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Gloves
Published in Robert N. Phalen, Howard I. Maibach, Protective Gloves for Occupational Use, 2023
Marie-Noëlle Crépy, Pierre Hoerner
Silicone rubber is very inert and offers unprecedented insulative properties and thermal stability. Silicone is however not widely used for gloves, except for gloves intended to be exposed to high temperatures.
Trends in Polymer Applications
Published in Manas Chanda, Plastics Technology Handbook, 2017
Silicone rubber is a highly biocompatible thermosetting elastomer that has found applications in prosthesis for ophthalmology, neurology, facial reconstruction, replacement of finger, toe and wrist joints, cardiovascular applications, such as pacemaker coatings and lead wires, and tendon replacements. It is also used in drug delivery systems and tubes for carrying blood, drugs, and nutrients.
Recent Developments in Rubber–Rubber and Rubber–Plastics Blends
Published in Anil K. Bhowmick, Current Topics in ELASTOMERS RESEARCH, 2008
Duryodhan Mangaraj, Alice Bope Parsons
Whereas fluoroelastomers based on tetrafluoro-ethylene/propylene/vinylidene fluoride are highly oil-resistant and strong, their low-temperature flexibility is limited. Silicone rubber, on the other hand, excels in high-temperature stability, low-temperature flexibility, chemical resistance, weatherability, electrical performance, and sealing capability. Hence, blends of silicone rubber with fluoroelastomer have the potential for providing useful performance and potential for replacing very costly fluorosilicone rubber. Ghosh and De have studied morphology as well as performance properties of elastomer blends based on fluoroelastomer (Aflas 200) and silicone rubber (SE 0075) [24]. They prepared five different compounds containing 0%–100% of the two elastomers along with dicumyl peroxide (DCP) as the curing agent and triallyoxy cyanurate and calcium hydroxide as additives. Fluorosilicone rubber was also compounded in the similar manner. The compounds were mixed in a Barbender plasticorder at 80°C, sheeted out in a two-roll mill, and cured at 170°C for cure times as determined by the Monsanto rheometer. They measured a variety of blend properties including die swell and surface roughness of the extruded specimens, morphology of the blends by scanning electron microscopy (SEM) and atomic force microscopy (AFM), surface energy by contact angle meter, thermal properties by TGA, limiting oxygen index, mechanical properties, and hot oil aging resistance. They found that the blends exhibit shear viscosity close to that of silicone rubber, especially at 50% and 75% silicone rubber, and a little smaller than silicone rubber at higher shear rate. The die swell of the blends is much higher than the values calculated on the basis of the additivity rule. This has been attributed to the fact that in the blend, the fluororubber is dispersed in the continuous matrix of silicone rubber, and the higher the volume fraction of fluororubber, the higher is the amount of stored elastic energy during capillary flow, and greater the deviation from the additivity rule.
Developing an analytical solution for a thermally tunable soft actuator under finite bending
Published in Mechanics Based Design of Structures and Machines, 2022
Ebrahim Yarali, Reza Noroozi, Ali Moallemi, Ali Taheri, Mostafa Baghani
Silicone rubber is a rubber like-polymer, which endures large deformations without any change in its properties. Thus, silicone rubber is used in numerical analyses. In order to calibrate material parameters, experimental results reported by (Mansouri, Darijani, and Baghani 2017) are employed. It is noted that the glass transition temperature of the silicone rubber is around −35 °C (Molnár and Huba 2001). It means within the temperature ranges of the proposed actuator (over than 27 °C), the actuator is in its rubbery phase. In other words, since the actuator works within the temperature ranges of 27–100 °C, it is expected that the stiffness of the rubber is not changed dramatically. Therefore, silicone rubber is a suitable material to analyze thermo-elastic problems by considering this assumption that the elastic properties are independent from the temperature. Table 1 lists necessary material parameters for mentioned constitutive models.
The effect of gamma irradiation on the electrical and mechanical properties of bismuth carbonate-silicone rubber
Published in Radiation Effects and Defects in Solids, 2022
Silicone rubbers are chemically synthesized with other elements such as carbon, hydrogen, and oxygen. They have the main chain of inorganic siloxane linkage (Si-O-Si) plus side chains. This siloxane bond has greater capacity and stability. Its molecules are helical, and the very low intermolecular force makes it very elastic and high compressibility. They are hybrid polymers that contain both inorganic and organic components. Silicone rubber has excellent resistant to extreme environments and temperatures from -55 °C to +300 °C. It can withstand for over 10,000 h while still maintaining its useful properties. As a result, silicone rubber has better heat resistance, chemical stability, and electrical conductivity than any other ordinary organic rubber. The mechanical properties of silicone rubber are relatively poor in the absence of reinforcing fillers. So, heavy elements can be doped to enhance the properties of silicones (10). Based on the used additives, platinum-cured silicone rubber has a dielectric constant ranging from 2.81-3.56, and the electrical conductivity ranged from 0.000154 - 0.000622 S/m at 127 MHz, while condensation-cured silicone rubber has a dielectric constant ranging from 3.65-3.70, and the electrical conductivity ranged from 0.000263-and 0.000347 S/m (11).
A study on mechanical and tribological properties of silicone rubber reinforced with white carbon black
Published in Tribology - Materials, Surfaces & Interfaces, 2018
Qiang He, Anling Li, Yong Zhang, Songfeng Liu, Yachen Guo, Linghao Kong
The strength performance of silicone rubber without reinforcement is extremely poor. Therefore, we expect to obtain the good mechanical properties of vulcanised rubber such as tensile strength, tear strength, elongation rate and shore hardness through the adding of reinforcing filler. White carbon black, which can be divided into fumed silica and precipitated silica, was effective reinforced filler for silicone rubber. However, both fumed silica and precipitated silica exhibit different reinforcement effect due to different methods of preparation. The effect of white carbon black on the mechanical properties of silicone rubber was briefly described to compare the reinforcing effect of different white carbon black on silicone rubber.