Article Dans Une Revue Molecules Année : 2023

Influence of Block-Copolymers’ Composition as Compatibilizers for Epoxy/Silicone Blends

Impact de la structure des copolymères blocs sur la compatibilisation des réseaux époxy/silicone

Résumé

The objective of this study was to prepare crosslinked epoxy networks containing liquid silicone particles in order to improve their mechanical properties and obtain less brittle materials. Different copolymers were used as compatibilizers. These copolymers vary in their chemical composition and structure. All of the copolymers contain hydrophobic (PDMS sequences) and hydrophilic groups. The effect of their chemical structure and architecture on the morphology of the dispersed phase, and on the final physico-chemical and flexural characteristics of epoxy/silicone blends, was explored. The morphology of crosslinked formulations was studied by scanning electron microscopy (SEM), and the thermal characteristics (glass transition temperature, Tg, and curing exothermic peak) were determined by differential scanning calorimetry (DSC). The experimental results have shown that the average diameter and particle size distribution of silicone particles depend on the chemical structure and architecture of the compatibilizers. One copolymer has been identified as the best compatibilizer, allowing a lower mean diameter and particle size distribution in addition to the best mechanical properties of the final network (less brittle character). This study has consequently evidenced the possibility of creating in situ silicone capsules inside an epoxy network by adding tailored compatibilizers to epoxy/silicone formulations.

Cette étude explore comment la structure chimique et architecturale de copolymères spécifiques contrôle la formation in situ de capsules de silicone dans des réseaux époxy. En jouant sur l’équilibre entre blocs hydrophiles et hydrophobes (PDMS), nous avons analysé leur impact sur la morphologie de la phase dispersée, ainsi que sur les propriétés mécaniques et thermiques des matériaux. Nos résultats confirment que la structure chimique des copolymères est un levier clé pour ajuster finement la microstructure et améliorer la résistance des réseaux, ouvrant la voie à des formulations époxy/silicone mieux maîtrisées et moins fragiles.

Dates et versions

hal-04256696 , version 1 (24-10-2023)

Identifiants

Citer

Christelle Delaite, Sophie Bistac, Daniela Rusu. Influence of Block-Copolymers’ Composition as Compatibilizers for Epoxy/Silicone Blends. Molecules, 2023, 28 (17), pp.6300. ⟨10.3390/molecules28176300⟩. ⟨hal-04256696⟩
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