Non-limiting examples of monoepoxy capping agents which are suitable for use in the invention include: wherein R and R2 are the same or different and are a branched or linear alkyl, cycloalkyl, polyoxyalkyl, or alkenyl group having 2-100 carbon atoms, optionally branched,; and R1 is hydrogen or a branched or unbranched alkyl having 1-18 carbon atoms.