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首页> 外文期刊>RSC Advances >Fe3O4-PVAc nanocomposites: surface modification of sonochemically prepared magnetite nanoparticles via chemical grafting of poly(vinyl acetate)
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Fe3O4-PVAc nanocomposites: surface modification of sonochemically prepared magnetite nanoparticles via chemical grafting of poly(vinyl acetate)

机译：Fe3O4-PVAc纳米复合材料：通过化学接枝聚醋酸乙烯酯对声化学制备的磁铁矿纳米颗粒进行表面改性

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摘要

In the present study, magnetite nanoparticles (MNPs) were synthesized at room temperature under ultrasonic irradiation. The synthesized MNPs were then silylated with triethoxyvinylsilane to give a core-shell structure containing vinyl moieties on the surface. Encapsulation of the MNPs in a polysiloxane shell was clearly shown by transmission electron microscopy (TEM). The radical polymerization of the silylated product with vinyl acetate (VAc) leads to the formation of polymer nanocomposites (PN) in which some of the polymer chains are chemically grafted onto the MNPs. The homopolymer (PVAc) formed during polymerization was separated from the grafted MNPs using Soxhlet extraction. Chemical grafting of the polymer onto the MNPs was confirmed by Fourier transform infrared spectroscopy (FTIR). The amount of grafted polymer was calculated using thermogravimetric analysis (TGA). The thermal properties of the prepared MNPs, silylated MNPs, PVAc-grafted MNPs and PNs were studied using TGA. The MNPs and the nanocomposite containing 15 wt% of the PVAc-grafted MNPS (PN 15 wt%) were further investigated by scanning electron microscopy (SEM), TEM, XRD and energy dispersive X-ray analysis (EDAX). Vibrating sample magnetometry (VSM) showed the unique phenomenon of superparamagnetism for the prepared MNPs, silylated MNPs and PVAc-grafted MNPs.
机译：在本研究中，磁铁矿纳米粒子（MNPs）在室温下超声辐照下合成。然后将合成的MNP与三乙氧基乙烯基硅烷甲硅烷基化，得到在表面上含有乙烯基部分的核-壳结构。通过透射电子显微镜（TEM）清楚地显示了MNP在聚硅氧烷壳中的封装。甲硅烷基化产物与乙酸乙烯酯（VAc）的自由基聚合导致形成聚合物纳米复合材料（PN），其中一些聚合物链化学接枝到MNP上。使用索氏萃取将聚合过程中形成的均聚物（PVAc）与接枝的MNP分离。通过傅立叶变换红外光谱法（FTIR）证实了聚合物在MNP上的化学接枝。使用热重分析（TGA）计算接枝聚合物的量。使用TGA研究了制备的MNP，甲硅烷基化的MNP，PVAc接枝的MNP和PN的热性能。通过扫描电子显微镜（SEM），TEM，XRD和能量色散X射线分析（EDAX）进一步研究了含有15 wt％的PVAc接枝的MNPS（PN 15 wt％）的MNP和纳米复合材料。振动样品磁力分析（VSM）显示了制备的MNP，甲硅烷基化的MNP和PVAc接枝的MNP的超顺磁性现象。

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