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首页> 外文期刊>ACS Omega >Polypropylene/Layered Double Hydroxide Nanocomposites: Influence of LDH Intralayer Metal Constituents on the Properties of Polypropylene
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Polypropylene/Layered Double Hydroxide Nanocomposites: Influence of LDH Intralayer Metal Constituents on the Properties of Polypropylene

机译：聚丙烯/双层氢氧化物纳米复合材料：LDH层内金属成分对聚丙烯性能的影响

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Sonication-assisted delamination of layered double hydroxides (LDHs) resulted in smaller-sized LDH nanoparticles (～50–200 nm). Such delaminated Co–Al LDH, Zn–Al LDH, and Co–Zn–Al LDH solutions were used for the preparation of highly dispersed isotactic polypropylene (iPP) nanocomposites. Transmission electron microscopy and wide-angle X-ray diffraction results revealed that the LDH nanoparticles were well dispersed within the iPP matrix. The intention of this study is to understand the influence of the intralayer metal composition of LDH on the various properties of iPP/LDH nanocomposites. The sonicated LDH nanoparticles showed a significant increase in the crystallization rate of iPP; however, not much difference in the crystallization rate of iPP was observed in the presence of different types of LDH. The dynamic mechanical analysis results indicated that the storage modulus of iPP was increased significantly with the addition of LDH. The incorporation of different types of LDH showed no influence on the storage modulus of iPP. But considerable differences were observed in the flame retardancy and thermal stability of iPP with the type of LDH used for the preparation of nanocomposites. The thermal stability (50% weight loss temperature (T _(0.5))) of the iPP nanocomposite containing three-metal LDH (Co–Zn–Al LDH) is superior to that of the nanocomposites made of two-metal LDH (Co–Al LDH and Zn–Al LDH). Preliminary studies on the flame-retardant properties of iPP/LDH nanocomposites using microscale combustion calorimetry showed that the peak heat release rate was reduced by 39% in the iPP/Co–Zn–Al LDH nanocomposite containing 6 wt % LDH, which is higher than that of the two-metal LDH containing nanocomposites, iPP/Co–Al LDH (24%) and iPP/Zn–Al LDH (31%). These results demonstrated that the nanocomposites prepared using three-metal LDH showed better thermal and flame-retardant properties compared to the nanocomposites prepared using two-metal LDH. This difference might be due to the better char formation capability of three-metal LDH compared to that of two-metal LDH.
机译：超声辅助层状双氢氧化物（LDHs）的分层产生了较小尺寸的LDH纳米粒子（〜50–200 nm）。这种分层的Co-Al LDH，Zn-Al LDH和Co-Zn-Al LDH溶液用于制备高度分散的等规聚丙烯（iPP）纳米复合材料。透射电子显微镜和广角X射线衍射结果表明，LDH纳米颗粒很好地分散在iPP基质内。本研究的目的是了解LDH的层内金属成分对iPP / LDH纳米复合材料各种性能的影响。超声处理的LDH纳米颗粒显示iPP的结晶速率显着增加;但是，在存在不同类型的LDH的情况下，iPP的结晶速率差异不大。动态力学分析结果表明，加入LDH可显着提高iPP的储能模量。掺入不同类型的LDH对iPP的储能模量没有影响。但是，与用于制备纳米复合材料的LDH类型相比，iPP的阻燃性和热稳定性存在显着差异。包含三金属LDH（Co–Zn–Al LDH）的iPP纳米复合材料的热稳定性（50％失重温度（ T _（0.5）））优于由两种金属LDH制成的纳米复合材料（钴铝LDH和锌铝LDH）。使用微型燃烧量热法对iPP / LDH纳米复合材料的阻燃性能进行的初步研究表明，含有6 wt％LDH的iPP / Co-Zn-Al LDH纳米复合材料的峰值放热率降低了39％。含两种金属的LDH纳米复合材料的iPP / Co-Al LDH（24％）和iPP / Zn-Al LDH（31％）。这些结果表明，与使用二金属LDH制备的纳米复合材料相比，使用三金属LDH制备的纳米复合材料表现出更好的热和阻燃性能。这种差异可能是由于三金属LDH的焦炭形成能力比两金属LDH更好。

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