Influence of carbon nanotubes on the rheology and dynamic mechanical properties of polyamide-12 for laser sintering
Influence of carbon nanotubes on the rheology and dynamic mechanical properties of polyamide-12 for laser sintering
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DOI：
10.1016/j.polymertesting.2014.03.012
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发表时间：
2014-06-01
期刊：
影响因子：
5.1
通讯作者：
Okamoto, Masami
中科院分区：
文献类型：
--
作者：
Bai, Jiaming;Goodridge, Ruth D.;Okamoto, Masami
聚合物纳米复合材料的流变行为对于聚合物加工和理解结构-性能关系具有重要意义。研究了一种用于激光烧结的聚酰胺12（PA 12）-碳纳米管（CNT）纳米复合材料的流变性能。与纯PA 12相比，CNT的存在导致更高的储能模量（G '）、损耗模量（G”）和粘度（η）。随着温度的升高，PA 12和PA 12-CNT纳米复合材料的粘度都显示出不寻常的增加，这可能是由于粉末颗粒的不完全熔融。进行动态力学分析以检查CNT对激光烧结部件的影响。与纯PA 12相比，激光烧结的PA 12-CNT纳米复合材料的弹性模量有所增加。碳纳米管和聚合物基体的相互作用阻碍了链的运动，从而导致更高的损耗模量和降低的热膨胀系数。皇冠版权所有（c）2014由爱思唯尔有限公司出版。
The rheological behaviour of polymer nanocomposites is very important for polymer processing and understanding the structure-properties relationship. In this paper, the rheological properties of a polyamide 12 (PA12) - carbon nanotube (CNT) nanocomposite for laser sintering were studied. Compared to neat PA12, the presence of CNTs resulted in higher storage modulus (G'), loss modulus (G") and viscosity (eta). With an increase in temperature, viscosity showed an unusual increase for both PA12 and the PA12-CNT nanocomposites, which is likely to result from incomplete melting of powder particles. Dynamic mechanical analysis was carried out to examine the effect the CNTs were having on the laser sintered parts. The laser sintered PA12-CNT nanocomposite had an increased elastic modulus compared to that of neat PA12. The CNT and polymer matrix interaction hindered the chain motions, which resulted in higher loss modulus and decreased the thermal expansion coefficient. Crown Copyright (c) 2014 Published by Elsevier Ltd.