Influence of organic modification on mechanical properties of melt processed intercalated poly(methyl methacrylate)–organoclay nanocomposites
Influence of organic modification on mechanical properties of melt processed intercalated poly(methyl methacrylate)–organoclay nanocomposites
复制标题
有机改性对熔融加工插层聚甲基丙烯酸甲酯-有机粘土纳米复合材料机械性能的影响
DOI：
10.1002/app.26192
复制
发表时间：
2007
影响因子：
3
通讯作者：
U. Natarajan
中科院分区：
文献类型：
--
作者：
R. R. Tiwari;U. Natarajan
研究了有机改性剂对聚甲基丙烯酸甲酯（PMMA）-粘土纳米复合材料插层程度、结构、热性能和力学性能的影响。两种不同的有机改性剂与不同的疏水性（单牛脂与二牛脂）进行了研究。采用熔融法制备了纳米复合材料，并通过广角X射线衍射、透射电子显微镜、热重分析、差示扫描量热法（DSC）和拉伸试验进行了表征。测定了纳米复合材料在各种粘土负载下的机械性能，例如拉伸模量（E）、断裂应力（σbrk）和%断裂应变（ebrk）。PMMA插层的程度是足够的，并且取决于有机粘土和填料加载量在9-15 A的范围内。纳米复合材料的整体热稳定性提高了16-30°C。纳米复合材料的Tg仅提高2-4°C。随着粘土加载量的增加，拉伸模量线性增加，而%断裂应变降低。发现断裂应力增加至4wt%，并在更高的粘土负载量下进一步降低。对于含有具有较低疏水性和单一牛脂胺化学结构的有机改性剂的有机粘土，热性能和机械性能的总体改善更高。© 2007威利期刊公司应用聚合物科学杂志2007
The influence of organic modifiers on intercalation extent, structure, thermal and mechanical properties of poly(methyl methacrylate) (PMMA)–clay nanocomposites were studied. Two different organic modifiers with varying hydrophobicity (single tallow versus ditallow) were investigated. The nanocomposites were prepared from melt processing method and characterized using wide angle X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, differential scanning calorimetry (DSC), and tensile tests. Mechanical properties such as tensile modulus (E), break stress (σbrk), and % break strain (ebrk) were determined for nanocomposites at various clay loadings. Extent of PMMA intercalation is sufficient and in the range 9–15 A depending on organoclay and filler loading. Overall thermal stability of nanocomposites increases by 16–30°C. The enhancement in Tg of nanocomposite is merely by 2–4°C. With increase in clay loading, tensile modulus increases linearly while % break strain decreases. Break stress is found to increase till 4 wt % and further decreases at higher clay loadings. The overall improvement in thermal and mechanical properties was higher for the organoclay containing organic modifier with lower hydrophobicity and single tallow amine chemical structure. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007