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首页> 外文期刊>Journal of Applied Polymer Science >Morphology, dynamic rheology, and cohesive properties of epoxy-modified polyurethane-acrylate microemulsions prepared by in situ surfactant-free polymerization
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Morphology, dynamic rheology, and cohesive properties of epoxy-modified polyurethane-acrylate microemulsions prepared by in situ surfactant-free polymerization

机译：原位无表面活性剂聚合制备的环氧改性聚氨酯-丙烯酸酯微乳液的形貌，动态流变学和内聚性能

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摘要

A series of organic, solvent-free, epoxy-modified polyurethane-acryalte (EPUA) adhesives were prepared through in situ surfactant-free polymerization. Stable EPUA microemulsions with average particle diameters of less than 100 nm and a unimodal distribution were obtained through control of the epoxy content. Transitions from irregular shapes with a heterogeneous size distribution to a regular spherical particle morphology with an apparent core-shell morphology were obtained for EPUA with an increasing epoxy content to 8 wt %. With epoxy addition, EPUA displayed pseudoplastic behavior instead of Newtonian behavior, and increases in the viscosity and pseudoplastic behavior were detected. In addition, the EPUA emulsion transferred from a viscous liquid to a solidlike liquid. The addition of epoxy was beneficial for phase mixing, interaction, and entanglements between polyurethane and polyacrylate, and the interactions between the EPUA colloidal particles were also enhanced. The thermal stability, mechanical properties, and water and solvent resistance were thereby improved, as was the cohesive properties. However, the corresponding properties were weakened with excessive epoxy, and this was ascribed to the greatly increased particle size, viscosity, and phase separation.
机译：通过原位无表面活性剂聚合反应制备了一系列有机，无溶剂，环氧改性的聚氨酯-丙烯酸（EPUA）粘合剂。通过控制环氧含量，获得了平均粒径小于100 nm且单峰分布稳定的EPUA微乳液。对于EPUA，获得了从具有不均匀尺寸分布的不规则形状到具有明显核-壳形态的规则球形颗粒形态的转变，其中EPUA的环氧含量增加至8wt％。加入环氧后，EPUA表现出假塑性行为而不是牛顿行为，并且检测到粘度和假塑性行为增加。另外，EPUA乳液从粘性液体转移到固体状液体。环氧的添加有利于聚氨酯和聚丙烯酸酯之间的相混合，相互作用和缠结，并且还增强了EPUA胶体颗粒之间的相互作用。从而改善了热稳定性，机械性能以及耐水和耐溶剂性，以及内聚性能。但是，过量的环氧会削弱相应的性能，这归因于大大增加的粒度，粘度和相分离。

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