Synergistic Reinforcing and Stabilizing Effect of Carbon Black–Zinc Dimethacrylate on the Ethylene Propylene Diene Monomer and Improving Mechanism of Sealing Resilience

Abstract

Ethylene propylene diene monomer (EPDM)/carbon black (CB)–zinc dimethacrylate (ZDMA) vulcanizate as a sealing material was prepared. Compared with EPDM, the addition of CB–ZDMA resulted in a remarkable increase in tensile/compressive properties, storage/loss modulus, and glass transition temperature, superior to that of vulcanizates with CB or ZDMA. Moreover, the increase in the compression set and decrease in the stress relaxation coefficient were inhibited during stress-thermal oxidation aging, resulting in enhancement of durable sealing resilience performance of vulcanizate. Combination of CB–ZDMA not only facilitated dispersion of CB in the matrix but also improved interface interaction and dispersion of ZDMA. A multiple covalent/ionic cross-linking network structure with increasing cross-linking density formed in composite during vulcanization, which maintained a stable free radical signal and cross-linking density, presented minimum degradation rate and carbonyl index growth rate, and surface damage was inhibited during aging, leading to retardation of cross-linking, degradation, and oxidation of EPDM molecules. Thus, synergistic reinforcing and the stabilization effect of CB–ZDMA on EPDM were achieved.

Synergistic Effects of Amine‐Containing Antioxidants on the Aging Performances of Ethylene Propylene Diene Rubber

“…The intense bands of EPDM are located at 2918 and 2850 cm −1 , which are assigned to the asymmetric and symmetric stretching vibration of methylene in backbone, respectively. Peaks at 1464 and 1377 cm −1 are corresponded to the bending vibration of CH 2 groups and the symmetric C−H stretching vibration of methyl, respectively . After aging, new absorption peak appears at the shift of 1734 cm −1 , which is attributed to the stretching vibration of C=O bonds, thereby, carbonyl groups are formed during the aging process .…”

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

“…Moreover, the formation of ionic clusters with the contribution of zinc ions from co-agent molecules has also been observed. 26,35–37 It has also been demonstrated that zinc methacrylate exhibits a strong adhesion to polar materials. 38,39 Ferrites are complex compounds of metal oxides.…”

Improving reinforcement of natural rubber latex by introducing poly‐zinc dimethacrylate and sulfur vulcanizing system

“…[ 33 ] Yuan et al reported that EPDM/CB/ZDMA composite was used as sealing material, and the results showed that the addition of CB‐ZDMA resulted in a significant improvement in tensile and compression properties. [ 34 ] Lin et al used ZDMA‐modified GE as a nanofiller to reinforce NR, the results showed that the cross‐link density of NR composites was greatly improved, and the thermal conductivity of 40 phr ZDMA‐GE/NR composite was 1.3 times that of pure NR. [ 35 ] Yuan et al prepared ZDMA/GE/EPDM composite, the results show that both molecules of EPDM and ZDMA were inserted into graphene layers with strong interfacial interaction.…”

“…In the aging process, the increase in compression set and the decrease in contact stress relaxation coefficient can be suppressed, thereby improving the durability of the sealing elasticity. [11,34] Dong et al prepared magneto rheological elastomers (MREs) by mixing silicone rubber with ZDMA and carbonyl iron particles, the results showed that the distribution of carbonyl iron particles was obviously improved by the addition of ZDMA. [36] There are two main processes for the preparation of ZDMA/rubber composites.…”