Thermodynamic compatibility and structural characteristics of interpenetrating polymer vibration damping systems for engineering purposes

This article is devoted to the study of thermodynamic compatibility and structural characteristics of interpenetrating polymer systems (IPS) based on thermosetting and thermoplastic polymers for the production of vibration-damping and sound-absorbing composite polymer materials for machine-building purposes. IPS based on epoxy polymer and polyurethane is calculated according to the well-known Flory-Scott theory at a temperature of 373 K to obtain thermodynamic compatibility of the components of the mixture. Studies have established that between the macromolecules of homopolymers that make up the system, a donor-acceptor mechanism of covalent bonding occurs due to an unshared electron of the nitrogen atom and a cross-linked structure of interpenetrating polymer systems is formed, due to the thermodynamic compatibility of the components. The studies determined that at a temperature of 330 K, the coefficient of mechanical losses has a maximum corresponding to the relaxation process associated with the segmental mobility of the chain and the dynamic modulus of elasticity of the composition monotonically decreases with increasing temperature. The maximum vibration-absorbing properties based on epoxy and polyurethane polymers can be obtained at their ratio of 65:35