Properties Of Chloroprene Rubber Research Articles

Effects of decabromodiphenyl ethane flame retardant on the combustion behavior and physical‐mechanical properties of chloroprene rubber: Experimental and molecular dynamic simulation

AbstractHerein, a molecular dynamics simulation method was used to predict the compatibility of chloroprene rubber (CR) and decabromodiphenyl ethane (DBDPE) and to investigate the mechanical properties of CR‐based composites. The limiting oxygen index and cone calorimeter measurement values indicated that the addition of DBDPE was beneficial for reducing the peak heat release rate during combustion and facilitating the formation of compact and strong char layers for carbon black‐filled CR composites, resulting in efficient reduction of flammability and fire risk. Incorporation of DBDPE obviously delayed the dehydrochlorination of the CR matrix. Moreover, adding 50 phr DBDPE had little effect on the tensile strength and elongation at the break, and increased the modulus at 100% elongation by 64.3% in contrast to CR without DBDPE. However, the cold properties of CR vulcanizates decreased slightly with an increase in the DBDPE content.

Regulation effects of trans-1, 4-poly (isoprene-co-butadiene) copolymer on the processability, aggregation structure and properties of chloroprene rubber

Chloroprene rubber (CR) with excellent performances including flame retardancy and weather resistance, also suffers limitations like poor processability and unsatisfied fatigue resistance. Herein, a facile and effective method is proposed to modify CR by introducing trans-1,4-poly (butadiene-co-isoprene) copolymer (TBIR) as reactive component. The influences of TBIR component on rheological behaviors, crystalline behaviors, phase morphology and properties of CR/TBIR blends are studied. With increasing TBIR amount in CR/TBIR blends, the viscosity decreases, while the initial vulcanization induction time and the stress relaxation rate increase significantly, indicating improved fluidity, plasticity and processing safety of the CR/TBIR blends. A microphase separation morphology with TBIR domain in several-hundred nanometers and trans-1,4-polyisoprene (TPI) lamellar fibrils penetrating both TBIR and CR domains is observed in the un-vulcanized CR/TBIR blends. The CR/TBIR (90/10) blend with satisfied properties is recommended for potential applications in conveyor belt, vibration damper, etc.

The Effect of Thermal Oxidation on the Adhesion Properties of Chloroprene Rubber

The Effect of Thermal Oxidation on the Adhesion Properties of Chloroprene Rubber

Property modification of chloroprene rubber by addition of ultra-fine acrylic rubber powder

The role of ultra-fine pre-vulcanised acrylic rubber powder (ACMP) in properties of chloroprene rubber (CR) was studied. ACMP was incorporated into CR at various loadings and the properties of the ACMP filled CR were investigated. Owing to the high thermoplastic nature of the ACMP, better processability is obtained with increasing ACMP loading. Even though the presence of ACMP gives negative effect on cure rate and state of cure, both modulus and hardness of the vulcanisates increase continuously with increasing ACMP loading. The tensile strength is also improved with increasing ACMP loading up to 20 phr. Nevertheless, elasticity and abrasion resistance of the vulcanisates are impaired as the concentration of ACMP is increased. This is mainly attributed to the combination of dilution effect and reduced crosslink density. Since ACMP is fully saturated and highly polar, the incorporation of ACMP into CR gives rise to enhanced aging and oil resistance of the vulcanisates.

Study on the Material Life of OMEGA Water-Stop

In this paper, through the study on physicochemical properties of chloroprene rubber which used in immersed tube tunnel, and comprehensive analysis of the stress relaxation process of aging, together with the analysis of IR spectra of chloroprene rubber, and the accelerated aging test data, we forecast the lifetime by using WLF equation method at the room temperature, and judge that chloroprene rubber can meet with the requirements of the design life of 120 years.

Preparation and properties of water‐absorbent composites of chloroprene rubber, starch, and sodium acrylate

AbstractThe effects of the amounts of starch, sodium acrylate (NaAA) and dicumyl peroxide (DCP) on the properties of chloroprene rubber (CR)/starch/NaAA composites prepared by melting method were investigated. The results showed that the addition of starch improved the mechanical properties, but decreased the water‐absorbing capacity of the composite, most likely due to the decrease in the local concentration of the main water‐absorbing material sodium polyacrylate and the increase in crosslinking density of the composite resulting from the reaction between starch and CR. This reaction was verified by the vulcanized curves, DSC curves, and the cut surface morphology. The as‐prepared composite demonstrated higher water‐absorbing capacity, resulting from the incorporation of NaAA. The mechanical properties decreased with increasing the DCP loading, and the water‐absorbing ratio is the maximum at 1.0 phr DCP. The tensile strength of the composite decreased significantly after water immersion, due to the absorbed water acting as a plasticizer. The extracted component from composites after water immersion is mainly sodium polyacrylate according to Fourier transform infrared (FT‐IR) spectroscopy analysis. The morphology of the composites before and after water immersion was observed by optical transmission microscopy (OTM). The results indicated that the starch exhibits a good dispersion state, and the water‐absorbing capacity results primarily from sodium polyacrylate. Copyright © 2010 John Wiley & Sons, Ltd.

Rust inhibiting rubber gaskets based on anticorrosive pigments

Rubber gaskets find wide applications in steel structures. Gaskets are usually used on the edges or on the nail hole positions. These are the weakest positions, where corrosion starts, whether the structure is protected by paint or by other methods. In this work, anticorrosive pigments were incorporated in rubber formulations. They are tested by corrosion protection when used as gaskets with steel panels. Results showed that the presence of anticorrosive pigments in rubber gaskets prevents early rusting under it in comparison with the blank. Zinc‐tetroxy chromate pigment exhibited the highest rust inhibiting power when chloroprene rubber formulations were used. The change of the pigment percent barely affect the quality of protection when syrenebutadiene rubber formulation were used. Zinc tetroxy chromate pigment improved the physico‐mechanical properties of chloroprene rubber under investigation. The used formulations can tolerate thermal oxidative aging at 90°C up to 8 days. The rate of vulcanization was not affected by increasing the concentration of the inhibitive pitments.

Processes of structure formation and mechanical properties of chloroprene rubber

Processes of structure formation and mechanical properties of chloroprene rubber