Abstract
The elastic modulus of silicone elastomers is greatly enhanced by the presence of fine particles (fillers). Exposure to high energy radiation offers a convenient method of introducing crosslinks in a quantitative manner. It is found that for a wide range of filler particles there is little linking between polymer and filler. The increase in modulus is proportional to dose (i.e. crosslink density) and to filler concentration, and is usually independent of the nature of the filler surface. However, it is inversely proportional to filler diameter. It is concluded that the increase is due primarily to physical interference of the filler particles with elastic deformation of the network.
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