Impact behaviour of polypropylene filled with multi-walled carbon nanotubes
Impact behaviour of polypropylene filled with multi-walled carbon nanotubes
复制标题
DOI：
10.1016/j.eurpolymj.2007.05.010
复制
发表时间：
2007-08
影响因子：
6
通讯作者：
Hui Zhang;Zhong Zhang
中科院分区：
文献类型：
--
作者：
Hui Zhang;Zhong Zhang
采用双螺杆挤出法制备了多壁碳纳米管/聚丙烯复合材料。在此实验中，分别采用1-2μm和5-15μm的不同长度的纳米管，体积含量为1%。缺口Charpy冲击试验表明，纳米管的增韧效果与试验温度密切相关。当温度高于基体玻璃化转变温度时，抗冲击性能显著增强。与较短的纳米管相比，较长的纳米管在增韧方面表现得更有效。纳米管填充聚丙烯的抗冲击性能的提高是由于其承载能力的增强和基体变形的显著增加。SEM断口形貌进一步揭示了微观尺度下的增韧机制。纳米管的断裂和拔出提高了冲击能，这可能导致一系列的能量消耗行为。此外，纳米管诱导的球晶尺寸越小，对抗冲击性能也有一定的促进作用。
Multi-walled carbon nanotubes/polypropylene composites were compounded using a twin-screw extruder. Here, nanotubes with different lengths, i.e. 1–2μm and 5–15μm, respectively, were applied at a constant volume content of 1%. Notched Charpy impact tests showed that toughening effects of nanotubes depended highly on testing temperatures. The impact resistance was notably enhanced at a temperature above the glass transition temperature of matrix. Longer nanotubes performed more effective in toughening compared to the shorter ones. The increment of impact resistance of nanotube-filled polypropylene was considered due to enhanced load-carrying capability and much-increased deformation of matrix. SEM fractography further revealed the toughening mechanisms in a micro-scale. The impact energy was improved via nanotube breakage and pullout, which likely led to a series of energy consuming actions. In addition, the smaller spherulite size induced by nanotubes would be favourable to the impact resistance partially.