| http://www.w3.org/ns/prov#value | - where b is an integer ranging from about 5 to about 200, and Ar5 and Ar6 can independently be aromatic or aliphatic, and preferably Ar6 is a divalent aromatic group, a divalent heterocyclic group, a divalent alicyclic group, a divalent aliphatic group that may contain silicon, or mixtures thereof, and Ar5 is a tetravalent aromatic group, a tetravalent heterocyclic group, a tetravalent cycloaliphat
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