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Janus Particles Synthesis by Emulsion Interfacial Polymerization: Polystyrene as Seed or Beyond?
Macromolecules ( IF 5.1 ) Pub Date : 2018-01-18 00:00:00 , DOI: 10.1021/acs.macromol.7b02304 Jun-Bing Fan 1 , Hong Liu 2 , Yongyang Song 1, 3 , Zhen Luo 1, 3 , Zhongyuan Lu 2 , Shutao Wang 1, 3
Macromolecules ( IF 5.1 ) Pub Date : 2018-01-18 00:00:00 , DOI: 10.1021/acs.macromol.7b02304 Jun-Bing Fan 1 , Hong Liu 2 , Yongyang Song 1, 3 , Zhen Luo 1, 3 , Zhongyuan Lu 2 , Shutao Wang 1, 3
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New strategies for synthesis of Janus particles are of essential importance in the advancement of material science and technology. However, it remains a great challenge to synthesize uniform Janus particles with controllable topological and chemical anisotropy. To overcome this challenge, we have recently developed a general emulsion interfacial polymerization approach. This approach can be applicable to a wide variety of vinyl monomers, including positively charged, neutrally charged, and negatively charged monomers. Different from the traditional seed swelling emulsion polymerization that usually involved using cross-linked polystyrene (PS) particles as seeds to produce Janus particles, we preloaded non-cross-linked PS particles in the emulsion system to construct an interfacial polymerization system. However, the role of these non-cross-linked PS particles in the emulsion interfacial polymerization is unclear. In this work, we revealed the role of non-cross-linked PS particles preloaded in emulsion interfacial polymerization for fabricating uniform Janus particles with controllable topology. We found that the introduction of non-cross-linked PS particles could significantly control the topology and uniformity of Janus particles. Theoretical simulation results by dissipative particle dynamics simulation coupled with stochastic reaction model revealed that the polymer chains of PS inside oil droplets play a decisive role in the topographic control of Janus particles. These hydrophobic PS chains could slow down the polymerization inside oil droplets due to shielding effect of the PS chains to the newly formed poly(styrene–divinylbenzene) (PSDVB) nucleus. Meanwhile, we demonstrated that the diverse topology features of Janus particles could be tuned by regulating the concentration of PS polymer and monomers. These results may help us to comprehensively understand the mechanism of emulsion interfacial polymerization methodology and design new functional particle materials.
中文翻译：
乳液界面聚合合成Janus粒子：聚苯乙烯是种子还是超越种子？
合成Janus颗粒的新策略对材料科学和技术的发展至关重要。但是，合成具有可控拓扑和化学各向异性的均匀Janus颗粒仍然是一个巨大的挑战。为了克服这一挑战，我们最近开发了一种通用的乳液界面聚合方法。该方法可适用于多种乙烯基单体，包括带正电，带中性和带负电的单体。与通常涉及使用交联聚苯乙烯（PS）颗粒作为种子生产Janus颗粒的传统种子溶胀乳液聚合不同，我们将非交联PS颗粒预装在乳液体系中以构建界面聚合体系。然而，这些非交联的PS颗粒在乳液界面聚合中的作用尚不清楚。在这项工作中，我们揭示了乳液界面聚合中预装的非交联PS颗粒对于制造拓扑结构可控的均匀Janus颗粒的作用。我们发现引入非交联的PS粒子可以显着控制Janus粒子的拓扑和均匀性。通过耗散粒子动力学模拟和随机反应模型的理论模拟结果表明，油滴内PS的聚合物链在Janus粒子的形貌控制中起着决定性的作用。这些疏水性PS链可能会由于PS链对新形成的聚（苯乙烯-二乙烯基苯）（PSDVB）核的屏蔽作用而减慢油滴内部的聚合。同时，我们证明可以通过调节PS聚合物和单体的浓度来调节Janus颗粒的多种拓扑特征。这些结果可能有助于我们全面了解乳液界面聚合方法的机理，并设计新的功能性颗粒材料。
更新日期：2018-01-18
中文翻译：
乳液界面聚合合成Janus粒子：聚苯乙烯是种子还是超越种子？
合成Janus颗粒的新策略对材料科学和技术的发展至关重要。但是，合成具有可控拓扑和化学各向异性的均匀Janus颗粒仍然是一个巨大的挑战。为了克服这一挑战，我们最近开发了一种通用的乳液界面聚合方法。该方法可适用于多种乙烯基单体，包括带正电，带中性和带负电的单体。与通常涉及使用交联聚苯乙烯（PS）颗粒作为种子生产Janus颗粒的传统种子溶胀乳液聚合不同，我们将非交联PS颗粒预装在乳液体系中以构建界面聚合体系。然而，这些非交联的PS颗粒在乳液界面聚合中的作用尚不清楚。在这项工作中，我们揭示了乳液界面聚合中预装的非交联PS颗粒对于制造拓扑结构可控的均匀Janus颗粒的作用。我们发现引入非交联的PS粒子可以显着控制Janus粒子的拓扑和均匀性。通过耗散粒子动力学模拟和随机反应模型的理论模拟结果表明，油滴内PS的聚合物链在Janus粒子的形貌控制中起着决定性的作用。这些疏水性PS链可能会由于PS链对新形成的聚（苯乙烯-二乙烯基苯）（PSDVB）核的屏蔽作用而减慢油滴内部的聚合。同时，我们证明可以通过调节PS聚合物和单体的浓度来调节Janus颗粒的多种拓扑特征。这些结果可能有助于我们全面了解乳液界面聚合方法的机理，并设计新的功能性颗粒材料。
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