Preparation and characterization of poly(methyl methacrylate)/multi-walled carbon nanotube composites.
Preparation and characterization of poly(methyl methacrylate)/multi-walled carbon nanotube composites.
复制标题
聚甲基丙烯酸甲酯/多壁碳纳米管复合材料的制备及表征。
DOI：
--
复制
发表时间：
2009
影响因子：
--
通讯作者：
C. Das
中科院分区：
文献类型：
--
作者：
S. Kumar;T. Rath;B. B. Khatua;A. K. Dhibar;C. Das
本文主要研究了聚甲基丙烯酸甲酯/多壁碳纳米管复合材料的非原位法和原位法制备及表征。用TEM、AFM、SEM和FESEM研究了复合材料的分散程度和断口形貌。原位制备的PMMA/MWNTs纳米复合材料的电导率在2.91wt%的负载量下比非原位制备的纳米复合材料的电导率增加更多。当MWNTs含量为4.76wt%时，纯PMMA的介电常数从5提高到72。此外，对于含有2.91wt%的MWNTs的非原位纳米复合材料，介电常数为15，而原位制备的PMMA/MWNTs纳米复合材料在同样的负载量为2.91wt%的MWNTs时显示出两倍的增加。当MWNTs含量小于4.76wt%时，PMMA/MWNTs复合材料的介电常数随频率的变化基本保持不变。动态力学分析表明，储能模量显着增加，特别是在较高的温度与4.76重量%的碳纳米管负载相比，纯PMMA。在T（g）之前的额外峰的存在表明CNT可以用于唤醒二次弛豫，这在纯PMMA中是不活跃的。热重分析（TGA）表明，PMMA/MWNTs纳米复合材料的热稳定性增加了45摄氏度（在N2）和27摄氏度（在空气中）在4.76重量%的MWNTs相比，纯PMMA。
This paper focuses on the preparation and characterization of Poly(methyl methacrylate)/multi-walled carbon nanotube composites through ex-situ and in-situ processes. The extent of dispersion and fracture morphology was studied by TEM, AFM, SEM and FESEM. The increase in conductivity at percolated loading of 2.91 wt% was more for in-situ prepared PMMA/MWNTs nanocomposite as compared to ex-situ prepared nanocomposites. The dielectric constant of pure PMMA was increased from 5 to 72 in the ex-situ prepared PMMA/MWNTs nanocomposites with 4.76 wt% of MWNTs loading. Moreover, for the ex-situ nanocomposites containing 2.91 wt% of MWNTs, the dielectric constant was 15, but in-situ prepared PMMA/MWNTs nanocomposite showed two times increase at same loading of 2.91 wt% of MWNTs. Dielectric constant of PMMA/MWNTs nanocomposites loaded with (< 4.76 wt%) of MWNTs remained almost constant with frequency. Dynamic mechanical analysis showed remarkable increase in storage modulus, especially at higher temperatures with 4.76 wt% loading of carbon nanotubes as compared to pure PMMA. The presence of additional peak before T(g) indicated that CNTs could be used to wake up secondary relaxations, which were inactive in pure PMMA. Thermogravimetric analysis (TGA) showed that thermal stability of PMMA/MWNTs nanocomposites increased by 45 degrees C (in N2) and 27 degrees C (in air) at 4.76 wt% of MWNTs as compared to the pure PMMA.