Davino Daniele, D'Auria Marco, Pantani Roberto, Sorrentino Luigi
Dipartimento di Ingegneria, Università degli Studi del Sannio, Piazza Roma 21-24, 82100 Benevento, Italy.
Istituto per i Polimeri, Compositi e Biomateriali, Consiglio Nazionale delle Ricerche, Piazzale Enrico Fermi 1, 80055 Portici (NA), Italy.
Polymers (Basel). 2020 Dec 23;13(1):24. doi: 10.3390/polym13010024.
Polymeric smart foams are lightweight and multifunctional porous materials that are sensitive to the magnetic field due to the presence of magnetic particles embedded in the matrix. Recently, a constant magnetic field has been exploited to align the particles along the magnetic field lines during the formation of the porous structure. In this paper, a new field-structuring process was developed that makes use of a time-profiled magnetic field during the foaming process to control the geometrical features of the particles aggregates. The effects of magnetic field strength as well as the switch-on and switch-off times on the magnetoelastic behavior of the smart foams were investigated. It was proven that the alignment of the particles results in both a strong relative sensitivity to the magnetic field and a positive stress change, whose extent depends on the geometrical features of the developed aggregates.
聚合物智能泡沫是轻质且多功能的多孔材料，由于基体中嵌入了磁性颗粒，它们对磁场敏感。最近，人们利用恒定磁场在多孔结构形成过程中使颗粒沿磁力线排列。本文开发了一种新的场结构化工艺，该工艺在发泡过程中利用随时间变化的磁场来控制颗粒聚集体的几何特征。研究了磁场强度以及开启和关闭时间对智能泡沫磁弹性行为的影响。结果表明，颗粒的排列导致对磁场的强烈相对敏感性和正应力变化，其程度取决于所形成聚集体的几何特征。
