The article deals with the influence of the concentration of butyl rubber and vulcanizing agents on the process of reactive extrusion of elastoplastics based on a mixture of thermoplastic polyolefins. The mechanic-chemical synthesis of dynamically vulcanized elastoplastics was carried out in the process of reactive extrusions. Single screw extruder with ratio L / D = 24 consists of 4 zones: loading zone, compression zone, dosing zone, extruder head. The number of turnovers of the screw was regulated using an asynchronous engine. The head is equipped with a slotted console enabling to obtain continuous sheets 2 mm thick and 100 mm wide. As thermoplastic polyolefins there was used the polyethylene of low density, polypropylene. Vulcanization of polymer mixtures was carried out using the dicumyl peroxide and sulfur. The mechanochemical synthesis of elastoplastics was carried out at different temperatures of the zones of material cylinder and extrusion pressure. The results of the study of the influence of extrusion process parameters on the melt flow rate of elastoplastics were presented. For a mixture of polyethylene and butyl rubber of low density the optimum temperature for zones of the material cylinder varied within 100 150 ° C, and the extrusion pressure was 5.2 7.0 MPa. For a mixture of polypropylene and butyl rubber the temperature regime varied within 140-210С and pressure of extrusion-7.2-9.4 МPа. To add elastoplastic properties to the polymer mixtures, vulcanizing agents such as dicumyl peroxide and sulfur were introduced into their composition. Selective influence of vulcanizing agents on the nature of changes of technological parameters of reactive extrusion and melt flow index was investigated. It found that dynamic vulcanic elastoplastics with unique compatibility of structures and properties can be obtained in at concentrations of dicumyl peroxide 0.5 wt.% or sulfur5.0wt.%. It revealed that dynamic vulcanic elastoplastics with unique compatibility of structures and properties can be obtained in the concentration of dicumyl peroxide 0.5 wt.% or sulfur 5.0wt.%. It established that the concentration of butyl rubber in
The paper presents the results of a study of the influence of the concentration and particle size of the filler on the thermomechanical properties of composite materials based on polypropylene and waste from waste processing industry (thermal ash). Three grindings of thermal ash were used with particle sizes: 90 nm, 300 – 500 nm and 1200 – 2000 nm. It has been established that with an increase in the size of thermal ash particles, the deformation curve in the region of the viscous-flow state shifts to the region of high temperatures. As a compatibilizer used functionalized with 5.6 wt. % maleic anhydride polypropylene grade Exxelor PO1020 to improve miscibility and compatibility of non-polar polypropylene with thermal ash particles. It is shown that the introduction of different amounts of the cross-linking agent dicumyl peroxide contributes to a significant change in the pattern of deformation of nanocomposites with temperature. The concentration of dicumyl peroxide was varied within 0.25 – 2.0 wt. %. Peroxide crosslinking using 0.25 – 0.5 wt. % dicumyl peroxide contributed to the appearance of a region of highly elastic deformation on composites with 5.0 and 40 wt. % thermal ash. With an increase in the concentration of dicumyl peroxide over 0.5 wt. % vitrification of nanocomposites was observed. In this state, the samples are completely crosslinked and pass into the infusible state. Such an infusible state is highly undesirable since it is not possible to process them by injection molding and extrusion.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.