Polymer00017 - Figure 1.3 Illustration of the function of...

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6 Besides nanoclay, nanosilica and graphite are two other important reinforcing nanofillers. The surface of the nanosilica is often treated to increase its compatibility with the polymer matrix and hence to improve mechanical properties of the nanocomposites. There are several ways to modify silica nano particles and graphite. For example, as shown in Figure 1.3, the silica nano particles (Xu and Chung 1999) and the matrix can be coupled with silane, where the functional group (in this case, the amino group) attaches to an organic resin (matrix) while the functional groups (X) attach to inorganic material (silica) to achieve a ―coupling‖ effect. Organic Matrix Amino Si x x x Silica
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Unformatted text preview: Figure 1.3 Illustration of the function of silane coupling agent. 1.4 Crosslinking Mechanisms and Cure Kinetics 1.4.1 Curing of Natural Rubbers Peroxide and sulfur are the most widely used crosslinking agents for uncured natural elastomers. The chemical reaction consisting in the addition of sulfur to the double bonds of the rubber molecules are always involved in the vulcanization of rubber with sulfur, which constantly forms the three dimensional networks (Lewis, et al. 1937). For peroxide curing, the free radical produced by peroxide is the driving force for peroxide crosslinking, which is much faster than sulfur cure. Free radicals are atoms or molecular...
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This note was uploaded on 08/18/2011 for the course MATSE 447 taught by Professor Colby,r during the Spring '08 term at Penn State.

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