  The critical field of the Freedericksz transition and switching dynamics are
investigated for polymer stabilized nematic liquid crystals as a function of
polymer concentration. A simple phenomenological model is proposed to describe
the observed critical field and dynamic response time behaviors as a function
of concentration. In this model the polymer fibrils form director domains,
which are bounded by virtual surfaces with a finite anchoring energy. The
Freedericksz transition occurs independently within each of these domains.
