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Article Dans Une Revue Macromolecular Reaction Engineering Année : 2022

New Reactive Formulations For Polypropylene Foams

Résumé

This work focuses on reactive extrusion to design polypropylene (PP) chains with long and short branching to obtain non-linear behavior for the synthesis of low-density foams (<100 kg m −3) using a batch supercritical carbon dioxide (scCO 2) foaming process. From a maleic anhydride (MA) grafted PP (PP-g-MA), the long-branched chains are performed using [MA]/ [OH] reaction (with Sorbitol alcohol). On the other hand, short branched chains are made from the hydrolysis/condensation of amino-alkoxysilane (3-Aminopropyl-triethoxysilane, APTES) in situ grafted onto PP chains through the ([MA]/NH 2 ] reaction). The results show the need to combine both systems to reach the optimum of the rheological behavior (linear and non-linear) to obtain a low-density foam. On the other hand, the foaming behavior of polypropylene/polyamide 6 (PP/PA6) polymer blends at T = 180 °C is also investigated as another way to control the rheology and foamy behavior. At this temperature, T = 180 °C, the PA6 phase behaves as solid dispersed particles in a viscoelastic liquid PP matrix. Finally, this study shows the influence of PA6 concentration on the foaming and foam morphology correlated to a rheological study (shear and extensional) and mechanical compressive properties.

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Polymères
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Dates et versions

hal-03857561 , version 1 (21-11-2022)

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Benoit Rainglet, Lucas Verron, Yvan Chalamet, Véronique Bounor-Legaré, Karim Delage, et al.. New Reactive Formulations For Polypropylene Foams. Macromolecular Reaction Engineering, In press, pp.2200004. ⟨10.1002/mren.202200004⟩. ⟨hal-03857561⟩
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