使用可聚合聚氨酯大分子表面活性剂合成聚 HIPE 并确定其特性

IF 2.2 4区 化学 Q3 CHEMISTRY, PHYSICAL
Xu Hou, Le Chang, Chenxuan Zheng, Huarong Liu
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引用次数: 0

摘要

高内相乳液(HIPE)通常由大量表面活性剂稳定,这些表面活性剂应在连续相聚合后去除,而由 W/O HIPE 生成的聚 HIPE 通常较脆且呈白垩状。在此,我们报告了一种通过二异氰酸酯和多元醇的加成反应合成的两亲可聚合聚氨酯(PPU)大分子表面活性剂,它可以很好地稳定油相含量仅为 5 wt% 的 W/O 型 HIPE(内相体积高达 88%)。与使用传统表面活性剂 Span 80 稳定的 HIPE 相比,在室温或 70 °C 下使用 PPU 稳定的 HIPE 更加稳定,这是因为 PPU 增加了粘度,可以抑制液滴凝聚。此外,得到的聚 HIPE 不仅机械性能比使用 Span 80 稳定的聚 HIPE 高出数倍,而且弹性也更高。研究了 PPU 浓度对所得聚 HIPE 形状和机械性能的影响。结果发现,随着 PPU 含量的增加,平均空隙和窗口尺寸减小,而压缩强度增加。图解摘要通过二异氰酸酯和多元醇的加成反应合成的可聚合聚氨酯大分子表面活性剂(PPU)可单独稳定高内相乳液(HIPE),而用 PPU 稳定的 HIPE 聚合生成的高互联大孔聚合物(称为 polyHIPE)可承受大变形压缩,且无可见裂缝。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Synthesis and characterization of polyHIPEs using a polymerizable polyurethane macromolecular surfactant

Synthesis and characterization of polyHIPEs using a polymerizable polyurethane macromolecular surfactant

High internal phase emulsions (HIPEs) are commonly stabilized by a large amount of surfactants that should be removed after the polymerization of the continuous phase, and the resulting polyHIPEs from W/O HIPEs are usually brittle and chalky. Herein we report on an amphiphilic polymerizable polyurethane (PPU) macromolecular surfactant synthesized by polyaddition reaction of diisocyanates and polyols, which can well stabilize up to 88% internal phase volume of W/O HIPE with a content of only 5 wt% based the oil phase. Compared with the HIPEs stabilized by traditional surfactant Span 80, HIPEs stabilized by PPU at either room temperature or 70 °C are much more stable owing to the increased viscosity which can inhibit droplet coalescence. Moreover, the resulting polyHIPEs not only have several times higher mechanical properties than those stabilized by Span 80 but also have higher elasticity. The effects of concentration of PPU on the morphology and mechanical properties of the resulting polyHIPEs were investigated. It was found that with the increase of PPU content, the average void and window sizes decreased, while the compression strength increased. Cyclic compression tests were performed to examine reversible compressibility and durability of these polyHIPEs.

Graphical abstract

The polymerizable polyurethane macromolecular surfactant (PPU) synthesized through the polyaddition reaction of diisocyanates and polyols can solely stabilize high internal phase emulsions (HIPEs), and highly interconnected macroporous polymer produced by the polymerization of HIPE stabilized with PPU, known as polyHIPE, can withstand large deformation compression with no visible cracks.

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来源期刊
Colloid and Polymer Science
Colloid and Polymer Science 化学-高分子科学
CiteScore
4.60
自引率
4.20%
发文量
111
审稿时长
2.2 months
期刊介绍: Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.
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