Sofia Moschin — SISSA #
Polymers with Associative Motifs: Annealed and Quenched Treatments #
We develop a density-functional theory for solutions of associating polymers where attractions among charged monomers (stickers) are represented by local binary degrees of freedom, which are randomly placed along the chains.
Extending the original Garel and Orland's field-theoretic scheme for single-chain systems to an ensemble of interacting chains, we give the exact formulations of the model in both cases of annealed and quenched distributions of charges which we solve at the mean field level.
The solution roduces qualitatively different free energy functionals.
In the annealed case, the theory naturally yields a nontrivial scalar order parameter for the fraction of bonded sticker monomers and a self-consistent mass-action law at the saddle point.
By contrast, In the quenched case no independent bonding order parameter emerges and the main effect is a renormalization of the effective two-body interaction parameter.
The formulation is microscopic at the Hamiltonian level and, within the same field-theoretic framework, provides a systematic starting point for fluctuation corrections beyond the mean field approximation.