1. Rearrangement Zone around a Crack Tip in a Double Self-Assembled Transient Network
- Author
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Serge Mora, Laurence Ramos, Guillaume Foyart, Christian Ligoure, Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique et Génie Civil (LMGC), Physique et Mécanique des Milieux Divisés (PMMD), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), and This work has been supported by the French National Research Agency (ANR) under Contract No. ANR-2010-BLAN-0402-1 (F2F)
- Subjects
Length scale ,Materials science ,Polymers and Plastics ,Nucleation ,FOS: Physical sciences ,02 engineering and technology ,Condensed Matter - Soft Condensed Matter ,01 natural sciences ,Micelle ,Viscoelasticity ,[SPI.MAT]Engineering Sciences [physics]/Materials ,Inorganic Chemistry ,mental disorders ,0103 physical sciences ,Materials Chemistry ,010306 general physics ,Ductility ,Birefringence ,[SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment ,Organic Chemistry ,[SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph] ,021001 nanoscience & nanotechnology ,Chemical physics ,Soft Condensed Matter (cond-mat.soft) ,Transient (oscillation) ,Deformation (engineering) ,0210 nano-technology ,[PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] - Abstract
We investigate the nucleation and propagation of cracks in self-assembled viscoelastic fluids, which are made of surfactant micelles reversibly linked by telechelic polymers. The morphology of the micelles can be continuously tuned, from spherical to rod-like to wormlike, thus producing transient double networks when the micelles are sufficiently long and entangled, and transient single networks otherwise. For a single network, we show that cracks nucleate when the sample deformation rate involved is comparable to the relaxation time scale of the network. For a double network, by contrast, significant rearrangements of the micelles occur as a crack nucleates and propagates. We show that birefringence develops at the crack tip over a finite length, $\xi$, which corresponds to the length scale over which micelles alignment occur. We find that $\xi$ is larger for slower cracks, suggesting an increase of ductility., Comment: 10 pages, 4 figures
- Published
- 2016
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