Role of Adsorbed Polymers on Nanoparticle Dispersion in Drying Polymer Nanocomposite Films.
Role of Adsorbed Polymers on Nanoparticle Dispersion in Drying Polymer Nanocomposite Films.
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DOI：
10.3390/polym13172960
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发表时间：
2021-08-31
期刊：
影响因子：
5
通讯作者：
Park JD
中科院分区：
文献类型：
--
作者：
Kim S;Oh SM;Kim SY;Park JD
吸附在纳米颗粒上的聚合物是决定纳米颗粒在聚合物纳米复合材料(PNC)膜中分散的重要因素。虽然先前的研究表明，增加聚合物在纳米颗粒上的吸附数量可以改善其在干燥过程中的分散性，但确切的机制尚不清楚。在这项研究中，我们研究了吸附聚合物在干燥过程中对纳米颗粒的微观结构和分散性的影响。利用同步辐射垂直小角X射线散射技术对纳米颗粒结构发展的研究表明，在干燥后期，当纳米颗粒相互靠近并接触时，聚合物吸附的增加会抑制纳米颗粒之间的结合。在颗粒长度尺度上，吸附了大量聚合物的纳米颗粒形成了疏松的团簇，而吸附了少量聚合物的纳米颗粒形成了致密的团簇。在团簇长度尺度上，具有大量吸附聚合物的疏松纳米粒子簇形成密集堆积的聚集体，而具有少量吸附聚合物的致密纳米粒子簇形成疏松聚集体。本研究建立了通过聚合物吸附修饰来定量控制NP在PNC膜中分散的可能性。
Polymers adsorbed on nanoparticles (NPs) are important elements that determine the dispersion of NPs in polymer nanocomposite (PNC) films. While previous studies have shown that increasing the number of adsorbed polymers on NPs can improve their dispersion during the drying process, the exact mechanism remained unclear. In this study, we investigated the role of adsorbed polymers in determining the microstructure and dispersion of NPs during the drying process. Investigation of the structural development of NPs using the synchrotron vertical-small-angle X-ray scattering technique revealed that increasing polymer adsorption suppresses bonding between the NPs at later stages of drying, when they approach each other and come in contact. On the particle length scale, NPs with large amounts of adsorbed polymers form loose clusters, whereas those with smaller amounts of adsorbed polymers form dense clusters. On the cluster length scale, loose clusters of NPs with large amounts of adsorbed polymers build densely packed aggregates, while dense clusters of NPs with small amounts of adsorbed polymers become organized into loose aggregates. The potential for the quantitative control of NP dispersion in PNC films via modification of polymer adsorption was established in this study.
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