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Mechanical Properties of End-crosslinked Entangled Polymer Networks using Sliplink Brownian Dynamics Simulations 
Auteur(s): Oberdisse J., Ianniruberto Giovanni, Greco Francesco, Marrucci Guiseppe
(Article) Publié:
Rheologica Acta, vol. 46 p.95-109 (2006)
Texte intégral en Openaccess : 
Ref HAL: hal-00019328_v1
Ref Arxiv: cond-mat/0602462
DOI: 10.1007/s00397-006-0096-0
WoS: 000242407400009
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
17 Citations
Résumé: The mechanical properties of a polymeric network containing both crosslinks and sliplinks (entanglements) are studied using a multi-chain Brownian dynamics simulation. We coarse-grain at the level of chain segments connecting consecutive nodes (cross- or sliplinks), with particular attention to the Gaussian statistics of the network. Affine displacement of nodes is not imposed: their displacement as well as sliding of monomers through sliplinks is governed by force balances. The simulation results of stress in uniaxial extension and the full stress tensor in simple shear including the (non-zero) second normal stress difference are presented for monodisperse chains with up to 18 entanglements between two crosslinks. The cases of two different force laws of the subchains (Gaussian chains and chains with finite extensibility) for two different numbers of monomers in a subchain (no = 50 and no = 100) are examined. It is shown that the additivity assumption of slip- and crosslink contribution holds for sufficiently long chains with two or more entanglements, and that it can be used to construct the strain response of a network of infinitely long chains. An important consequence is that the contribution of sliplinks to the small-strain shear modulus is about ⅔ of the contribution of a crosslink.
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Aggregation of colloidal nanoparticles in polymer matrices
Auteur(s): Oberdisse J.
(Article) Publié:
Soft Matter, vol. 2 p.29-36 (2005)
Texte intégral en Openaccess :
Ref HAL: hal-00012293_v1
Ref Arxiv: cond-mat/0510502
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: Some of our recent studies of the structure and mechanical properties of a special type of nanocomposite are reviewed here. In silica-latex systems, a latex film with silica inclusions is formed from a colloidal solution of both components. During drying of the solution, the formation of silica domains can be controlled via the physico-chemical properties of the solution. Well-defined silica aggregates embedded in a polymer matrix can be generated, and the mechanical properties of the resulting nanocomposite have been shown to be directly correlated to the average structure.
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Detailled structural observation of nanografting chemistry with neutron scattering
Auteur(s): Carrot G., El Harrak A., Oberdisse J., Jestin J., Boue F.
(Article) Publié:
Soft Matter, vol. 2 p.1043-1047 (2006)
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Collective rearrangement at the onset of flow of a polycrystalline hexagonal columnar phase
Auteur(s): Bauer T., Oberdisse J., Ramos L.
(Article) Publié:
Physical Review Letters, vol. 97 p.258303 (2006)
Résumé: Creep experiments on polycrystalline surfactant hexagonal columnar phases show a power law regime, followed by a drastic fluidization before reaching a final stationary flow. The scaling of the fluidization time with the shear modulus of the sample and stress applied suggests that the onset of flow involves a bulk reorganization of the material. This is confirmed by x-ray scattering under stress coupled to in situ rheology experiments, which show a collective reorientation of all crystallites at the onset of flow. The analogy with the fracture of heterogeneous materials is discussed.
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Structure of silica aggregates in a soft polymeric matrix
Auteur(s): Oberdisse J.
Conference: Millenium symposium and european user meeting (Grenoble, France, FR, 2006-04-27)
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Structure Analysis of Nanocomposites by Scattering and Reverse Monte Carlo Simulations
Auteur(s): Oberdisse J.
Conference: Softcomp Network Area Meeting (NA4) and workshop on Confinement universal Aspect in Soft Matter (San Sebastian, Spain, FR, 2006-11-12)
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Functionalized self assembled systems
Auteur(s): Oberdisse J.
Conference: Functional Nanosystems (Berlin, Germany, FR, 2006-06-01)
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