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Mechanistic Investigation of Surfactant-Free Emulsion Polymerization Using Magnetite Nanoparticles Modified by Citric Acid as Stabilizers.
Langmuir ( IF 3.9 ) Pub Date : 2020-07-08 , DOI: 10.1021/acs.langmuir.0c01493
Keran Li 1 , Linfeng Xie 1 , Bin Wang 1 , Jiahe Yan 1 , Haoru Tang 1 , Dahua Zhou 2
Affiliation  

Fe3O4-armored latexes were successfully synthesized by using modified Fe3O4 (IO) nanoparticles as stabilizers without a surfactant. The particle size, conversion, and particle number density of latex particles during the formation process were studied in detail. The surface charge density and the particle size evolutions of latexes were studied by dynamic light scattering. The use of scanning electron microscopy confirmed that IO nanoparticles were adsorbed on the polymer particle surface. Furthermore, the efficiency of iron oxide incorporation (IE) was evaluated by thermogravimetric analysis. The effect of pH, solid content, and zeta potential of IO nanoparticles on the results of polymerization was also discussed in detail. Attempts were made to explain the change of latex particle surface charge density by using Guy-Chapman-Stern’s electric double layer theory. In addition, the effect of ionic strength of ammonium sulfate on particle number density of latex particles was described using P. John Feeney’s equation. Finally, the mechanistic insights were discussed by studying polymerization kinetics.

中文翻译:

使用柠檬酸修饰的磁铁矿纳米粒子作为稳定剂的无表面活性剂乳液聚合的机理研究。

用改性的Fe 3 O 4成功合成了Fe 3 O 4铠装胶乳(IO)纳米粒子作为稳定剂,不含表面活性剂。详细研究了乳胶颗粒在形成过程中的粒径,转化率和颗粒数密度。通过动态光散射研究了乳胶的表面电荷密度和粒径演变。扫描电子显微镜的使用证实了IO纳米颗粒被吸附在聚合物颗粒表面上。此外,通过热重分析评估了氧化铁掺入(IE)的效率。还详细讨论了IO纳米粒子的pH,固含量和Zeta电位对聚合结果的影响。利用盖伊·查普曼·斯特恩的双电层理论试图解释乳胶颗粒表面电荷密度的变化。此外,使用P. John Feeney方程描述了硫酸铵的离子强度对乳胶颗粒数密度的影响。最后,通过研究聚合动力学讨论了机理的见解。
更新日期:2020-07-21
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