Influence of curing temperature and system composition on viscoelastic properties and crosslink density of polyurethane optically-transparent materials.

Influence of the curing temperature, the ratio prepolymer -- curing agent and the solvent content on the viscoelastic properties and the crosslink density of the spatial three-dimensional network of the polyurethane optically-transparent materials was studied. According to the viscoelastic properties data it was established, that increase of the curing temperature, as well as an increase of the concentration of NCO-groups in the reactionary mixture is favourable for forming of the more crosslink structure of the polymer material. The optimum concentration of the solvent for obtaining of the polyurethane optically-transparent material with the highest value of the crosslink density of the polymer was determined. [ABSTRACT FROM AUTHOR]