Microcrystalline cellulose as reinforcing agent in silicone elastomers. (20th October 2016)

• Record Type: Journal Article
• Authors: Deng, S.; Binauld, S.; Mangiante, G.; Frances, J.M.; Charlot, A.; Bernard, J.; Zhou, X.; Fleury, E.
• Is Part Of: Carbohydrate polymers. Volume 151(2016)
• Page Start: 899
• Page End: 906
• Publication Date: 2016-10-20
• Subjects: Microcrystalline cellulose -- Silicone elastomer -- Biohybrids -- Alkyne modification; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2016.06.035
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Modification of microcrystalline cellulose with propargyl bromide. Alkyne functions at the surface of MCC fibers improved the interfacial adhesion between cellulose fillers and the silicone matrix. Enhancement of mechanical and thermal properties when silicone elastomers are filled with MCC-Alkyne. Abstract: Cellulose is commonly used as filler for the reinforcement of polymer materials but data in the case of silicones remain rare. In this work we report the modification of microcrystalline cellulose (MCC) fibers from cotton linters by propargyl bromide, in aqueous medium without alteration of the crystalline domains. The analysis evidenced the efficient grafting of alkyne functions at the surface of the fibers, the DS being 0.5. The resulting MCC-Alkyne fibers were introduced within a bi-component reactive silicone formulation (up to 20 wt%), allowing the formation of network through hydrosilylation reaction in which MCC-Alkyne played the role of a reactive fillers. Comparison between the properties of composites prepared with unmodified MCC and MCC-Alkyne highlighted a densification of the network and an enhancement of mechanical and thermal properties when coupling reactions occurred. Mechanical properties of silicone elastomers were better if the load of MCC-Alkyne remains low.