Influence of the Peroxide Vulcanization Coagent on the Properties of a Blend of Polypropylene with Hydrogenated Styrene-Butadiene-Styrene Block Copolymer

Macromolecular Symposia

Hložeková

et al. 2021

Strontium ferrite in constant loading is incorporated into acrylonitrile butadiene rubber in order to prepare rubber magnetic composites. Sulfur, peroxide and combined sulfur/peroxide curing systems are applied for cross‐linking of rubber composites. The work is focused on the investigation of curing system composition and thermo‐oxidative ageing on cross‐link density, physical‐mechanical and magnetic properties of rubber magnets. The results revealed that the cross‐link density and the structure of the formed cross‐links within the rubber matrices affect the property spectrum of vulcanizates.

Section: Doi: 101002/masy202000258mentioning

confidence: 99%

“…Co‐agents are multifunctional low molecular weight organic compounds, which are used to increase the cross‐linking efficiency and physical‐mechanical properties of peroxide cured elastomers. [ 5 ]…”

Section: Introductionmentioning

confidence: 99%

Influence of Combined Sulfur and Peroxide Curing Systems and Ageing on the Properties of Rubber Magnets

Macromolecular Symposia

Hložeková

et al. 2021

“…For this reason, multifunctional low molecular weight organic compounds known as co-agents are often applied to boost the cross-linking process with organic peroxides. They are used to increase the efficiency of vulcanisation process and to increase the cross-link density of vulcanisates [8]. Physical properties and treatability of peroxide-cured elastomers are subsequently improved, too [9].…”

Section: Introductionmentioning

confidence: 99%

Influence of dicumyl peroxide and Type I and II co-agents on cross-linking and physical–mechanical properties of rubber compounds based on NBR

Plastics, Rubber and Composites

Hložeková

et al. 2020

The aim of the work was the investigation of the effect of dicumyl peroxide and different types of co-agents on cross-linking and physical-mechanical properties of vulcanisates based on acrylonitrile-butadiene rubber. First, dicumyl peroxide was applied for cross-linking at different curing temperatures. Based on the achieved results, the optimum temperature and peroxide concentration was chosen for the next experiments, in which organic peroxide was combined with various Type I and Type II co-agents. The results revealed that Type I coagents take active part in vulcanisation process as they contribute to the increase in crosslink density of vulcanisates. This was reflected in the increase in modulus and hardness and the decrease in elongation at break of vulcanisates. The tensile strength was also improved by the application of Type I co-agents. On the other hand, the decrease in cross-link density and deterioration of physical-mechanical properties was recorded by application of Type II co-agents.

“…They are used to increase the cross-linking efficiency of the vulcanization process, but to increase the cross-link density of final vulcanizates as well. 12,13 As a result, physical properties and treatability of peroxide-cured elastomers are improved.…”

Section: Introductionmentioning

confidence: 99%

Combined sulfur and peroxide curing systems applied in cross-linking of rubber magnets

Polymers and Polymer Composites

Dosoudil

et al. 2020

In the present work, barium ferrite in constant loading was dosed to the rubber matrices based on NR, SBR and NBR. Sulfur, peroxide and mixed sulfur and peroxide curing systems were applied for cross-linking of rubber magnetic composites. The application of sulfur or peroxide curing system leads to the formation of different types of linkages between rubber chain segments. As the structure of the formed cross-links plays a significant role in determining the final properties of rubber articles, the main aim of the work was to use the combination of curing systems in order to suppress the disadvantages of both systems and possibly to highlight their benefits. The results showed that composition of curing system has considerable influence on cross-link density of composites, which was subsequently reflected in typical change of physical-mechanical properties and glass transition temperature. The tensile strength was improved with increasing amount of peroxide curing system. The reason can be attributed to the presence of co-agent zinc methacrylate, which exhibits strong adhesion to magnetic filler and thus it contributes to the improvement of compatibility and homogeneity on the interphase filler–rubber. On the hand, there was observed no influence of curing system composition or type of rubber matrix on magnetic characteristics of composites.