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Article Dans Une Revue Macromolecular Symposia Année : 2014

Design and Viscoelastic Properties of PDMA/Silica Assemblies in Aqueous Media

Résumé

Based on specific interactions taking place between poly(N,N-dimethylacrylamide) [PDMA] and silica nanoparticles, two strategies were used to improve the viscoelastic properties of aqueous formulations. First, PDMA oligomers were grafted onto a non-adsorbing poly(acrylamide-co-sodium acrylate) backbone. With this architecture, the binding process of PDMA side-chains with silica nanoparticles was shown to proceed very similarly to free PDMA chains and to promote the formation of hybrid physical networks. The viscoelastic properties of these systems are controlled by the concentration of inorganic cross-links and the fraction of adsorbing grafts involved in the formation of bridges between particles. An optimum weight ratio between silica and grafts was found for the viscoelastic properties, in agreement with the saturation of silica beads by the PDMA precursor. While the homogeneous formation of such hybrid assemblies remains limited to mixtures involving low polymer concentrations (≤ 2 wt%), we show that homogeneous hybrid networks can be readily prepared by direct polymerization of DMA monomer (≥ 5 wt%), with or without chemical cross-linker, in a suspension of silica nanoparticles. In this case, the specific interactions taking place between the silica filler and the whole polymer network give rise to a very unusual combination of properties where elasticity, dissipation, strength and strain at failure are enhanced simultaneously. While the intrinsic structure of the network can be controlled by the level of chemical cross-linking, physical interactions dominate the dissipation process with a dramatic time dependence of the mechanical properties.

Dates et versions

hal-01550824 , version 1 (29-06-2017)

Identifiants

Citer

Laurence Petit, Linn Carlsson, Séverine Rose, Alba Marcellan, Tetsuharu Narita, et al.. Design and Viscoelastic Properties of PDMA/Silica Assemblies in Aqueous Media. Macromolecular Symposia, 2014, 337 (1), pp.58 - 73. ⟨10.1002/masy.201450307⟩. ⟨hal-01550824⟩
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