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Carine Mangeon

Carine Mangeon

Université Paris Est, France

Title: Novel biobased elastomeric polymer based on semi-interpenetrating Poly(3-hydroxyalkanoate)s and sunflower oil using a trithiol as crosslinking agent

Biography

Biography: Carine Mangeon

Abstract

Poly(3-hydroxyalkanoate)s (PHAs), have been suggested as green substitutes to replace petroleum-based commodity polymer because of their biodegradability, biocompatibility and versatility. Although PHAs are very promising material in the field of eco-friendly plastics, their intrinsic brittleness and narrow processing temperature window limit their range of application. As a consequence, many attempts have been made to develop PHA with better mechanical and thermal properties. In recent years, much attention has been focused on the development of polymeric materials from vegetable oils, a sustainable resource. Their competitive cost, worldwide availability and built-in functionality (ester functions and insaturations) make them attractive to reinforced various types of polymers. In this study, we report a unique approach to toughen PHAs by increasing their elongation at break and enhancing their thermal stability using sunflower oil (SO). The strategy consisted in the synthesis of a biobased semi-interpenetrating (semi-IPNs) network by crossliking sunflower oil and triméthylolpropane tris(3-mercaptopropionate), a trithiol using “click” thiol-ene reactions into linear PHA polymer matrix. This functionalization process that is characterized by high yields, high reaction rate and short reaction time was initiated photochemically by ultraviolet light in the presence of a photoinitiator 2,2-diméthoxy-2-phényl acétophénone (DMPA). The resulting semi-IPNs PHA/SO exhibited excellent flexibility and showed relatively good thermal stability. Mechanical analysis results have shown that semi-IPNs with 30 wt% of crosslinked sunflower oil displayed excellent properties with an increase of the elastic modulus (170 %) as compared to pristine PHA (7 %). Moreover, it has been demonstrated that the thermal stability of the semi-IPNs increased by incorporation sunflower oil into PHA matrix. Moreover, a single glass transition temperature for the semi-IPN containing sunflower oil up to 30% was observed with dynamic mechanical analysis (DMA), which suggested good compatibility between sunflower oil and PHA in the network.