Obtenção, caracterização e estudo de biodegradação de blendas de poli (3-hidroxibutirato-co-valerato)/(PHBV) com lignina de bagaço de cana de açucar




The great amount of synthetic polymers discharged every year in the urban solid waste is growing fast and makes difficult to see the future without a global politics to solve this environmental problem. In this way, many groups of researchers are studying solutions that may guarantee a sustainable development, where Man and Environment can live in a good balance. With this principle, the aim of this work was the development of biodegradable blends , using two natural polymers, with potencial to substitute some of those conventional polymers, contributing to the balance Production versus Environment. In this work, we used a natural biomolecule called Lignin, a macromolecule from sugar-cane bagasse that is abundant in tropical countries like Brazil. The other component of the blend was a copolymer of poly(hydroxybutyrate-co-hydroxyvalerate) or PHBV, a natural biodegradable polyester, from polyhydroxyalKanoates? family (PHAs). Blends of Lignin:PHBV were processed in a mechanical mixer and prepared in several percentages (w/w) : (20:80)%, (40:60)%, (50:50)%; (60:40)%; (80:20)% e (0:100) % , respectively. The blend corresponding to (50:50)% was chosen for the studies of mechanical properties for presenting appropriate characteristics for the study, than the other mixtures, being processed in a single screw extruder and injected to obtain ASTM (D 638) specimens for mechanical tests. The samples biodegradation was studied in liquid and solid medium, in the action of Trametes versicolor and Phanerochaete chrysosporium, a kind of fungi. The blend (50%:50%) characterization was done by Infrared spectroscopy (FT-IR), Differential Scanning Calorimetric (DSC), Mechanical Dynamic Analysis (DMA); Scanning Electron Microscopy (SEM), Nuclear Magnetic Resonance of Proton (H-NMR,) elementary analysis and Thermogravimetry. Through the results it may be seen that the material obtained is susceptible to biodegradation by Trametes versicolor and Phanerochaete chrysosporium, a kind of whiterot fungi, and it presents a good potential for application in the engineering field.


lignina macromoleculas polimeros bagaço de cana

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