本文研究了各种性质(Ni,Co,Fe,FeCo,SmCo5)与聚乙烯吡咯烷酮(PVP)共聚物形成甲基丙烯酸2-羟乙酯(HEMA)的结构和性能。使用FTIR光谱对复合材料进行了表征,SEM,DMTA,振动样品的磁力测定,比电阻率研究,以及机械和热物理研究。证实了接枝的空间交联共聚物(pHEMA-gr-PVP)的形成,并确定了仅引入10wt。%的共聚物配方使聚合物网络的交联度增加了三倍。复合材料的表面硬度提高了20-25%。然而,含水量下降了16-18%,在42-43重量%以内。%,这是一个相对较高的数字。通过维卡软化温度来表征干复合材料的耐热性。与未填充的材料相比,其高39-42°C。可以确定,所获得的复合材料的特征是矫顽力为200kA×m-1,并且在4-5mT和10-15mT的磁极处感应出磁场,分别。将FMF颗粒引入pHEMA-gr-PVP共聚物中,which,在干燥状态下,是电介质,为它们提供导电性,这是通过比容电阻来评估的。根据FMF的性质和内容,以及它们在磁场中的方向,填充材料的电阻可以在102-106欧姆·米内调节。因此,通过各种性质的铁磁填料用PVP共聚物对HEMA进行改性提供了获得具有独特预测性能的材料的可能性,并扩大了其应用领域,例如作为各种应用的磁性吸附剂,以及与它们的导电材料相关的可能性,这些材料可以通过改变电导率来响应,取决于各种因素。
The article investigates the peculiarities of the effect of ferromagnetic fillers (FMFs) of various natures (Ni, Co, Fe, FeCo, SmCo5) on the formation of the structure and properties of 2-hydroxyethylmethacrylate (HEMA) with polyvinylpyrrolidone (PVP) copolymers. The composites were characterized using FTIR-spectroscopy, SEM, DMTA, magnetometry of vibrating samples, specific electrical resistivity studies, and mechanical and thermophysical studies. The formation of a grafted spatially crosslinked copolymer (pHEMA-gr-PVP) was confirmed and it was established that the FMF introduction of only 10 wt.% into the copolymer formulation increased the degree of crosslinking of the polymer network by three times. The surface hardness of composites increased by 20-25%. However, the water content decreased by 16-18% and lay within 42-43 wt.%, which is a relatively high number. The heat resistance of dry composites was characterized by Vicat softening temperature, which was 39-42 °C higher compared to the unfilled material. It was established that the obtained composites were characterized by a coercive force of 200 kA × m-1 and induction of a magnetic field at the poles of 4-5 mT and 10-15 mT, respectively. The introduction of FMF particles into pHEMA-gr-PVP copolymers, which, in the dry state, are dielectrics, provides them with electrical conductivity, which was evaluated by the specific volume resistance. Depending on the FMF nature and content, as well as their orientation in the magnetic field, the resistance of filled materials could be regulated within 102-106 Ohm·m. Therefore, the modification of HEMA with PVP copolymers by ferromagnetic fillers of various natures provides the possibility of obtaining materials with unique predicted properties and expands the fields of their use, for instance as magnetic sorbents for various applications, as well as the possibilities associated with their being electrically conductive materials that can respond by changing of electrical conductivity, depending on various factors.