ASA-in-water emulsions stabilized by laponite nanoparticles modified with tetramethylammonium chloride
ASA-in-water emulsions stabilized by laponite nanoparticles modified with tetramethylammonium chloride
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由四甲基氯化铵改性的合成锂皂石纳米颗粒稳定的 ASA 水包乳液
DOI：
10.1016/j.ces.2014.06.005
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发表时间：
2014-09
影响因子：
4.7
通讯作者：
Li, Guodong
中科院分区：
文献类型：
--
作者：
Gong, Bei;Zhang, Wei;Wang, Huili;Li, Guodong
烯基琥珀酸酐（阿萨）是一种广泛使用的纸张施胶剂，其以水包油（o/w）乳液的形式施用，以赋予所得纸张防水特性。为了获得稳定的阿萨o/w乳液，在用氯化四甲基铵（TMAC）（一种具有尽可能短的烃基团的季铵盐）改性后，选择锂皂石（一种高度亲水性的合成粘土）作为稳定剂。结果表明，TMAC适度中和了合成锂皂石颗粒的负电荷，降低了合成锂皂石水分散体的表观粘度，但通过提高合成锂皂石颗粒的疏水性，增加了合成锂皂石水分散体的浊度，有利于合成锂皂石颗粒在ASA-水界面上的吸附。同时，TMAC显着降低阿萨和水/水性锂皂石分散体之间的界面张力，促进形成具有小液滴的乳液。当TMAC的加入量达到laponite的1wt%时，所制备的阿萨乳液具有小的液滴尺寸、低的粘度和均匀的液滴尺寸分布，并且表现出良好的乳化/聚结稳定性。采用TMAC对合成锂皂石纳米粒子进行改性，提高了阿萨乳液的水解稳定性和施胶性能。
Alkenyl succinic anhydride (ASA) is a widely used paper sizing agent that is applied in the form of oil-in-water (o/w) emulsions in order to impart a water-resistant character to the resulting paper. To obtain stable o/w emulsions of ASA, laponite, a highly hydrophilic synthetic clay, was selected as the stabilizer after it had been modified with tetramethylammonium chloride (TMAC), a quaternary ammonium salt with the shortest possible hydrocarbon groups. It was found that the TMAC moderately neutralized the negative charges of laponite particles, lowered the apparent viscosity, but enhanced the turbidity of laponite aqueous dispersion by enhancing the hydrophobicity of the laponite particles, favoring adsorption of laponite particles on the ASA–water interface. Meanwhile, the TMAC significantly decreased the interfacial tension between ASA and water/aqueous laponite dispersion, promoting the formation of an emulsion with small droplets. When the added amount of TMAC reached 1 wt% based on laponite, the as-prepared ASA emulsion had small droplet size, low viscosity and uniform droplet size distribution, and exhibited good creaming/coalescence stability. By using TMAC to modify laponite nanoparticles, the hydrolysis stability and sizing performance of ASA emulsion were also improved.
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影响因子：
9.9
作者：
R. Perkins;R. Brace;E. Matijević
通讯作者：
R. Perkins;R. Brace;E. Matijević
影响因子：
3.3
作者：
Binks, BP;Lumsdon, SO
通讯作者：
Lumsdon, SO
DOI：
10.1016/j.colsurfa.2004.10.116
发表时间：
2005-02-01
影响因子：
5.2
作者：
Binks, BP;Whitby, CP
通讯作者：
Whitby, CP
DOI：
10.1016/j.colsurfa.2008.06.035
发表时间：
2008-10
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子：
--
作者：
J. Labanda;J. Llorens
通讯作者：
J. Labanda;J. Llorens
影响因子：
0.6
作者：
J. M. Gess;D. S. Rende
通讯作者：
J. M. Gess;D. S. Rende