硬脂酸镍与2,2′-硫代双(-4-叔辛基酚)在聚丙烯抗光氧老化中的协同作用及其机理的研究

本文用IR、NMR、UV以及力学性能测定等方法研究了硬脂酸镍和2,2′-硫代双4-叔辛基酚)并用体系在聚丙烯抗光氧老化中的光防护效果。结果表明,本体系有协同作用,其协同作用的机理可能是本体系在热加工条件下,形成了类似于Am101的镍-硫代双酚的螯合物。     

Tri-band transparent cross-polarization converters using a chiral metasurface

A chiral metasurface is proposed to realize a tri-band polarization angle insensitive cross-polarization converter. The unit cell of the chiral metamaterial is composed by four twisted anisotropic structure pairs in four-fold rotation symmetry.The simulation results show that this device can work at 9.824 GHz, 11.39 GHz, and 13.37 GHz with low loss and a high polarization conversion ratio(PCR) of more than 99%. The proposed design can transmit the co-polarization wave at14.215 GHz, like a frequency selective surface. The study of the current and electric fields distributions indicates that the cross-polarization transmission is due to electric dipole coupling.