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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of poly(methyl methacrylate)-clayv nanocomposites via melt intercalation: The effect of organoclay on the structure and thermal properties
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Preparation and characterization of poly(methyl methacrylate)-clayv nanocomposites via melt intercalation: The effect of organoclay on the structure and thermal properties

机译：熔融插层法制备和表征聚（甲基丙烯酸甲酯）-粘土纳米复合材料：有机粘土对结构和热性能的影响

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摘要

Nanocomposites of poly(methyl methacrylate) (PMMA) with layered silicates were prepared by the melt mixing route. The PMMA-montmorillonite hybrids were characterized by wide-angle X-ray diffraction, thermo-gravimetric analysis (TGA), and differential scanning calorimetry (DSC). Except for the hybrid formed with unmodified sodium montmorillonite, where a change in distribution of clay platelet stacks was observed without polymer intercalation, the use of organically modified montmorillonites produced well-intercalated systems. An increase in the separation of the clay layers due to polymer intercalation was observed in the range 7-14 Angstrom. TGA thermographs indicated that the onset of decomposition increased by 15-30degreesC, depending on the organoclay, as compared to PMMA itself. DSC results showed the existence of a glass-transition temperature (T-g) for all the hybrids and also showed that the T-g of the hybrids were lower (by similar to10%) compared to that of PMMA. Among the various modifiers, the ones that were relatively more polar favored a greater extent of intercalation of PMMA into the clay layers. The thermal stabilities of the nanocomposites were superior to that of PMMA and were controlled by the stability of the organoclay and its interaction with PMMA. (C) 2003 Wiley Periodicals, Inc. [References: 17]
机译：通过熔融混合法制备了聚甲基丙烯酸甲酯（PMMA）与层状硅酸盐的纳米复合材料。 PMMA-蒙脱土杂化物的特征在于广角X射线衍射，热重分析（TGA）和差示扫描量热法（DSC）。除了与未改性的蒙脱土钠形成的杂化物外，在没有聚合物插层的情况下观察到粘土血小板堆积的分布发生了变化，使用有机改性的蒙脱土产生了良好的插层体系。在7-14埃的范围内，观察到由于聚合物插层而使粘土层的分离增加。 TGA热像仪表明，与PMMA本身相比，取决于有机粘土，分解开始增加了15-30℃。 DSC结果表明，所有杂种均存在玻璃化转变温度（T-g），并且与PMMA相比，杂种的T-g更低（约10％）。在各种改性剂中，极性相对较大的改性剂更倾向于将PMMA插入到粘土层中。纳米复合材料的热稳定性优于PMMA，并且受有机粘土的稳定性及其与PMMA相互作用的控制。 （C）2003 Wiley Periodicals，Inc. [参考：17]

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