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By Paul T. Anastas, Lauren G. Heine, and Tracy C. Williamson (Eds.)

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These contaminants can comprise up to 50 atom-percent of the polymer material (7). Many of these contaminants are water soluble, such as metal chlorides and often fluorides. Table 1 lists the boiling points of the most common etch products. The organic structures are typically reacted to form CO, C 0 , and water products. Conventional ashing processes, which employ oxygen chemistry and operate at 250-300°C, result in oxidation of the metal constituents, thereby converting the original compounds to insoluble and refractory oxides trapped in the organic matrices.

However, our research has indicated the need to surface treat the particles. This will add to their price and increase the cost of the solventless process. If the surface treatment increased the particle price by 10%, then the overall cost of the solventless process would be $1616 per hour, higher than the cost of the solventbased process with recycle. However, our analysis for the solvent-based process does not include the cost of curing the tape. ; ACS Symposium Series; American Chemical Society: Washington, DC, 2000.

We assumed that the surface contains hydroxyl groups that can react with silanol groups from the coupling agent. This is standard silane coupling agent chemistry, with an important difference. The coupling agent chemistry worked out for fiberglass surfaces uses an acid catalyst, usually acetic acid. When the iron particles were exposed to these acid conditions they rapidly corroded. The key step in the reaction between the coupling agent and the particle surface was the hydrolysis of the methoxy groups.

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