The effect of blocking the functional groups in unsaturated polyester resins on the viscosity of their styrene solutions
The effect of various factors, in particular of molecular mass and hydrogen bonds, on the viscosity of styrene solutions of unsaturated polyesters has been discussed. It has been found that blocking of a part of functional groups of polyester with a monocarboxylic acid (benzoic, oleic or stearic acid) results in a decrease of solution viscosity. The viscosity of solutions of polyesters of Mn < 1100 with free carboxylic groups and of polyesters of Mn < 1300 with groups blocked with monocarboxylic acids decreases only inconsiderably with the decrease of Mn of polyester. Thus, the range of Mn from 1100 to 1300 is the most advantageous one for the processing of polyesters with end-groups blocked with monocarboxylic acid.
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