Waterborne polyurethanes (PUs) were hydrophobically modified using various types of acrylate monomers. PUs having hydroxy ethylacrylate (HEA) terminal groups were first obtained following a prepolymer mixing process. These PU base polymers were then chain extended with acrylate monomers via a radical polymerization mechanism. The effect of the overall composition, base polymer molecular weight, and type of acrylate were studied in terms of water swell and contact angle, as well as mechanical and dynamic mechanical properties of the emulsion cast film. It was found that water resistance, hardness, modulus, and tensile strength of the waterborne PU can be dramatically increased by acrylate incorporation. The reinforcing effect was more pronounced with multifunctional monomers, probably due to the crosslinking effect. (C) 1995 John Wiley & Sons, Inc. [References: 18]
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机译：使用各种类型的丙烯酸酯单体对水性聚氨酯（PU）进行疏水改性。在预聚物混合过程之后，首先获得具有丙烯酸羟乙酯（HEA）端基的PU。然后，这些PU基础聚合物通过自由基聚合机理与丙烯酸酯单体进行链增长。从水溶胀度和接触角以及乳液流延膜的机械和动态机械性能方面研究了整体组成，基础聚合物分子量和丙烯酸酯类型的影响。已经发现，通过掺入丙烯酸酯可以显着提高水性PU的耐水性，硬度，模量和拉伸强度。可能由于交联作用，多官能单体的增强作用更加明显。 （C）1995 John Wiley＆Sons，Inc. [参考：18]
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