FIELD: chemistry.
SUBSTANCE: invention relates to branched synthetic polyisoprenes, which posses a macrostructure and a microstructure, close to natural rubber, and the method of obtaining them. Cross-linked branched polyisoprene has the apparent stress F/S0, equal or above 0.4 MPa, for the relative elongation a by 150%, applied to the model in the form of a dumbbell, which consists of aforesaid cross-linked polyisoprene. According to another aspect of the invention, these: ctg δ≥0,3761- ηinh+0.15, where ctg δ indicates the cotangent of the angle of loss of aforesaid polyisoprene, which is checked when the temperature is 130°C with the aid of a device under the trade name "RPA2000", the said model being subjected to shear stress with 10% deformation and frequency of 0.035 Hz, and where ηinh is the viscosity of aforesaid polyisoprene, measured in toluene at a temperature of 25°C and with the concentration of polyisoprene in the toluene at 0.1g/dl.
EFFECT: increase in the ability of polyisoprene to crystallise under the action of stretching.
24 cl, 7 dwg, 2 tbl
