. "a device wherein n is a number of from about 5 to about 5,000; a device wherein n is a number of from about 5 to about 3,000; a device wherein n is a number of from about 5 to about 5,000; a device wherein R is hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, or pentadecyl, and the like; and m=1, x=y=2, z=0 or 1; a device wherein R is hexyl, heptyl, octyl, octyl, nonyl," . . .