  We report a new computational approach to model hard-soft block copolymers
like polyurea as a liquid crystalline polymer to understand their
microstructural evolution due to mechanical loading. The resulting
microstructure closely resembles the microstructure observed in polyurea. The
stress-strain relations in uniaxial compression and tension loading obtained
from the model are also in close quantitative agreement with the experimental
data for polyurea. We use the model to elucidate the evolution of the hard and
the soft domains during loading, which is consistent with the experimental
measurements characterizing microstructural evolution in polyurea.
