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Tunable synthetic control of soft polymeric nanoparticle morphology
Soft Matter ( IF 3.4 ) Pub Date : 2017-10-31 00:00:00 , DOI: 10.1039/c7sm01533j
Halie J. Martin 1, 2, 3 , B. Tyler White 3, 4, 5 , Christopher J. Scanlon 3, 4, 5 , Tomonori Saito 3, 4, 5 , Mark D. Dadmun 1, 2, 3, 4, 5
Affiliation  

With a growing variety of nanoparticles available, research probing the influence of particle deformability, morphology, and topology on the behavior of all polymer nanocomposites is also increasing. In particular, the behavior of soft polymeric nanoparticles in polymer nanocomposites has displayed unique behavior, but their precise performance depends intimately on the internal structure and morphology of the nanoparticle. With the goal of providing guidelines to control the structure and morphology of soft polymeric nanoparticles, we have examined monomer starved semi-batch nano-emulsion polymerizations that form organic, soft nanoparticles, to correlate the precise structure of the nanoparticle to the rate of monomer addition and crosslinking density. The synthesis method produces 5–20 nm radii polystyrene nanoparticles with tunable morphologies. We report small angle neutron scattering (SANS) results that correlate synthetic conditions to the structural characteristics of soft polystyrene nanoparticles. These results show that the measured molecular weight of the nanoparticles is controlled by the monomer addition rate, the total nanoparticle radius is controlled by the excess surfactant concentration, and the crosslinking density has a direct effect on the topology of each nanoparticle. These studies thus provide pathways to control these 3 structural characteristics of the nanoparticle. This research, therefore provides a conduit to thoroughly investigate the effect of structural features of soft nanoparticles on their individual properties and those of their polymer nanocomposites.

中文翻译:

可调谐合成控制的软聚合物纳米粒子的形态

随着可用的纳米颗粒种类的增加,探索颗粒可变形性,形态和拓扑结构对所有聚合物纳米复合材料行为的影响的研究也在不断增加。特别地,软聚合物纳米颗粒在聚合物纳米复合材料中的行为表现出独特的行为,但是它们的精确性能与纳米颗粒的内部结构和形态密切相关。为了提供控制软聚合物纳米颗粒的结构和形态的指导方针,我们检查了形成有机软纳米颗粒的单体饥饿的半间歇式纳米乳液聚合,以将纳米颗粒的精确结构与单体添加速率相关联和交联密度。合成方法产生具有可调形态的5–20 nm半径的聚苯乙烯纳米颗粒。我们报告了小角度中子散射(SANS)结果,该结果将合成条件与软聚苯乙烯纳米颗粒的结构特征相关联。这些结果表明,纳米颗粒的测量分子量由单体添加速率控制,纳米颗粒的总半径由过量的表面活性剂浓度控制,并且交联密度对每个纳米颗粒的拓扑结构具有直接影响。因此,这些研究提供了控制纳米颗粒的这3种结构特征的途径。因此,这项研究提供了一个途径,可以彻底研究软纳米颗粒的结构特征对它们各自的性能以及它们的聚合物纳米复合材料的影响。我们报告了小角度中子散射(SANS)结果,该结果将合成条件与软聚苯乙烯纳米颗粒的结构特征相关联。这些结果表明,纳米颗粒的测量分子量由单体添加速率控制,纳米颗粒的总半径由过量的表面活性剂浓度控制,并且交联密度对每个纳米颗粒的拓扑结构具有直接影响。因此,这些研究提供了控制纳米颗粒的这3种结构特征的途径。因此,这项研究提供了一个途径,可以彻底研究软纳米颗粒的结构特征对它们各自的性能以及它们的聚合物纳米复合材料的影响。我们报告了小角度中子散射(SANS)结果,该结果将合成条件与软聚苯乙烯纳米颗粒的结构特征相关联。这些结果表明,纳米颗粒的测量分子量受单体添加速率控制,纳米颗粒的总半径受表面活性剂的过量浓度控制,并且交联密度直接影响每个纳米颗粒的拓扑结构。因此,这些研究提供了控制纳米颗粒的这3种结构特征的途径。因此,这项研究提供了一个途径,可以彻底研究软纳米颗粒的结构特征对它们各自的性能以及它们的聚合物纳米复合材料的影响。
更新日期:2017-11-16
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