Polymerizable Hydrophobically Modified Ethoxylated Urethane Acrylate Polymer: Synthesis and Viscoelastic Behavior in Aqueous Systems,Macromolecules

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Polymerizable Hydrophobically Modified Ethoxylated Urethane Acrylate Polymer: Synthesis and Viscoelastic Behavior in Aqueous Systems
Macromolecules ( IF 5.1 ) Pub Date : 2020-08-24 , DOI: 10.1021/acs.macromol.0c00982
Tao Guan ₁ , Zhukang Du ₂ , Jun Peng ₁ , Dongli Zhao ₁ , Ning Sun ₃ , Biye Ren ₁

Affiliation

Hydrophobically modified ethoxylated urethanes (HEURs) comprising hydrophilic poly(ethylene glycol) backbone and hydrophobic end groups are widely applied as rheological additives to regulate the viscoelastic behavior of waterborne systems such as coatings and inks. However, the conventional HEURs are usually nonreactive and remain free in final films, which may bring some defects and damages to the final cured films during the service time. An appealing way to improve filming properties may be to design reactive HEURs, which can participate in the post-crosslinking reactions with other components in formula during the film curing. In this work, a polymerizable acrylic-type HEUR (acrylic-HEUR) end-functionalized by the reactive methacrylate group and hydrophobic octadecyl tail is reported. The typical free radical polymerization feature of acrylic-HEUR based on the highly reactive methacrylate group is carefully clarified by dynamic light scattering, in situ nuclear magnetic resonance (¹H NMR), and rheological measurements. The excellent thickening performance of acrylic-HEUR in waterborne UV emulsions and its effective copolymerization reactivity with the UV-curable matrix resin are demonstrated by in situ rheological measurements under UV irradiation in detail. Compared to conventional nonreactive HEURs, the copolymerization reactivity of acrylic-HEUR may make it especially suitable for applications in waterborne UV coatings to avoid its migration from final UV-cured films. This work may not only open a new perspective for the fabrication of HEUR polymers with high chemical reactivity but also promise the potential of polymerizable HEURs as superior associative thickeners in industry.

中文翻译：

可聚合的疏水改性的乙氧基化氨基甲酸乙酯丙烯酸酯聚合物：水性体系的合成和粘弹性行为

包含亲水性聚乙二醇主链和疏水端基的疏水改性乙氧基化氨基甲酸酯（HEUR）被广泛用作流变添加剂，以调节水性体系（如涂料和油墨）的粘弹性行为。然而，常规的HEUR通常是不反应的，并且在最终膜中保持游离，这可能会在使用期间给最终固化的膜带来一些缺陷和损坏。改善成膜性能的一种吸引人的方法可能是设计反应性HEUR，它们可以参与膜固化过程中与配方中其他组分的后交联反应。在这项工作中，已报道了由反应性甲基丙烯酸酯基团和疏水性十八烷基尾端官能化的可聚合丙烯酸型HEUR（acrylic-HEUR）。原位核磁共振（¹ H NMR）和流变学测量。丙烯酸-HEUR在水性紫外线乳液中的优异增稠性能及其与紫外线可固化基体树脂的有效共聚反应性已通过在紫外线照射下进行的原位流变测量得到了详细证明。与传统的非反应性HEUR相比，丙烯酸-HEUR的共聚反应性使其特别适用于水性UV涂料，从而避免了其从最终的UV固化膜中迁移出来的情况。这项工作不仅可以为制备具有高化学反应性的HEUR聚合物开辟新的视野，而且有望将可聚合的HEURs用作工业上优良的缔合增稠剂的潜力。

更新日期：2020-09-09

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