Improving thermal oxidative aging resistance and anti‐reversion property of natural rubber by adding a crosslinking agent

Abstract

The reversion during the curing and the poor thermal oxidative aging resistance of natural rubber are two main problems for its use as a tire tread. To solve the problems, a crosslinking agent, 1,6-bis(N,N 0 -dibenzyl thiocarbamoyl dithio)-hexane (DBTH), is added into natural rubber/carbon black composites.DBTH can increase the crosslink density, improve the mechanical properties and thermal oxidative aging resistance of the composites. The composites with DBTH can maintain good wet-skid resistance after thermal oxidative aging. When 0.2 phr DBTH is used to substitute 0.1 phr sulfur and 0.1 phr accelerator in a natural rubber/carbon black composite, the reversion during the curing is reduced and the DIN abrasion decreases by 6%, while the modulus and hardness of the composite keep close to the original. Besides, after thermal oxidative aging at 100 C for 48 h, the rate of change of stress at 300% strain of the composite decreases by 27% with the substitution of DBTH.

Multi‐copolymerization retouch butadiene styrene block polymer resin for dual temperature change curing of wood‐based interface

“…In general, all composite resins produced polymers with a higher molar mass, implying that they have higher mechanical properties. 22 Additionally, the 1.33 wt% doping level has a perfectly high molecular weight and a narrower polydispersity, and the higher the zero shear viscosity value, the greater the group will exhibit Newtonian mechanical behavior than the wider dispersion composite group, resulting in less shearthinning behavior during deformation, 23 which is consistent with the higher apparent viscosity of XSBL-1.33 than XSBL in Table 3, which would be very beneficial for subsequent curing as a wood adhesive. This paper shows that the AH-XSBL resin, which was synthesized, can be used as an excellent wood adhesive.…”

“…In order to improve the oxidation resistance of the resin, we weaken the oxidation process of the material by introducing the grafting of reactive monomers and constructing an esterified cross-linked network structure. 23,24 As shown in Figure 6c, after 48 h of storage at room temperature, XSBL-0.67 to XSBL-0 is yellow and turbid due to insufficient anti-oxidation due to low cross-linking density; In the XSBL-1.33 group, with the gradual complete polymerization reaction, the crosslinking density of the system reaches the maximum(As shown Table 4), and the internal structure is stable, making it excellent in oxidation resistance and showing a clear white color. 25 The color of the XSBL-1.33 film remains crystal clear and has no discernible change, indicating that the composite XSBL resin has high storage stability.…”

Inverse Vulcanization Polymer-Modified Eucommia ulmoides Gum with Enhanced Shape Memory Capability and Sound Absorption Property

“…The thermal stabilities of EUG and EUG-SP-x s were characterized by TGA, and the T d5% s of EUG, EUG-SP-4 , EUG-SP-6 , EUG-SP-8 , and EUG-SP-10 were 266, 255, 243, 232, and 220 °C, respectively (Figure b), and deteriorated gradually with the increase of SP dosages. In consequence, EUG-SP-10 with high SP dosage presented a slight downward with the prolonged curing time, which may result in the decrease of rubber performances Figure S6 and Table S2.…”

“…In consequence, EUG-SP-10 with high SP dosage presented a slight downward with the prolonged curing time, which may result in the decrease of rubber performances. 50 NR-SP-xs and EUG-S-xs with similar sulfur content were prepared for comparation according to the elemental analysis results, and the results are depicted in Figure S6 and Table S2.…”

Thermal‐oxidative aging and tribological properties of carbon nanotube/nitrile butadiene rubber composites with varying acrylonitrile content: Molecular dynamics simulations

“…[1][2][3] Therefore, it is important for extending the service life of rubber, improving the efficiency of oil production, and slowing the thermal-oxidativeaging damage to rubber. [4][5][6] The thermal-oxidative aging and tribological properties of rubber materials have been extensively studied. Han et al [7] investigated the effect of crosslinking density on the mechanical properties of NBR composites before and after thermal-oxidative aging.…”