Green synthesis of novel biocomposites from treated cellulosic fibers and recycled bio-plastic polylactic acid

• Autor(a) principal: Laadila, Mohamed Amine
• Data de Publicação: 2017
• Outros Autores: Hegde, Krishnamoorthy, Rouissi, Tarek, Brar, Satinder Kaur, Galvez, Rosa, Sorelli, Luca, Cheikh, R. B., Paiva, M. C., Abokitse, Kofi
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/52588
• topic: Biocomposite; Cellulosic fiber; Microwave treatment; Enzymatic treatment; Mechanical test; Polylactic acid; Engenharia e Tecnologia::Engenharia dos Materiais; Science & Technology

This study investigated mechanical properties of biocomposites developed from recycled polylactic acid (PLA) from packaging industry and treated cellulosic fibers from pulp and paper solid waste. Microwave and enzymatic treatments were used for extraction and surface modification of hydrophilic cellulosic fibers. Enzymatic treatment was specifically performed for activation of hydroxyl groups and improvement of adhesion between matrix and fibers including controlling the length of cellulosic fibers with size reduction of around 50% (142 and 127 mm for primary and mixed biosolids, respectively) as compared to microwave treatment. Microwave treatment produced cellulosic fibers of 293 and 341 mm, for primary and mixed biosolids, respectively. Mechanical properties of biocomposites with 2% (w/w) of treated cellulosic fibers (Young's Modulus 887.83 MPa with tensile strain at breakpoint of 7.22%, tensile stress at yield 41.35 MPa) was enhanced in comparison to the recycled PLA (Young's Modulus 644.47 ± 30.086 MPa with tensile strain at breakpoint of 6.01 ± 0.83%, tensile stress at yield of 29.49 ± 3.64 MPa). Scanning electron microscopy revealed size reduction of cellulosic fibers. X-ray diffraction and Fourier transform infrared spectroscopy confirmed strong mechanical properties of novel biocomposites.