Study of the structure and curing of thiourethane elastomers based on oligomer compositions

Data on the structure formation of thiourethane elastomers based on oligo(diene diols) and polysulfide oligomers are generalized. The curing of oligo(diene diols) by polyfunctional isocyanates in the presence of liquid thiokols and glycerol is characterized by the formation of highly branched molecules already at the early stages of structure formation. This feature predetermines the microheterogeneous character of the process and the appearance of the gel fraction at low conversions of functional groups. The maximum values of the curing rate and crosslink density are achieved at NCO: (OH + SH) = 1.