首页> 外文期刊>Progress in Organic Coatings: An International Review Journal >Curing behavior of epoxy/Fe3O4 nanocomposites: A comparison between the effects of bare Fe3O4, Fe3O4/SiO2/chitosan and Fe3O4/SiO2/chitosan/imide/phenylalanine-modified nanofillers
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Curing behavior of epoxy/Fe3O4 nanocomposites: A comparison between the effects of bare Fe3O4, Fe3O4/SiO2/chitosan and Fe3O4/SiO2/chitosan/imide/phenylalanine-modified nanofillers

机译:环氧树脂/ Fe3O4纳米复合材料的固化行为:裸FE3O4,Fe3O4 / SiO2 /壳聚糖和Fe3O4 / SiO2 /壳聚糖/酰亚胺/苯丙氨酸改性纳米填料的效果比较

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摘要

In this study, Fe3O4 magnetic nanoparticles (MNPs) were synthesized (B-MNP) and then modified with SiO2 to form Fe3O4/SiO2 core/shell MNPs. The Fe3O4/SiO2 MNPs were chemically functionalized with chitosan so as to gain Fe3O4/SiO2/Chitosan (CH-MNP). The CH-MNP was functionalized with a macromolecule containing imide and phenylalanine precursors to gain Fe3O4/SiO2/Chitosan/imide/phenylalanine based MNPs (CH-IM-MNP). The differences in chemical structures of the synthesized MNPs were quantified by FTIR and TGA analyses, where grafting ratios of ca. 6 and 28% were calculated for CH-MNP and CH-IM-MNP nanoparticles, respectively. Nanocomposites were prepared by addition of very low (0.1 wt.% nanoparticle based on 100 parts by weight of epoxy) to epoxy/amine systems. Curing behavior of the blank and MNPs-incorporated nanocomposites were studied by nonisothermal DSC analyses varying heating rate, which allowed for giving useful insights into the effect of chemical surface functionalization of MNPs on the curing potential/behavior of epoxy/amine systems. Analysis of fracture surface of the blank and MNPs-incorporated systems using SEM micrographs revealed a very high potential of cure when CH-IM-MNP added to epoxy/amine formulation.
机译:在本研究中,我们合成了Fe3O4磁性纳米颗粒(B-MNP),然后用SiO2修饰形成Fe3O4/SiO2核/壳MNP。用壳聚糖对Fe3O4/SiO2-MNP进行化学官能化,得到Fe3O4/SiO2/chitosan(CH-MNP)。用含有酰亚胺和苯丙氨酸前体的大分子对CH-MNP进行功能化,得到Fe3O4/SiO2/壳聚糖/酰亚胺/苯丙氨酸基MNP(CH-IM-MNP)。通过FTIR和TGA分析量化合成的MNP的化学结构差异,其中CH-MNP和CH-IM-MNP纳米颗粒的接枝率分别为6%和28%。纳米复合材料是通过向环氧树脂/胺体系中添加非常低的(0.1 wt.%纳米颗粒,基于100重量份的环氧树脂)来制备的。采用非等温DSC分析了不同的加热速率,研究了空白和MnPS结合的纳米复合材料的固化行为,这允许对MNPS的化学表面官能化对环氧树脂/胺体系的固化潜力/行为的影响给出有用的见解。使用SEM显微照片分析坯料和MnPS掺入系统的断裂表面揭示了当CH-IM-MNP添加到环氧树脂/胺配方中时非常高的固化潜力。

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