Thermoelastoplasts based on the mixture of thermoplastic polyolefins and butyl rubber
This paper presents the results of a study of the inluence of the concentration of butyl rubber and dicumyl peroxide on the strength and thermophysical properties of polymer mixtures based on thermoplastic polyoleins. The principal possibility of obtaining of thermoplastic elastomers with predetermined physical and mechanical characteristics are shown. The concentration of butyl rubber is varied from 0 to 50 wt. %, and the dicumyl peroxide from 0.5 to 2.0 wt. %. It is experimentally established that in the process of studying the deformation-strength properties for thermoplastic polyoleins, the appearance of tensile yield stress and ultimate tensile stress is typical. However, as the concentration of butyl rubber in the thermoplastic composition increases, the diference between the tensile yield stress and ultimate tensile stress is sharply reduced. And, when the diference between these strength parameters completely disappears, the polymer composition begins to exhibit the properties of the thermoplastic elastomer. The additional introduction of crosslinking agent - dicumyl peroxide into the composition of polymer mixtures promotes the appearance of the rubber-like plateau on the thermomechanical curves, which, as is well known, is characteristic for vulcanized rubbers. The most optimal concentrations of dicumyl peroxide and butyl rubber are determined, as a result of which the highest physicomechanical properties in polymer compositions are achieved. An interpretation of the observed regularities in the change of physicomechanical and physicochemical properties of polymer composite materials is given.