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http://dx.doi.org/10.7473/EC.2019.54.2.142

Effects of Inorganic Fillers on Mechanical Properties of Silicone Rubber  

Kim, Gyu Tae (Department of Chemical Engineering, Keimyung University)
Lee, Young Seok (Jinyang Oilseal Co., Ltd.)
Ha, KiRyong (Department of Chemical Engineering, Keimyung University)
Publication Information
Elastomers and Composites / v.54, no.2, 2019 , pp. 142-148 More about this Journal
Abstract
In this study, the effects of filler particle size and shape on the physical properties of silicone rubber composites were investigated using inorganic fillers (Minusil 5, Celite 219, and Nyad 400) except silica, which was already present as a reinforcing filler of silicone rubber. Fillers with small particle sizes are known to facilitate the formation of the bound rubber by increasing the contact area with the polymer. However, in this experiment, the bound rubber content of Celite 219-added silicone composite was higher than that of Minusil 5-added silicone composite. This was attributed to the porous structure of Celite 219, which led to an increase in the internal surface area of the filler. When the inorganic fillers were added, both thermal decomposition temperature and thermal stability were improved. The bound rubber formed between the silicone rubber and inorganic filler affected the degree of crosslinking of the silicone composite. It is well-known that as the size of the reinforcing filler decreases, the reinforcing effect increases. However, in this experiment, the hardness of the composite material filled with Celite 219 was the highest compared to the other three composites. Furthermore, the highest value of 2.19 MPa was observed for 100% modulus, and the fracture elongation was the lowest at 469%. This was a result of excellent interaction between Celite 219 filler and silicone rubber.
Keywords
silicone rubber; inorganic fillers; mechanical properties; bound rubber; composite;
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Times Cited By KSCI : 8  (Citation Analysis)
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