| Grant number: | 12/13445-8 |
| Support Opportunities: | Regular Research Grants |
| Start date: | November 01, 2012 |
| End date: | October 31, 2014 |
| Field of knowledge: | Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials |
| Principal Investigator: | Derval dos Santos Rosa |
| Grantee: | Derval dos Santos Rosa |
| Host Institution: | Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas (CECS). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil |
| Associated researchers: | Carlos Henrique Scuracchio ; Celso Luis de Carvalho ; Hamilton Magalhães Viana ; Jose Fernando Queiruga Rey ; Maria Ines Bruno Tavares |
Abstract
The use of composites based biopolymers has grown a lot, among other factors, by environmental demands. Among the polymers used, poly (lactic acid) (PLA) has been one of the most studied by its wide applicability. Many composites exhibit deterioration in their mechanical properties when compared with the pure matrix, but the use of mineral fillers has improved some important properties, such as gas barrier, mechanical strength and thermal properties (characteristics important for food applications). This project aims to prepare, by means of extrusion, PLA composites containing different concentrations of exfoliated montmorillonite treated with functionalized organic compound and thermoplastic starch (TPS). Specimens of pure samples and mixtures thereof are prepared by extrusion followed by injection molding. The nanoclay and various prepared compositions will be characterized by X-ray diffraction, X-ray scattering (WAXS / SAXS) and Fourier Transform infrared spectroscopy (FTIR). Another objective is to evaluate the formulations by mechanical properties (tensile strength and elongation at break and elasticity modulus), flow index (MFI), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Kinetic experiments will be performed, depending on the temperature and environment [in the presence of esterase enzymes (PLA) and amylase (starch)], in order to map the effect of TPS and montmorillonite in the crystal structure and morphology of materials through the WAXS experiments / SAXS. The biodegradability of the different formulations will be assessed by monitoring the weight loss every 30 days, and the specimens are subjected to aging in simulated soil for 180 days. (AU)
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