| http://www.w3.org/ns/prov#value | - Preferred chain extenders are the diols having the formula HO(CH2)i OH in which i is an integer of 2 to 12; glycols of the formula HO(--CH2 O--)j 13 H, in which j is an integer of 1 to 6; glycols of the formula HO--(CH(CH3)CH2 O--)k --H, in which k is an integer of 1 to 4, e.g. ethylene glycol, propylene glycol, diethylene glycol, diisopropylene glycol, and the like, and 2,2-dimethyl-1,3-propanedi
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