Аннотация:The kinetics of formation of a three-dimensional structure in compositions based on butyl rubberand silicon-containing hyperbranched polymethylsilsesquioxanes and MQ copolymers is studied in comparisonwith compositions containing common dispersed phases: carbon black and silica. Features of the chemicalstructure of the synthesized organosilicon polymers make it possible to treat the morphology of their elementaryparticles as core–shell. The role of an inorganic “core” is played by silica structures, whereas methylshells should ensure compatibility with the carbochain matrix of the rubber. Quinol ether is used as an agentof crosslinking via double bonds of the isoprene part of the rubber. The crosslinking process is carried out inthe mode of continuous heating of compositions with registration of thermal effects by differential scanningcalorimetry and dynamic moduli by oscillatory rheometry. The apparent activation energies of the process ofchemical crosslinking under nonisothermal conditions are calculated in terms of various models. It is shownthat the apparent activation energy of crosslinking is lower for filled systems. This indicates that rubber macromoleculesare partially uninvolved in chemical crosslinking as a result of adsorption and loss of relaxationmobility. The adsorption activity of fillers is estimated from a difference in the activation energies of the initialrubber and filled compositions; this parameter is the lowest for polymethylsilsesquioxanes.
