Recently, in the development of highly filled rubbers using highly dispersed types of carbon black and silica fillers, the problem of obtaining the required degree of dispersion of fillers, stability of the plastic properties of rubber mixes, and reduction in heat build-up during their preparation and processing is urgent in the tyre industry.

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Polyurethane metal complexes (PUMC's) have been synthesized on the basis of the polynucleus complexes of Cu(II) and Fc(JIT), where the metals are connected by chlorine bridges, symmetrical aromatic diisocyanates and azoaromatic compounds; these complexes exhibit propefiies of thermotropic liquid crystals. The mesophase temperatures of the substances range from is 20-80 OC and 60-11W. Specific electric resistance of the synthesized liquid crystal systems is 103-10s nem.

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The effect of the thermally expanding flame retardant dosage as well as its combination with the modifier - the product of silicone rubber waste destruction - on the properties of cold-cured compositions based on low-molecular-weight silicone rubber was studied. It was shown that equal mass substitution of aluminum hydroxide for thermally expanding graphite in an amount of 5% by weight results in sealants with a swelling ratio of 5.8, which is sufficient for fire retardant systems used in nuclear and thermal power plants. It was established that the use of an optimal amount of destructive material (5% by weight) in combination with thermally expanding graphite leads to an increase of the conditional strength at break of silicone flame-resistant cold-curing compositions by 35%. The use of thermally expanding graphite and the silicone waste destruction product in the formulation of a silicone sealant reduces the cost of the composites obtained by 6% in terms of raw materials.