Temasek Laboratories, Nanyang Technological University , 50 Nanyang Drive, Singapore 637553, Singapore.
ACS Appl Mater Interfaces. 2014;6(21):18644-52. doi: 10.1021/am503774a. Epub 2014 Oct 15.
Syntactic foams, which can be synthesized by mechanical mixing of hollow microspheres with a matrix material, are a special class of lightweight composite materials. Developing of high-performance syntactic foams remains challenges. In this work, a facile and environmentally friendly surface modification method employing polydopamine (PDA) as a surface treatment agent for hollow carbon microspheres (HCMs) was used, aiming to extend the application of syntactic foams to seldom touched areas. The PDA coating was used as a strategy for interfacial interaction enhancement and also as a platform for further metal coating meant for electromagnetic interference (EMI) shielding. The stronger interfacial interaction between microspheres and polymer matrix provided effective interfacial stress transfer, as a result of the syntactic foams with high strength to weight ratio. Furthermore, the PDA coating on HCMs served as a versatile platform for the growth of noble metals on the surface of PDA-HCMs. Silver nanoparticles was grown by PDA medium. The silver coated HCMs (Ag-PDA-HCMs) impacted the complex permittivity of the syntactic foams leading to high EMI shielding effectiveness (SE). The specific EMI SE reached up to 46.3 dB·cm(3)/g, demonstrated the Ag-PDA-HCMs/epoxy syntactic foam as a promising candidate for lightweight high-performance EMI shielding material.
可通过将空心微球与基体材料机械混合合成的句法泡沫是一种特殊的轻质复合材料。开发高性能的句法泡沫仍然具有挑战性。在这项工作中，采用聚多巴胺 (PDA) 作为表面处理剂，对空心碳微球 (HCM) 进行了简便且环保的表面改性方法，旨在将句法泡沫的应用扩展到很少涉及的领域。PDA 涂层既可以作为增强界面相互作用的策略，也可以作为进一步涂覆用于电磁干扰 (EMI) 屏蔽的金属的平台。由于具有高强度与重量比的句法泡沫，微球与聚合物基体之间更强的界面相互作用提供了有效的界面应力传递。此外，HCM 上的 PDA 涂层作为在 PDA-HCM 表面生长贵金属的通用平台。通过 PDA 介质生长了银纳米颗粒。涂覆银的 HCM（Ag-PDA-HCM）影响了句法泡沫的复介电常数，从而实现了高 EMI 屏蔽效能 (SE)。特定 EMI SE 高达 46.3 dB·cm(3)/g，表明 Ag-PDA-HCM/环氧树脂句法泡沫是一种很有前途的轻质高性能 EMI 屏蔽材料的候选材料。
