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首页> 外文期刊>Advanced Functional Materials >Enhancement of modulus, strength, and toughness in poly(methyl methacrylate)-based composites by the incorporation of poly(methyl methacrylate)-functionalized nanotubes
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Enhancement of modulus, strength, and toughness in poly(methyl methacrylate)-based composites by the incorporation of poly(methyl methacrylate)-functionalized nanotubes

机译：通过引入聚甲基丙烯酸甲酯功能化的纳米管，增强基于聚甲基丙烯酸甲酯的复合材料的模量，强度和韧性

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摘要

Poly(methyl methacrylate) (PMMA)-functionalized multiwalled carbon nanotubes are prepared by in situ polymerization. Infrared absorbance studies reveal covalent bonding between polymer strands and the nanotubes. These treated nanotubes are blended with pure PMMA in solution before drop-casting to form composite films. Increases in Young's modulus, breaking strength, ultimate tensile strength, and toughness of x1.9, x4.7, x4.6, and x13.7, respectively, are observed on the addition of less than 0.5 wt % of nanotubes. Effective reinforcement is only observed up to a nanotube content of approximately 0.1 vol %. Above this volume fraction, all mechanical parameters tend to fall off, probably due to nanotube aggregation. In addition, scanning electron microscopy (SEM) studies of composite fracture surfaces show a polymer layer coating the nanotubes after film breakage. The fact that the polymer and not the interface fails suggests that functionalization results in an extremely high polymeranotube interfacial shear strength.
机译：通过原位聚合制备聚甲基丙烯酸甲酯（PMMA）-官能化的多壁碳纳米管。红外吸光度研究揭示了聚合物链和纳米管之间的共价键。在滴铸之前，将这些处理过的纳米管与纯PMMA在溶液中混合，以形成复合膜。当添加少于0.5wt％的纳米管时，观察到杨氏模量，断裂强度，极限拉伸强度和韧性分别增加x1.9，x4.7，x4.6和x13.7。仅观察到有效的增强直至纳米管含量为约0.1体积％。高于此体积分数，所有机械参数趋于下降，这可能是由于纳米管聚集所致。此外，复合断裂表面的扫描电子显微镜（SEM）研究表明，膜破裂后，聚合物层覆盖了纳米管。聚合物而不是界面失效的事实表明官能化导致极高的聚合物/纳米管界面剪切强度。

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