I I il 200 300 nm Fig. 5. Ultraviolet spectra of the metal-containing polyurethanes b e attributed t o t h e reduction in molecular weights in these polyurethanes o n dissolution due t o t h e dissociation of the metal-oxygen bonds. There m a y also b e partial reversible dissociation of t h e metal oxygen bonds, which will lead t o lower molecular weights in solution. Moreover it was also found t h a t t h e viscosity of t h e polymer solutions increased in t h e order Cd > Zn > Hg. Three-dimensional crosslinked polymers based on oligocarbonate(meth)acrylates with different chain lengthsThermal volume cxpansion, mechanical properties and thermostability of three-dimensional polymers of oligocarbonate(meth)acrylates have been studied by methods of dynamic dilatometry, longitudinal tension and thermogravimetry. With increasing length of the oligomeric unit the number and temperature position of the observed relaxation processes are changed, the values of tensile strength and modulus of elasticity are decreased, and the thermostability of the three-dimensional polymers is reduced.
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