Abstract
A family of poly(oxyalkylene)-segmented and urea-linkaged polymers were prepared from the reaction of isophorone diisocyanate (IPDI) or toluene-2,4-diisocyanate (TDI) and poly(oxyalkylene)diamines at 1:1 or 1: 2 molar ratio. Their structures were characterized by using IR and GPC. The chemical structures with respect to oxyalkylene backbone, terminal -NH 2 , uriedo linkage, weight fraction, and crystallinity of the involved poly(oxyethylene) segments were correlated to the measurement of surface resistivity. The oligomeric polyureas prepared from poly(oxyethylene)diamine generally had a lower surface resistivity than the starting amine due to the lowering crystallinity. The incorporation of poly(oxyethylene) segments proportionally increased hydrophilicity and consequently lowered surface resistivity as low as 10 7.4 Ω sq 1 in comparison with 10 9.8-10.0 Ω sq 1 for the semi-crystalline starting amines. Amine termination in oligomers also contributed to the lowering of surface resistivities. The comparisons between polyurethanes and polyureas further revealed the importance of hydrogen bonding involving mechanism for the electron transfers.
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