| http://www.w3.org/ns/prov#value | - A cross-linked product as claimed in claim 3 wherein the substituted divalent hydrocarbyl group is (??--X--??)p wherein ?? is the phenylene group; X, each of which are the same or different, represents --O--, --SO2 --, --CONH--, or --CO--; and p is an integer from 0 to 15.
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