two distinctive acrylate materials.xe2x80x9d
Like the first method, the polymerization process occurs in the same manner. The only difference is that the dye is not uniformly distributed throughout the HRM. Rather the dye is eventually distributed into a symmetrical concentration distribution, approximating an exponential distribution, wherein the concentration of the dye is greatest in the center of the HRM and the least concentrated at the edges.
Third Method
The third method is a variation of the first and second methods. The third method has two outer layers and an inner layer. The two outer layers comprise at least one monomer selected from the above-identified acrylate materials, and a polymerization initiator. The outer layers are formed in the same steps as the inner layer of the second method (not fully polymerized).
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