Étude d'élaboration des mélanges de matériaux bio-sourcés à base d'amidon plastifié et de poly (acide lactique) et de leur compatibilisation

Abstract : This study dealt with the development and the compatibilization of the blends of plasticized starch and polylactic acid. The transformation of native to plasticized starch is possible by extrusion in the presence of plasticizers. In this work, the final properties of plasticized starch are controlled by changing process parameters (temperature, extrusion time, screw's rotation speed) and nature and quantity of plasticizers. Plasticization of starch by water, glycerol, sorbitol and citric acid is studied. The blends of plasticized starch and poly (lactic acid) (PLA) are prepared and characterized in the second part of this work. To improve the compatibility of the blend, one way is the addition of a copolymer to the mixture to stabilize the dispersed phase in the matrix. The copolymer used in this work (Amylose-g-PLA) is constituted of amylose backbone and poly (lactic acid) (PLA) grafts. The number and the size of the grafted chains of PLA have been controlled by a three step process polymerization. Two copolymer structures have been prepared: type1, containing high numbers of low molar weight PLA grafts and type 2, lower numbers of high molar weight PLA grafts. In the final part, efficiency of these copolymers (Amylose-g-PLA) in these blends is studied. The comparison between morphology and mechanical properties of blends prepared with these copolymers, demonstrate the higher efficiency of type1 copolymer
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Sara Ronasi. Étude d'élaboration des mélanges de matériaux bio-sourcés à base d'amidon plastifié et de poly (acide lactique) et de leur compatibilisation. Alimentation et Nutrition. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0264⟩. ⟨tel-01749458⟩

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