Aqueous particulate foams stabilized solely with polymer latex particles
Aqueous particulate foams stabilized solely with polymer latex particles
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DOI：
10.1021/la060812u
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发表时间：
2006-08-29
期刊：
影响因子：
3.9
通讯作者：
Armes, S. P.
中科院分区：
文献类型：
--
作者：
Fujii, S.;Iddon, P. D.;Armes, S. P.
在这篇文章中，广泛的胶乳被评为可能的泡沫稳定剂。这些乳液包括直径从170 nm到1.62微米的近单分散的聚(N-乙烯基吡咯烷酮)稳定的聚苯乙烯[PNVP-PS]乳液，亚微米尺寸的聚乙二醇稳定的聚苯乙烯[PEGMA-PS]乳液粒子，平均直径870 nm的PNVP稳定的聚(4-溴苯乙烯)[PNVP-PBRS]乳液，两个PNVP稳定的聚(甲基；PNVP-PMMA胶乳的平均直径为730 nm和1.20微米，PNVP稳定的聚(甲基丙烯酸羟丙酯)[PNVP-PHPMA]胶乳的平均直径为630 nm，电荷稳定的阴离子PS胶乳的平均直径为220 nm。详细研究了不同粒径、不同胶乳浓度、不同胶乳表面组成对泡沫稳定性的影响。较大的PNVP-PS乳液、PNVP-PBRS和两种PNVP-PMMA乳液产生的泡沫非常稳定，而PEGMA-PS、PNVP-PHPMA和电荷稳定的PS乳液既不产生泡沫，也不产生泡沫，但长期稳定性较差。扫描电子显微镜研究显示，干燥泡沫的壁上排列着六角形紧密堆积的乳胶阵列，这导致光学显微镜可以观察到局部的莫尔图案。此外，这些干燥的泡沫在明亮的透射光中具有高度的虹彩。
In this article, a wide range of latexes are evaluated as possible foam stabilizers. These include near-monodisperse, poly(N-vinyl pyrrolidone)-stabilized polystyrene [PNVP-PS] latexes with diameters ranging from 170 nm to 1.62 mu m, submicrometer-sized poly(ethylene glycol)-stabilized polystyrene [PEGMA-PS] latex particles, a PNVP-stabilized poly(4-bromostyrene) [PNVP-PBrS] latex with a mean diameter of 870 nm, two PNVP-stabilized poly(methyl ;methacrylate) [PNVP-PMMA] latexes with mean diameters of 730 nm and 1.20 mu m, a PNVP-stabilized poly(2-hydroxypropyl methacrylate) [PNVP-PHPMA] latex with a mean diameter of 630 nm, and a charge-stabilized anionic PS latex of 220 nm diameter. The effect of varying the particle size, latex concentration, and latex surface composition on foam stability were studied in detail. The larger PNVP-PS latexes, the PNVP-PBrS, and the two PNVP-PMMA latexes gave highly stable foams, whereas PEGMA-PS, PNVP-PHPMA, and the charge-stabilized PS latex produced either no foams or foams with inferior long-term stabilities. Scanning electron microscopy studies revealed hexagonally close-packed latex arrays in the walls of the dried foam, which leads to localized moire patterns being observed by optical microscopy. Moreover, these dried foams are highly iridescent in bright transmitted light.