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Our study aims to investigate the behavior induced by multiple injections molding cycles on the properties of olive husk flour reinforced poly lactic acid composites. The effect of the chemical treatment was studied. Biocomposite compounds (20wt% of OHF) are manufactured by twin-screw extrusion. Then, multiple injections and grinding cycles were performed (up to 8 cycles) to obtain normalized samples. Mechanical properties were performed at a macro-scale using tensile tests. The results show that the Young modulus of the composites has slightly decreased with the number of cycles and a slight reduction in the elongation at break was noticed. [ABSTRACT FROM AUTHOR]

Stretch blow moulding process has been used for the manufacture of bioresorbable vascular scaffold (BVS) made by poly (l-lactic acid) (PLLA) to improve its mechanical performance. In order to better understand the process, thermomechanical properties of PLLA were investigated by experimental method. Extruded PLLA sheets were biaxial stretched under strain rate of 1s-1, 4s-1 and 16s-1 to simulate the deformation process applicable in the blow moulding process. Both the equal-biaxial stretch and constant-width stretch were conducted by an in-house developed equipment. By differential scanning calorimeter (DSC), thermal analysis for materials before and after stretch were compared to evaluate the microstructural change of PLLA materials in the deformation process. A constitutive model based on glass rubber model was presented to simulate the mechanical behaviour of PLLA above glass transition under biaxial deformation. [ABSTRACT FROM AUTHOR]