“…There is then the suggestion of a common underlying mechanism susceptible to theoretical treatment. Thus, the field and temperature-dependent behavior of molecular dispersions is also observed in polymers with transport-active pendant groups like poly( N -vinylcarbazole), in polymers in which small-molecule moieties are incorporated in a main chain in sigma-conjugated polymers, , and most recently in certain poly π-conjugated systems. , Figure is a plot of the field dependence of hole drift mobility in the polymer PTPB parametric in temperature over a 60 K range . PTPB is a glassy polymer in which TPD moieties are covalently bonded into a main chain .…”