Influence of carbon nanotubes on the rheology and dynamic mechanical properties of polyamide-12 for laser sintering

• DOI: 10.1016/j.polymertesting.2014.03.012
• Publication Date: 2014-03-25T05:06:44Z
• Authors: Jiaming Bai; Ruth D. Goodridge; Richard J.M. Hague; Mo Song; Masami Okamoto
• Keywords: Powder processing; Polymers and Plastics; Polymer-matrix composites; Organic Chemistry; Rheological properties; Laser sintering; 02 engineering and technology; 0210 nano-technology

AbstractThe 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 (η). 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.