Colloidal stability of surfactant-free radiation curable polyurethane dispersions
Colloidal stability of surfactant-free radiation curable polyurethane dispersions
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DOI：
10.1016/j.porgcoat.2005.08.010
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发表时间：
2006-02-01
影响因子：
6.6
通讯作者：
Vanovervelt, JC
中科院分区：
文献类型：
--
作者：
Tielemans, M;Roose, P;Vanovervelt, JC
辐射固化聚氨酯分散体（UV-PUD）是胶体分散体，其稳定性主要通过带负电的聚合物颗粒之间的静电斥力来保证。在本文中，颗粒稳定性是根据聚合物分散体的物理化学特性及其微观结构来介绍的。通过多重光散射研究了较高温度下胶体不稳定的现象，然后与粒度分布的演变以及盐的表观临界凝结浓度的测量相关联，作为颗粒表面能量势垒的指示。对聚合物的选定化学参数对胶体稳定性的影响的研究旨在确定最相关的参数，并了解潜在的机制。该研究强调，UV-PUD 构成了一个具有自己特性的水性聚合物家族，增加了传统辐射固化化学的复杂性。最后，它强调了为具有高端性能和扩展稳定性和鲁棒性的新型环保产品提供的新视角。 (c) 2005 Elsevier B.V. 保留所有权利。
Radiation-curable polyurethane dispersions (UV-PUDs) are colloidal dispersions whose stability is mainly ensured by the electrostatic repulsion between the negatively charged polymer particles. In this article, particle stabilization is presented in terms of the physico-chemical characteristics of the polymer dispersion and its microstructure. The phenomenon of the colloidal destabilization at higher temperature is studied by multiple light scattering, then correlated with the evolution of the particle size distributions and the measurement of the apparent critical coagulation concentration of a salt as an indication of the energy barrier at the surface of the particles. The investigation of selected chemical parameters of the polymer on the colloidal stability aims to identify the most relevant ones with an understanding of the underlying mechanism. The study underlines that UV-PUDs constitute a waterborne polymer family with its own identity, adding complexity to the traditional radiation curing chemistry. Finally, it highlights the new perspectives offered for novel environmental-friendly products with high-end performance and extended stability and robustness. (c) 2005 Elsevier B.V. All rights reserved.