Lyotropic behavior of polyelectrolyte complex micelles - Laboratoire Charles Coulomb (L2C) Accéder directement au contenu
Communication Dans Un Congrès Année : 2018

Lyotropic behavior of polyelectrolyte complex micelles

Résumé

Upon pH stimulus, double hydrophilic block copolymers form polyion complexes (PIC) in the micellar form. We used PIC micelles as ecofriendly templates for the synthesis of ordered mesoporous materials. The porosity of the final material is revealed by simple inversion of the pH stimulus. Various mesoporous silica materials have been obtained from cubic to lamellar.The control over the structure of the final material is expected to relate to the lyotropic behavior just as observed when micelles of amphiphilic molecules are used as template. However such lyotropic behavior has never been reported for PIC micelles. Moreover the same PIC leads to different structured silica materials depending on the physico-chemical conditions.Using X-rays and light scattering, optical microscopy and osmometry, we establish the equation of state (osmotic pressure vs volume fraction) of a PEO-b-PAA/oligoamine electrostatic complex. Its lyotropic behavior is characterized by a transition of shape at 0.16 w/w and a transition to a lamellar phase at 0.30w/w. The water content of the core of the micelles is addressed from the complete phase diagram of the polyelectrolyte complex in its coacervate form and explains why a single complex leads to porous material of different structure.
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Dates et versions

hal-01942648 , version 1 (03-12-2018)

Identifiants

  • HAL Id : hal-01942648 , version 1

Citer

Mélody Mathonnat, Anthony Phimphachanh, Philippe Dieudonne-George, Martin In, Patrick Lacroix-Desmazes, et al.. Lyotropic behavior of polyelectrolyte complex micelles. APS March Meeting 2018, Mar 2018, Los Angeles, United States. ⟨hal-01942648⟩
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