Multi-walled carbon nanotube in a miscible PEO/PMMA blend: Thermal and rheological behavior
Multi-walled carbon nanotube in a miscible PEO/PMMA blend: Thermal and rheological behavior
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可混溶 PEO/PMMA 共混物中的多壁碳纳米管：热和流变行为
DOI：
10.1016/j.polymertesting.2019.03.003
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发表时间：
2019
期刊：
影响因子：
5.1
通讯作者：
Liu Chuntai
中科院分区：
文献类型：
--
作者：
Zhang Can;Liu Xianhu;Liu Hu;Wang Yaming;Guo Zhanhu;Liu Chuntai
聚合物共混物及其复合材料的热行为和流变行为对材料的性能和应用有着重要的影响。采用熔融共混法制备了多壁碳纳米管（MWCNTs）填充的聚环氧乙烷/聚甲基丙烯酸甲酯（PEO/PMMA 60/40）共混物。DSC结果表明，多壁碳纳米管的加入不仅提高了结晶温度，而且增加了结晶度。动态振荡测试结果表明，PEO/PMMA共混物的储能模量在低频区符合典型的末端行为，这是由于PEO与PMMA之间具有良好的相容性。随着多壁碳纳米管含量的增加，储能模量与角频率曲线在低频的斜率低于纯共混物。此外，高浓度复合材料的熔体粘度在低频下增加。蠕变回复实验结果表明，当纳米填料含量达到4%时，复合材料的零剪切粘度已不存在。这些表明，当MWCNTs浓度高达4wt%时，复合材料表现出从液态到固态的转变。
Thermal and rheological behaviors have a significant impact on the properties and applications of polymer blends and their composites. In this work, multi-walled carbon nanotubes (MWCNTs) filled poly (ethylene oxide)/poly (methyl methacrylate) (PEO/PMMA 60/40) blends with various MWCNTs concentrations were prepared via melt mixing. The DSC results indicate that the incorporation of MWCNTs not only raise the crystallization temperature but also increase the crystallinity. According to the results of dynamical oscillatory measurements, the storage modulus in accordance with the typical terminal behavior at low-frequency region for the blank PEO/PMMA blends, due to the well miscibility between PEO and PMMA. As the MWCNTs increase, the slope of storage modulus versus angular frequency plots in the low-frequency is lower than neat blend. Moreover, the melt viscosity of high concentration composites increases at low frequencies. The creep-recovery experiments results show that when the nanofiller concentration reaches 4%, the zero-shear viscosity of the composites does not exist. These suggest that the composites exhibit a transformation from liquid-like to solid-like states when the MWCNTs concentration is up to 4 wt%.