INFLUENCE OF PLASTICIZATION OF ISOPRENE RUBBER ON PLASTICITY OF RUBBER COMPOUNDS

Abstract

This article is a continuation of a series of articles on the correct choice of parameters of the processing of rubber compounds for tires and rubber technical goods. Some features of the process of plasticicization (P) synthetic isoprene rubber (SKI-3), in particular the characteristics of its four main fractions: ultra-high molecular weight (SWMF), high molecular weigh (WMF), middle (SMF) and low molecular weight (NMF) on plasticity (PL) of rubber compounds are under consideration. Empirical equations are presented, the main is obtained by the method of experimental planning, describing this process under the assumption of constancy of parameters in a narrow range of temperatures T and times t of P. It is shown that the experimental values of PL at T = 30 °C for NMF and SMF mainly increase with increasing t, for WMF they change little, and for SWMF they decrease, which coincides well with the calculated values. The effective activation energies P for different T are calculated. The dependences of the equation constants on the molecular weight of the corresponding fractions and their physical meaning are under discussion. An equation is proposed that allows calculating the PL of a rubber compounds at a given T depending on the initial М_w and t.