| http://www.w3.org/ns/prov#value | - In general, it is preferred to use silicon-containing polymers having repeating units of the general formula: wherein X is a heteroatom, such as 0, S, N, Si or one or more carbon atoms either as part of an aliphatic or aromatic group and R is hydrogen or an organic group, and preferably hydrogen, alkyl, aryl, cycloalkyl, alkoxy, aryloxy or cycloalkoxy.
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