Résultats de recherche
This chapter is an overview of the science and technology of vulcanization. Emphasis is placed on general-purpose “high-diene” rubbers like natural rubber (NR), styrene-butadiene rubber (SBR), and butadiene rubber (BR), vulcanized by sulfur in the presence of organic accelerators. Select Chapter 8 - Reinforcement of Elastomers by ...
1 mars 2024 · Nitrile rubber (NBR), also known as nitrile-butadiene rubber, is a synthetic rubber produced by polymerizing Acrylonitrile (CH2 CHCN) and Butadiene (CH2CH–CH CH2). Fig. 1 illustrates the chemical formula of NBR. It is commonly used for its resistance to oil, fuel, and fat [27, 28]. The hardness and resistance to oil, abrasion, and heat ...
1 juil. 2024 · The model rubber compound, described in Table 1, is prepared using NR (Technically Specified Rubber SVR 3 L). The antioxidant N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD) is added to hinder the effect of oxygen through the thermo-oxidation process. All compounds are mixed in a Proteo internal mixer with a nominal capacity of 1.5 ...
7 mars 2024 · Tire rubber is susceptible to ozonolysis, or the oxidative cleavage of carbon‑carbon C C double bonds, leading to cracks and crazing in the rubber (Newton, 1945). Tire particles are also subject to thermal degradation, sometimes reaching temperatures of up to 60 °C on hot asphalt ( Higashiyama et al., 2016 ).
1 déc. 2021 · Rubber degradation methods should also be developed as it enables completion of circular economy establishment of rubber. Waste rubber with inferior properties should be subjected to degradation that enables the circular economy's material and energy recovery pathways. All the methods discussed in this manuscript can be effectively used for ...
17 juil. 2024 · The rubber tree could produce large amounts of NR that sets it apart from other rubber plant species. 17 NR is a secondary metabolite composed mostly of cis −1,4-polyisoprene with trans-isoprene units at its ω-terminus. 18 In summary, the NR biosynthesis pathway can be divided into four phases: formation of isopentenyl diphosphate (IPP) and its isomer dimethylallyl diphosphate (DMAPP).
1 sept. 2024 · Waste rubber use to prolong pathways should focus on efficiency and sustainability to improve feasibility; redefine economic, societal, and ecological goals; and establish inclusive recycling systems under new operational models through careful and in-depth planning (Wang and Shen, 2023). First, waste rubber can be used to produce durable ...
Chloroprene rubber (CR) is a synthetic rubber that is also known by the trade name Neoprene. CR has a good balance of properties, including good chemical stability and usefulness over a wide temperature range. Examples of the uniaxial compressive response are summarized in Figures 11.6 and 11.7.
Nitrile rubber, which is also called Buna-N or NBR, is an unsaturated synthetic copolymer. It is commonly used to make hoses, seals, gloves, and many other industrial products. The mechanical response of nitrile rubber can be tested in many different ways. The example shown here used uniaxial compression at different strain rates and strain cycles.
5.51 Thermoplastic Rubber (for Use in Adhesives) Thermoplastic rubber is a relatively new class of polymer. It has the solubility and thermoplasticity of polystyrene, while at ambient temperatures it has the toughness and resilience of vulcanized natural rubber or polybutadiene. These rubbers are actually block copolymers.
