Abstract: Waterborne polyurethane (PU) aqueous dispersions were prepared by the modification with butyl acrylate (BA) and 2-hydroxyethyl methacrylate (HEMA)，in which the PU was synthesized from isophorone diisocyanate (IPDI) with dihydroxymethylpropionic acid (DMPA) as the hard segment and polyether polyols (N220) as the soft segment. The physical and mechanical properties of the prepared aqueous dispersions and membranes were investigated. Results showed that the modified PU has a larger particle size，a smaller surface tension and improved mechanical properties and hardness as compared with the unmodified PU. The introduction of HEMA resulted in the formation of a chemical crosslinked core–shell interpenetrating polymer network structure，indicating that the hard segment of PU has a higher molecular chain compatibility with the acrylic polymers in the modified materials.

摘要： 以异佛尔酮二异氰酸酯（IPDI）、二羟甲基丙酸（DMPA）为硬段，聚醚多元醇（N220）为软段，以丙烯酸丁酯（BA）和甲基丙烯酸羟乙酯（HEMA）改性，制备了水性聚氨酯（PU）分散液，测定了水分散液及其膜的物理性能和力学性能。结果表明，与未改性的PU水分散液相比，改性聚氨酯水分散液的粒径均有所增大，表面张力减小，力学性能和硬度提高。HEMA 的引入，形成了具有化学交联的核-壳互穿网络结构的聚合物，说明改性材料中分子链硬段与PA分子链具有较高的相容性。