Influence of Molecular Weight Distributions on HEUR Aqueous Solution Rheology1

摘要: Two series of hydrophobe-modified, ethoxylated urethane (HEUR) polymers were synthesized. The first was prepared by the step-growth (S-G) polymerization poly(oxyethylene) (POE) Mn = 6000, with a slight excess different aliphatic diisocyanates in 4.2 to 3.2 mole ratio produce S-G polymer ∼20 000. terminal isocyanate groups reacted alkylamines hydrocarbon chain lengths. second produced reacting POE 20 000 large diisocyanate functionality, followed reaction alkylamines. molecular weight distribution narrow compared series, polymerization. length alkylamine, coupling diisocyanate, and distributions systematically varied proper choice synthetic conditions. changes structures correlated rheological behavior aq...