Non–destructive analysis and express control of technological processing of polymer compositions: II. Isothermal physical and chemical kinetics

The capabilities of the elastic and dissipative dynamical mechanic functions, measured using the combined right torsion pendulum method, have been established with respect to the achievement of express testing and non–destructive control of the isothermal processes of drying of polymer solutions and of the chemical kinetics of olygomers put to isothermal curing. It has been established that tgδG = f(t) was a more sensitive mechanical dynamic function than G′′ = f(t) with respect to the studying of isothermal physical kinetics. An isothermal relaxation transition, accompanying both the processes of physical and chemical kinetics of the tested materials, has been observed. The chemical kinetics of a typical reactoplast, a type of epoxy resin put to isothermal curing, has been established too. A transition from viscoflow into the rubber–like state has been observed.