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首页> 外文期刊>RSC Advances >Surfactant-free synthesis of sub-100 nm poly(styrene-co-divinylbenzene) nanoparticles by one-step ultrasonic assisted emulsification/polymerization
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Surfactant-free synthesis of sub-100 nm poly(styrene-co-divinylbenzene) nanoparticles by one-step ultrasonic assisted emulsification/polymerization

机译：一步超声辅助乳化/聚合反应无表面活性剂合成低于100 nm的聚苯乙烯-二乙烯基苯共聚物纳米粒子

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摘要

The synthesis of sub-100 nm polymeric nanoparticles in a surfactant-free form is currently very challenging due to the oil nanoemulsion instability in polar solvents and in the absence of stabilizers. Here we report for the first time the surfactant-free synthesis method of poly(styrene-co-divinylbenzene) nanoparticles in an aqueous environment using ultrasonic radiation. This method involves emulsification of the monomers mixture in water, followed by free-radical polymerization under pulsed or continuous acoustic fields. The local energy produced in water by cavitation effects was sufficient to: (1) generate and stabilize the monomer nanoemulsion due to mechanical forces, and (2) drive the radical polymerization due to the heat generated. The average size of the final polymer nanoparticles obtained depended: (i) inversely on the monomer/water interfacial energy, emulsification power, and (ii) directly on temperature, amount of initiator and monomer solubility. The polymer nanoparticle size distribution and shape was considerably improved upon the addition of a co-polymerizable surfactant.
机译：由于极性溶剂中油纳米乳液的不稳定性以及在没有稳定剂的情况下，无表面活性剂形式的亚100 nm聚合物纳米颗粒的合成目前非常具有挑战性。在这里，我们首次报道了使用超声辐射在水性环境中无表面活性剂的聚（苯乙烯-共二乙烯基苯）纳米粒子的合成方法。该方法包括将单体混合物在水中乳化，然后在脉冲或连续声场下进行自由基聚合。通过气蚀作用在水中产生的局部能量足以：（1）由于机械力而产生并稳定单体纳米乳液，（2）由于产生的热量而驱动自由基聚合。得到的最终聚合物纳米粒子的平均尺寸取决于：（i）相反地取决于单体/水的界面能，乳化能力，以及（ii）直接取决于温度，引发剂的量和单体的溶解度。添加可共聚合的表面活性剂后，聚合物纳米颗粒的尺寸分布和形状得到了显着改善。

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