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Preparation and modification of thermoplastic/tannins composites via reactive extrusion

Abstract : Condensed tannins are widely distributed and highly abundant in nature. In the past decades, such tannins have played an important role in thermosetting systems (e.g. adhesives for wood bonding, foam material) because of their chemical reactivity. However, they also exhibit great potential as a component of polymeric materials because of their physicochemical properties (e.g. antioxidant, antimicrobial and stabilizing properties), which are promising for material preparation. In order to transform tannins from traditional application to a broaden application in polymeric materials, the main challenge facing tannins are their incompatibility with hydrophobic polymer. For this purpose, three modification pathways were developed to improve the compatibility of tannins with PP or PLA matrix. In the first part, PP/ tannins were modified with hexamine or glyoxal via dynamic vulcanization technique. After vulcanized extrusion, vulcanized tannins present better compatibility and UV protective performance in PP matrix. The second approach is CTs modified with acetic anhydride. With this method, up to 30 wt% acetylated tannin (AT) can be well incorporated with PLA while PLA containing up to 20 wt% AT did not deteriorate the mechanical property and surface morphology. This PLA/AT composites are printable via fused deposition modeling process. In the third part, the efficient reactive compatibilization have been successful used to improve the interfacial adhesion between PLA and CTs by using 3-aminopropytriethoxysilane, methylene diphenyl diisocyanate, and dicumyl peroxide (DCP).
File URL :
http://docnum.univ-lorraine.fr/ulprive/DDOC_T_2019_0071_LIAO.pdf
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https://hal.univ-lorraine.fr/tel-02349196
Contributor : Thèses Ul <>
Submitted on : Tuesday, November 5, 2019 - 3:35:35 PM
Last modification on : Monday, February 17, 2020 - 11:59:34 AM

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  • HAL Id : tel-02349196, version 1

Citation

Jingjing Liao. Preparation and modification of thermoplastic/tannins composites via reactive extrusion. Polymers. Université de Lorraine, 2019. English. ⟨NNT : 2019LORR0071⟩. ⟨tel-02349196⟩

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