  We develop a comprehensive continuum model capable of treating both
electrostatic and structural interactions in liquid dielectrics. Starting from
a two-order parameter description in terms of charge density and polarization,
we derive a field-theoretic model generalizing previous theories. Our theory
explicitly includes electrostatic and structural interactions in the bulk of
the liquid and allows for polarization charges within a Drude model. In
particular, we develop a detailed description of the boundary conditions which
include the charge regulation mechanism and surface polarization. The general
features for solving the saddle-point equations of our model are elucidated and
future applications to predict and validate experimental results are outlined.
