We use Brownian dynamics (BD) simulations to generate a theory for the rheology of networks of latex particles linked by bridging telechelic polymers into a reversible network. We use a a self-consistent field theory (SCFT) to assess the equilibrium balance of bridges between particles and loops on a single particle through telechelic polymers that stick at their ends to the colloids.  The repulsive potentials calculated from net interparticle forces obtained from BD simulations agrees at modest particle separations with potentials from ones determined by SCFT predictions combined with the Derjaguin approximation. Similar methods allow us to account for the effect of bridging of colloids across the gap, producing an attractive well in the inter-particle potential.  These effective pair potentials, combined with particle-level simulations, or the sticky-hard sphere model, allow us to study equilibrium phase behavior of waterborne latex supensions, as well as inform models that capture the dynamics of these transient networks to ultimately predict and design the rheology of latex paints.

Simulations of telechelic polymers transitioning between hydrophobic surfaces with applications to latex paint rheology

ACS Spring 2022

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