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Improvement of mechanical and microstructure of Poly(lactic acid) based blends for biomedical applications

Abstract : Poly(lactic acid) (PLA) is the most used bio-based polymer. Its physical, chemical and mechanical properties make it possible to replace petroleum-based polymers for some applications (packaging, medical, textile fiber). However, neat PLA is very stiff and relatively brittle without additives. Hence, its mechanical properties have to be improved and blending with other biopolymers is a promising strategy to achieve this objective. The aim of this work is to design biocompatible polymers compositions achievable by FDM additive manufacturing allowing a compromise between ductility and tensile strength for use in the medical field. We focused on PLA and Poly(ß-hydroxybutyrate) (PHB) blends with a multi-functional epoxy as compatibilizer1 and a plasticizing2 agent. To achieve a compromise between ductility and tensile strength, PLA, PHB, compatibilizer and plasticizer were blended together. Using the DOE method, we obtained a range of mechanical properties (Figure 1 above). The ANalysis Of VAriance (ANOVA) made it possible to establish that the second order polynomial model was significant and thus giving the possibility of optimizing all the mechanical characteristics studied by precisely adjusting the rate of the different components. In practice, the control points of the formulations, independent of those contained in the experimental matrix, do not corroborate the predictive phenomenological model. To understand this difference despite a true predictive model, characterizations of binary system were performed. The corresponding results could establish that, under the same extrusion conditions, PHB did not react with Joncryl®. This was ascribed to the processing conditions of the mixture and solved by increasing the extrusion reaction time and decreasing the processing temperature to avoid PHB degradation. These results could highlight the interest of specific addition stages of components on the mechanical properties of the final material.
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Submitted on : Thursday, June 16, 2022 - 9:16:19 AM
Last modification on : Saturday, June 25, 2022 - 3:04:20 AM

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  • HAL Id : hal-03696509, version 1

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Kubra Buyuksoy-Fekraoui. Improvement of mechanical and microstructure of Poly(lactic acid) based blends for biomedical applications. Balard Chemistry Conference, Jun 2022, Montpellier, France. ⟨hal-03696509⟩

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