• Elastomers and Composites
• /
• v.26 no.2
• /
• pp.109-114
• /
• 1991

The graft copolymerization of chloroprene rubber with methyl methacrylate in toluene solution has been carried out varying the concentration of monomer, initiator, CR, reaction time, and reaction temperature, etc.. It is observed that the grafting reaction follows conventional kinetic behavior under the present experimental conditions. Identification of grafting on to chloroprene rubber was obtained through characterization of the graft copolymer by infrared spectrometer.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.17 no.11
• /
• pp.1205-1211
• /
• 2004

This study has investigated radiation degradation of chloroprene rubber in the presence of some fire retardant. Ammonium polyphosphate, aluminium trihydroxide, magnesium hydroxide, calcium carbonate and antimony trioxide were selected as flame retardant. Samples were irradiated using a Co$^{60}$ ${\gamma}$ -ray and ray up to 2000 kGy at a dose rate of 5 kGy/hr in the presence of air atmosphere at room temperature. After irradiation, samples were assessed fire retardancy with electrical properties and mechanical properties. Some considerations concerning the effects of the fire retardants added to chloroprene rubber on the radiation and thermal stability of chloroprene rubber are presented. From fire retardancy with electrical and mechanical property measurements, it was found that addition of magnesium hydroxide resulted in maximum fire retardant effect.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2003.11a
• /
• pp.553-556
• /
• 2003

This study is analyzed about the factor of adhesive strength characteristics, curing time, asphalt application, test temperature which are liquid waterproofing membrane of rubber-asphalt and chloroprene-rubber type for concrete bridge deck. According to the results, curing time is shorter, adhesive strength is less in chloroprene-rubber type. And also chloroprene-rubber and rubber-asphalt type are showed high adhesive strength in low temperature.

• Bulletin of the Korean Chemical Society
• /
• v.29 no.11
• /
• pp.2264-2266
• /
• 2008

• Elastomers and Composites
• /
• v.54 no.1
• /
• pp.40-53
• /
• 2019

The physical properties of chloroprene rubber (CR) compounds reinforced with networked silicas were investigated by comparing them to those reinforced with conventional silica to observe the effect of the organic connection bonds combining silica particles on their cure, tensile, and aging performance. The introduction of networked silica to CR increase in silica content to 80 phr in rubber, while the content of conventional silica was limited to 60 phr. The CR compounds reinforced with networked silica showed higher resistance to combustion. The gradual increases in delta torque, Mooney viscosity, and modulus of silica-filled CR compounds with silica content were mainly attributed to the specific interaction between the chlorine atoms of CR and the hydroxyl groups of silica. The CR compounds reinforced with networked silica showed low compression set and heat build-up and maintained their high modulus even after thermal, oil, and ozone aging.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2000.10a
• /
• pp.473-478
• /
• 2000

This report describes practices currently used for properties, applications and guide-lines of Chloroprene Rubber Liquid Membrane System for concrete bridge deck and relates these practices to in-service failures.

• Elastomers and Composites
• /
• v.31 no.4
• /
• pp.256-271
• /
• 1996

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.25 no.6
• /
• pp.103-110
• /
• 2021

Elastomeric bearings composed of flexible rubber materials and steel reinforcement plates are widely used for seismic retrofit of bridges due to their excellent vertical stiffness and flexible lateral stiffness. Especially, it has the advantages of simple construction and low cost. Chloroprene rubber, a type of rubber material, has greater resistance to aging than natural rubber, but its performance is also degraded due to various deterioration factors. Although these aging characteristics are not reflected in the seismic design standards and seismic performance evaluation guidelines, it is reasonable to reflect this when related studies are accumulated. For chloroprene rubber, accelerated heat aging test was performed with variables of heating temperatures and exposure time to analyze shear characteristics. As aging progresses the maximum shear stress and shear strain decrease. Also, the shear stiffness is greatly increased at the same shear strain.

• Elastomers and Composites
• /
• v.8 no.2
• /
• pp.140-147
• /
• 1973

The influence of the adhesive force test conditions on the resultant adhesive force was measured using a chloroprene rubber as an adhesive and a plywood as an adherent. It was clarified from the experiments which adhesive force test conditions could influence strongly the adhesive force. After this, the constant values neccessary as the test conditions of the adhesive force in making generally a test of the adhesive force determined.

• Elastomers and Composites
• /
• v.32 no.5
• /
• pp.295-301
• /
• 1997

The effects of filler types and compositions on the final properties such as tensile strength, % elongation, hardness, and specific gravity of chloroprene rubber were investigated. The fillers involved in this investigation were HAF-type carbon black, Mistron, and white clay, For each filler, the variation of filler compositions gave almost the linear effects on the all properties investigated. For a fixed filler composition, different filler types gave different influential strength on rubber properties. After linearlization of experimental data with respect to each filler composition, the simple linear addition of each property with respect to filler compositions was applied to predict the final properties of the filler included rubber systems. For the chloroprene rubber system including the fillers composed of Mistron(25phr)/HAF(20phr)/clay(35phr), the predicted properties were well in accordance with the experimental results. Similar results were obtained for other additives such as processing oil and accelerator.