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- W613837306 abstract "This work deals with the structural study of two crosslinked networks: polyurethane (PU) obtained through polyaddition and UV-curable polyurethane acrylate (PUA). In the case of PUs, the molar mass distribution of the poly(propylene oxide) triols is responsible for the non homogeneous structure observed by AFM and viscoelastic analysis. In relation with 1H NMR spin diffusion experiments, we showed the presence of soft, three-dimensional domains having a diameter of 10 to 20 nm, embedded in a rigid matrix resulting from the percolation of topological hard clusters. In the case of PUAs, the polydispersity of the urethane acrylate oligomer - in addition to the formation of microgels arising from the free radical polymerization - allowed us to explain the wide mechanical transition observed. Finally, experiments were carried out, aiming at reducing the shrinkage of acrylate formulations i) by introducing (nano)fillers or ii) by properly selecting the reactive diluents. Furthermore, these last results allowed us to determine the volume shrinkage after polymerization associated with the presence of one mole of double bonds in the liquid formulation" @default.
- W613837306 created "2016-06-24" @default.
- W613837306 creator A5011099555 @default.
- W613837306 date "2007-01-01" @default.
- W613837306 modified "2023-09-27" @default.
- W613837306 title "Comparaison des structures et propriétés de polyuréthanes et polyuréthanes acrylates réticulés : application à l'élaboration de formulations photopolymérisables à propriétés contrôlées pour revêtements épais transparents" @default.
- W613837306 hasPublicationYear "2007" @default.
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