  In this work we study the warm equation of state of asymmetric nuclear matter
in the quark meson coupling model which incorporates explicitly quark degrees
of freedom, with quarks coupled to scalar, vector and isovector mesons.
Mechanical and chemical instabilities are discussed as a function of density
and isospin asymmetry. The binodal section, essential in the study of the
liquid-gas phase transition is also constructed and discussed. The main results
for the equation of state are compared with two common parametrizations used in
the non-linear Walecka model and the differences are outlined.
