Preparation and characterization of waterborne poly(urethane urea) with well‐defined hard segments
Preparation and characterization of waterborne poly(urethane urea) with well‐defined hard segments
复制标题
DOI：
10.1002/pola.20732
复制
发表时间：
2005-06
期刊：
影响因子：
--
通讯作者：
D. Yang;C. Hu;S. Ying
中科院分区：
文献类型：
--
作者：
D. Yang;C. Hu;S. Ying
以聚酯多元醇、4，4 '-二苯甲烷二异氰酸酯、二羟甲基丙酸、1，4-丁二醇、异氟尔酮二异氰酸酯和乙二胺为原料，制备了一系列具有明确硬段的聚酯基聚氨酯脲（PUU）水分散体。这些阴离子型水分散体在水中具有良好的分散性，并且在室温下稳定超过1年。对于这些水分散体，粒径随着硬段含量的增加而减小，并且多分散指数非常窄（<1.10）。用PUU水分散液制备的膜具有优异的防水性能：吸水量低至5.0wt%，并且水在这种膜的表面上的接触角高达103（这导致疏水表面）。这些水性PUU膜的耐水性能可以很好地关联到一些微晶和明确定义的硬段之间的氢键和氨基甲酸酯/酯基团形成的有序结构，以及在PUU系统中的硬段和软段之间的微相分离的程度。
A series of polyester-based poly(urethane urea) (PUU) aqueous dispersions with well-defined hard segments were prepared from polyester polyol, 4,4'-diphenylmethane diisocyanate, dimethylolpropionic acid, 1,4-butanediol, isophorone diisocyanate, and ethylenediamine. These anionic-type aqueous dispersions had good dispersity in water and were stable at the ambient temperature for more than 1 year. For these aqueous dispersions, the particle size decreased as the hard-segment content increased, and the polydispersity index was very narrow (<1.10). Films prepared with the PUU aqueous dispersions exhibited excellent waterproof performance: the amount of water absorption was as low as 5.0 wt %, and the contact angle of water on the surface of this kind of film was as high as 103 (this led to a hydrophobic surface). The water-resistant property of these waterborne PUU films could be well correlated with some crystallites and ordered structures of the well-defined hard segments formed by hydrogen bonding between the urethane/urethane groups and urethane/ester groups, as well as the degree of microphase separation between the hard and soft segments in the PUU systems.