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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Chitosan-starch film reinforced with magnetite-decorated carbon nanotubes
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Chitosan-starch film reinforced with magnetite-decorated carbon nanotubes

机译：磁铁矿修饰碳纳米管增强的壳聚糖-淀粉膜

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摘要

Carbon nanotubes and magnetite nanoparticles are materials with unique and extraordinary properties having a wider range of applications in diverse areas of science and engineering. In addition, this kind of nanomaterial can be linked to a polymeric matrix resulting in a multifunctional composite material with enhanced properties. We present here the synthesis of chitosan-starch (CH-S) films reinforced with magnetite-decorated carbon nanotubes and their properties were studied. In order to synthesize the nanocomposite material, multi-walled carbon nanotubes (MWCNTs) were first decorated with magnetite nanoparticles (MNPs) of 13.4 ± 3.7 nm using MWCNT/MNPs ratios of 0.2 and 2. Chitosan chains were used as bonding agent, and in the next step, MWCNT/MNPs was incorporated into a polymeric matrix of 70% of chitosan and 30% of starch. Concentrations of magnetite decorated MWCNT in the films were 0.1%, 0.25%, and 0.5%, respectively. Thermogravimetric and dynamic mechanical analyses were performed. The lowest concentration polymeric film showed homogeneous particle distribution, and this homogeneity was lost due to the formation of large agglomerates (≈192nm) at higher concentration. This behavior affected the physical properties of nanocomposites. Storage modulus of the film decreased as the concentration of decorated MWCNT increased indicating dependence of storage modulus on agglomerates size. The storage modulus increased in the temperature range of 150-250℃ This behavior was more pronounced at 1:3 ratios of MWCNT/MNPs due to the stronger interfacial adhesion between nanoparticles and the polymeric matrix. The magnetic behavior and electrical conductivity of the nanocomposites were also studied.
机译：碳纳米管和磁铁矿纳米颗粒是具有独特和非凡性能的材料，在科学和工程的各个领域都有广泛的应用。另外，这种纳米材料可以与聚合物基质连接，从而得到具有增强性能的多功能复合材料。我们在这里介绍了用磁铁矿修饰的碳纳米管增强的壳聚糖-淀粉（CH-S）膜的合成及其性能。为了合成纳米复合材料，首先用13.4±3.7 nm的磁铁矿纳米颗粒（MNP）装饰多壁碳纳米管（MWCNT），使用MWCNT / MNPs的比率为0.2和2。壳聚糖链用作粘合剂，并且在下一步，将MWCNT / MNP掺入70％壳聚糖和30％淀粉的聚合物基质中。膜中磁铁矿装饰的MWCNT的浓度分别为0.1％，0.25％和0.5％。进行了热重分析和动态力学分析。最低浓度的聚合物膜显示出均匀的颗粒分布，并且由于在较高浓度下形成大的团聚体（≈192nm）而失去了这种均质性。这种行为影响了纳米复合材料的物理性能。膜的储能模量随装饰的MWCNT浓度的增加而降低，表明储能模量与团聚体尺寸有关。在150-250℃的温度范围内，储能模量增加。由于纳米碳管和聚合物基体之间的界面更牢固，因此在MWCNT / MNPs为1：3的情况下，这种行为更为明显。还研究了纳米复合材料的磁行为和电导率。

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