Department of Materials Science and Engineering, Clemson University , 161 Sirrine Hall, Clemson, South Carolina 29626, United States.
ACS Appl Mater Interfaces. 2017 Jul 12;9(27):22927-22940. doi: 10.1021/acsami.7b04546. Epub 2017 Jun 26.
This research is focused on the fabrication and properties of epoxy nanocomposites containing magnetized SiC whiskers (MSiCWs). To this end, we report an original strategy for fabrication of magnetically active SiCWs by decorating the whiskers with magnetic (iron oxide) nanoparticles via polymer-polymer (poly(acrylic acid)/poly(2-vinyl pyridine)) complexation. The obtained whiskers demonstrated a substantial magnetic response in the polymerizing epoxy resin, with application of only a 20 mT (200 G) magnetic field. We also found that the whiskers chemically reacted with the epoxy resin, causing formation of an extended interphase near the boundary of the whiskers. The SiC whiskers oriented with the magnetic field demonstrated positive effects on the behavior of epoxy-based nanocomposites. Namely, the aligned MSiCWs enhanced the thermomechanical properties of the materials significantly above that of the neat epoxy and epoxy nanocomposite, with randomly oriented whiskers.
本研究专注于制备含有磁化碳化硅晶须（MSiCWs）的环氧树脂纳米复合材料及其性能。为此，我们报告了一种通过聚合物-聚合物（聚丙烯酸/聚（2-乙烯基吡啶））络合在晶须上修饰磁性（氧化铁）纳米粒子来制备磁性 SiCWs 的原创策略。所获得的晶须在聚合环氧树脂中表现出很强的磁响应，只需施加 20 mT（200 G）的磁场。我们还发现，晶须与环氧树脂发生化学反应，导致在晶须边界附近形成扩展的界面相。与磁场取向的 SiC 晶须对基于环氧树脂的纳米复合材料的性能表现出积极的影响。即，取向的 MSiCWs 显著提高了材料的热机械性能，明显高于未增强的环氧树脂和具有随机取向晶须的环氧树脂纳米复合材料。
