of wheat straw, hemp, cotton linter or cellulose fibers [19]; 10–20% of sugarcane bagasse [13], 5–20% of mal
Data Loading...
