Phase behavior of ionic block copolymers studied by a minimal lattice model with short-range interactions
Knychała P.1,5, Dziȩcielski M.1, Banaszak M.1, Balsara N. P.2,3,4
- 1Faculty of Physics, A. Mickiewicz University, ul. Umultowska 85, 61-614 Poznan, Poland
- 2Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
- 3Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
- 4Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, United States
- 5Higher Vocational State School in Kalisz, ul. Nowy Świat 4, Kalisz, Poland
Macromolecules, 46 (14), pp.5724-5730, 2013
DOI:: 10.1021/ma400078y
Abstract:
We present the results of Monte Carlo lattice simulations of a model symmetric diblock copolymer wherein a fraction of segments of one block, p, corresponds to ionic species, and the other block does not contain ions. We use experimentally determined Flory-Huggins interaction parameters, χ, to quantify the interactions between ionic and nonionic monomers. Analysis of the experimental data indicate that χ between poly(styrenesulfonate) and polystyrene is about 5, a value that is orders of magnitude larger than that obtained in mixtures of nonionic polymers. Our model predicts that clustering of ionic monomers in the disordered state results in stabilization of the disordered phase and the product p2χN is well above the mean-field value of 10.5 at the order-disorder transition (N is the total number of monomers per chain). Network morphologies and hexagonally packed cylinders are observed in the ordered state at large p values while more traditional lamellar phases are found at small values of p. © 2013 American Chemical Society.
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