Silicone rubber is a linear molecular structure of high molecular weight polyorganosiloxane, the general formula is:
n represents the degree of polymerization, R’ reprsents alkyl or hydroxyl, R represents methyl, R is typically methyl, ethyl, alkenyl, phenyl and trifluoropropyl groups. The introduction of the group depends on the desired properties of the silicone rubber, for example, introduction of a trifluoropropyl group in order to improve the oil resistance, and the introduction of phenylene group to improve the heat resistance.
As the polyorganosiloxane intermolecular force is small, the physical properties of the vulcanized raw rubber is poor, after adding reinforcing filler, it can improve its physical properties greatly, such as reinforcement, the vulcanized rubber can be increased by 20 ~ 30 times. It should be stressed that the different filler quality affect the strength of silicone rubber significantly. The current main filler is white carbon black, one is obtained by the gas phase method, the other is obtained by the precipitation method, both are different in the electrical properties and thermal stability, and the quality of gas phase method white carbon black is better than precipitation method. At the same time, even with the same kind of white carbon black, the fineness of particles, the shape of particles, the size of surface area, the content of impurities and the value of different reinforcing effect and the performance of the compound and heat resistance are different. In addition, with the dosage of filler increases, the silicone rubber hardness also increases, the breaking elongation decreases, and its tensile strength has a maximum value.
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Fiberglass fabric coated with silicone rubber.pdf