The morphology of some polyetherester-ureas were studied by <sup>13</sup>C CP/MAS and <sup>1</sup>H wide-line NMR spectroscopy. It was found that the HDI and MD
The effect of self absorption on the ratio of excimer to monochromophore emission intensities, I_e/I_m, has beenexplored by experimentally changing the solution
A new statistical theory based on the rotational isomeric state model de-scribing the chain conformational free energy has been proposed. This theory can be use
Two series of new liquid crystailine polymers with T-shaped two-dimensional mesogenicunits were synthesized by low temperature solution polycondensations of 4-s
The effects of magnetic field on the graft ratio and stereoregularity of grafts of PVA-g-MMA in the presence ofbenzophenone during UV irradiation are discussed.