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首页> 外文期刊>Journal of Applied Polymer Science >Morphology and Particle Size of Nanograde Polyurethane/Polyacrylate Hybrid Emulsions
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Morphology and Particle Size of Nanograde Polyurethane/Polyacrylate Hybrid Emulsions

机译：纳米级聚氨酯/聚丙烯酸酯杂化乳液的形貌和粒径

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摘要

Poly(urethane acrylate) (PUA) composite particles were prepared by seeded surfactant-free emulsion polymerization. The aqueous polyurethane (PU) dispersions were used as seed particles. The diameters of the seed particles of the aqueous PU dispersions and PUA composite latexes were measured by dynamic light scattering. The microstructures of the PUA composite emulsion particles were observed by transmission electron microscopy. The influences of the amount of the hydrophilic chain extender, the types of initiators, and the PU/polyacrylate (PA) weight ratios on the diameters of the aqueous PU and composite emulsions were also studied. The results showed that the PUA composite emulsions formed a core-shell structure with PU as the shell and with PA as the core. The diameter of the PU seed particles and the particle size of the PUA composite emulsions greatly depended on the amounts of the hydrophilic chain extender used in the preparation of the PU seed; when the hydrophilic chain extender concentration was 7.4%, the average diameter of the PUA composite emulsion particles showed the minimum value. The types of initiators and PU/PA weight ratios did not have a significant influence on the diameter of the PUA composite latex particles.
机译：通过无种子表面活性剂乳液聚合制备聚（丙烯酸聚氨酯）（PUA）复合颗粒。水性聚氨酯（PU）分散体用作种子颗粒。通过动态光散射测量水性PU分散体和PUA复合胶乳的种子颗粒的直径。通过透射电子显微镜观察PUA复合乳液颗粒的微观结构。还研究了亲水性扩链剂的量，引发剂的类型以及PU /聚丙烯酸酯（PA）重量比对水性PU和复合乳液直径的影响。结果表明，PUA复合乳液形成了以PU为壳，PA为核的核-壳结构。 PU种子颗粒的直径和PUA复合乳液的粒径在很大程度上取决于制备PU种子时使用的亲水性扩链剂的量。当亲水性扩链剂浓度为7.4％时，PUA复合乳液颗粒的平均直径显示出最小值。引发剂的类型和PU / PA重量比对PUA复合胶乳颗粒的直径没有显着影响。

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