This work reports nanosecond and picosecond spectroscopic studies of the dynamics of singlet excitation in solid polymers with phenyl chromophores attached to the monomeric base units. The transport of singlet excitation was found to be dispersive at both room temperature and 77 K. The nonhomogeneous kinetics and the temperature effect observed for the relaxation and trapping of the singlet excitation of phenyl groups are attributed to the energetic disorder in the amorphous polymeric solids. A Gaussian model is used to describe the excitation migration, relaxation, and trapping processes. The concentration of excimer forming sites (EFS) and the excitation migration rate are measured to characterize the excitation transport properties of different polymers. The density of excimer forming traps is effectively modulated by dispersing the chromophores away from the polymer main chain, and a concentration of EFS around 100 mM is found in polystyrene, while a concentration of 12.5 mM is measured in poly(benzyl methacrylate) and 6.3 mM in poly(2-phenylethyl methacrylate) at room temperature. The excitation migration rates measured in these polymers show strong dependence on phenyl chromophore concentration and sample temperature. The average migration coefficients of phenyl excitation were found to be 1.1 x 10(-3) cm(2)/s in polystyrene, 2.7 x 10(-5) Cm-2/s in poly(benzyl methacrylate), and 1.9 x 10(-5) cm(2)/s in poly(2-phenylethyl methacrylate) at 293 K. From the spectral broadening and the temperature dependence of excitation migration rate, the width of the energy distribution of the phenyl excitation among different sites is estimated to be 150-165 cm(-1) in solid films of all three polymers. An examination of the variation of the excitation migration rate with the density of the phenyl chromophores in the polymers shows that multipolar and exchange interactions are the major mechanism for excitation transport in polymers which contain high concentrations of donor chromophores.