The morphology and melt rheological properties were characterized for
a polymer blend where the viscosity ratio was changing with time. The
reactive phase, an ethylene methyl acrylate (EMA) copolymer containing
a diol, was blended in the melt with linear low density polyethylene
(LLDPE). Dual continuity was found for the initial morphology of the r
eactive blends over a broad range of composition in contradiction with
the phase inversion rule: Phi(A) eta(B) = Phi(B) eta(A). The influenc
e of blending conditions and annealing on the initial morphology was s
tudied. For a blend where the LLDPE phase is initially dispersed in EM
A, the torque and normal force measured in the parallel plate geometry
go through a maximum when the morphology becomes co-continuous. (C) 1
997 Elsevier Science Ltd.