Processing and characterization of composites of poly(3-hydroxybutyrate-co-hydroxyvalerate) and lignin from sugar cane bagasse

A biodegradable polymer composite containing lignin from sugarcane bagasse and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was produced and characterized in terms of its thermal, morphological, and mechanical properties. for comparison with the properties of the composites, the properties of the isolated composite components (lignin and PHBV) were also determined. the characterizations were carried out by Fourier transformed infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and mechanical properties. in the micrograph images, no physical contact between filler and matrix was verified. the thermal decomposition profiles of composites depend on the lignin/PHBV proportions, and their residual mass increased as a function of lignin amount. Higher temperatures were necessary to promote PHBV crystallization in the presence of lignin. However, the crystalline degree of composites was not affected by the lignin. the results obtained in the mechanical tests showed that the lignin addition caused a decrease of mechanical properties.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)PronexConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP, BrazilUniv Estadual Campinas, Fac Chem Engn, BR-13083970 Campinas, SP, BrazilUniversidade Federal de São Paulo, Inst Sci & Technol, BR-12231280 Sao Jose Dos Campos, SP, BrazilUniv Metodista Piracicaba, Lab Carbonaceous Mat, Piracicaba, SP, BrazilUniversidade Federal de São Paulo, Inst Sci & Technol, BR-12231280 Sao Jose Dos Campos, SP, BrazilWeb of Scienc