Abstract
Three series of RAE block polymers with a general formula, CnAxEy [R : C4C12, A : 1, 2- epoxybutane (BO), styrene oxide (SO), and phenyl glycidyl ether (PGE), x : 211, E : ethylene oxide (EO), y : 540] were prepared by the usnal polyoxyethylatioa of the prodncts obtained by the polyaddition of A to long chain alcohols under the following conditions, catalyst : metallic K, temperature : 110150°C, pressure in N2 atmosphere : 24 atm. The base catalyzed addition of SO mainly gave normal ring-opening products (secondary alcohols). The least EO content required to give a water-soluble product was 3040% for BO series and 45 50% for SO, PGE series. Hydrophobicity of A block was found to increase in the order, propyleae oxide<BO<SO≈PGE, based on the relationship between cloud point and EO content of the products. With respect to surface-tension lowering, foaming and wettiag, BO series showed high ability close to that of alkyl poly (oxyethylene) ethers (CnEy), but, many of PGE series were less efficient. Some of SO amld PGE series with aromatic rings in the A block had a good suspending power for carbon and phthalocyanine. In emulsifying power for xylene, RAE polymers were superior to CnEy and Pluranics. Some discussions were presented on the relation of the structure in RAE polymer to the surfactant properties.
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