The effect of thickness and reinforcement on the properties of the mastic layer of an incongealable sealant based on butyl rubber is studied, depending on the nature of the glued substrate. It has been established that the nature of the substrate affects the adhesive properties of the mastic. The effect of the thickness of the mastic layer on the adhesive properties is most pronounced in determining the bond strength by the tear-off method. The influence of the nature of the substrate on adhesion to the mastic layer is considered from the standpoint of acid-base interactions. The possibility and expediency of reducing the thickness of the incongealable mastic layer based on butyl rubber of the sealing coating of roofing purpose to the level of 0.5 mm without loss of quality is established. It is shown that the reinforcement of sealing coatings based on highly filled butyl rubber does not affect their vapor permeability and strength during peeling and tearing.
The paper presents the results of a study of the influence of the nature fillers (wood flour, wood dust, vermiculite, expanded vermiculite, organoclay) and a polymer matrix (elastomer and thermoplastic) on the sound-absorbing and physico-mechanical characteristics of polymer composite materials. As a result of the studies, it was shown that sound absorption depends on the polymer matrix used - the sound absorption coefficient in the frequency range 2500-5000 Hz is greater for an elastomer-based composite material. It was also found that the nature of the studied fillers, as well as their content, practically does not affect the level of sound absorption of the polymer composite material. Differences appear only at a frequency of 6300 Hz. At high frequencies, expanded vermiculite has shown itself to be the most effective filler in terms of improving sound insulation properties. In the case of using, as a polymer-based thermoplastic, the introduction of a filler does not affect the values of the sound absorption coefficient in the entire frequency range.
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.