Flame retardant and durable chloroprene rubber and styrene-butadiene rubber blends crosslinked with copper(I) oxide
- PDF / 1,753,523 Bytes
- 17 Pages / 595.276 x 790.866 pts Page_size
- 118 Downloads / 206 Views
ORIGINAL RESEARCH
Flame retardant and durable chloroprene rubber and styrene‑butadiene rubber blends crosslinked with copper(I) oxide Piotr Kobędza1 · Aleksandra Smejda‑Krzewicka1 · Anna Olejnik1 · Krzysztof Strzelec1 Received: 20 December 2019 / Accepted: 14 October 2020 © The Author(s) 2020
Abstract The purpose of this work was to investigate the effect of application of copper(I) oxide (Cu2O) as an unconventional crosslinking agent of chloroprene (CR) and styrene-butadiene (SBR) rubber compositions. The use of C u2O arises from the need to limit the application of ZnO as a CR crosslinking agent. The obtained results indicate that CR/SBR blends crosslinked with Cu2O are characterized by good mechanical properties and a high degree of crosslinking The results show that the proportion of both processing rubbers, as well as the amount of copper(I) oxide, influence the crosslinking of CR/SBR blends and the properties of the vulcanizates. Performing FTIR analysis has allowed the development of a crosslinking mechanism. Crosslinking presumably takes place according to the mechanism of Friedel–Crafts alkylation reaction. Silica, chalk, china clay and nanofiller (montmorillonite modified with quaternary ammonium salt containing hydroxyl groups) were applied as fillers. Among the fillers, silica had the greatest impact on improving the properties. It is arisen from silica activity, unlike other used fillers. The AFM analysis allowed us to determine the miscibility of the rubbers and dispersion of fillers. Thermal analysis was performed to determine the changes occurring as a result of material heating. The low intensity of the peaks corresponding to the crosslinking of the CR/SBR blends may indicate a small amount of bonds formed during heating, or possibility is the formation of connections between chains with a low binding energy. The use of chalk, china clay or silica increases the thermal stability of the vulcanizates. Obtained vulcanizates were characterized by increased incombustibility. The study of combustion time in the air showed that the prepared vulcanizates did not support the burning. Keywords Copper(I) oxide · Chloroprene rubber · Styrene-butadiene rubber · Crosslinking · Flame retardant
Introduction Chloroprene rubber (CR) is a material classified as a specialist elastomer. It results from its unique properties, namely good mechanical properties, resistance to technical media, susceptibility to crystallization, good adhesion and susceptibility to thermo crosslinking [1–3]. The greatest advantage of this elastomer is its increased flame resistance. This is related to the presence of chlorine atoms in the rubber main chain, which also influences the resistance to aging [4–6]. However, the use of CR in industry is limited and the chloroprene rubber is replaced by cheaper materials or elastomer compositions. Currently, the industry requires materials to * Piotr Kobędza [email protected] 1
Faculty of Chemistry, Institute of Polymer and Dye Technology, Lodz University of Technology, Stef
Data Loading...
