Structure-Coproperty study of waterborne, polyurethane acrylate dispersions based on hyperbranched aliphatic polyester for UV-curable coatings
Structure-Coproperty study of waterborne, polyurethane acrylate dispersions based on hyperbranched aliphatic polyester for UV-curable coatings
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DOI：
10.1007/s00396-004-1123-2
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发表时间：
2004-12-01
影响因子：
2.4
通讯作者：
Shi, WF
中科院分区：
文献类型：
--
作者：
Asif, A;Huang, CY;Shi, WF
以羟基功能化超支化脂肪族聚酯Boltorn H20为基础，合成了一系列水性超支化聚氨酯丙烯酸酯水分散体（WHPUDs），并用傅里叶变换红外光谱（FTIR）对其进行了表征。水溶液分散体具有静电稳定性，其结构中含有羧基，并被三乙胺（TEA）中和。研究了端基的化学结构对whpud的粒径、界面张力和流变性能等性能的影响。用激光散射法测定了水相分散体的平均粒径为43 237 nm。随着分散介质中羧基含量、中和度和介电常数的增大，稳定部位增大，颗粒尺寸减小。随着TEA/ COOH摩尔比和中和度的增加，WHPUDs水相分散体的表面张力降低。对whpud的流变性能的研究表明，所有的分散体都属于假塑性流体，它们的粘度都比商用水基树脂eb2002低得多。
A series of waterborne, hyperbranched polyurethane acrylates for aqueous dispersions (WHPUDs) based on hydroxy-functionalized hyperbranched aliphatic polyester Boltorn H20 were synthesized and characterized by Fourier transform infrared spectroscopy ( FTIR). The aqueous dispersions were electrostatically stabilized with carboxyl groups incorporated into their structures, which were neutralized by triethylamine ( TEA). The effects of chemical structures of end groups on various properties of WHPUDs, such as particle size, interfacial tension, and rheological behavior were investigated. The average particle sizes of aqueous dispersions, 43 237 nm, were determined by laser light scattering. Owing to the enlargement of the stabilization site, the particle size decreased as the content of carboxyl group, degree of neutralization, and dielectric constant of the dispersion medium increased. Moreover, the surface tension of aqueous dispersions of WHPUDs decreased as the TEA/ COOH mole ratio and degree of neutralization increased. The investigations of the rheological behavior of the WHPUDs suggested that all the dispersions belong to pseudoplastic fluids, and each of them has viscosity much lower compared with the commercial water-based resin EB 2002.