2134/17906
Jiaming Bai
Jiaming
Bai
Ruth Goodridge
Ruth
Goodridge
Richard J.M. Hague
Richard J.M.
Hague
Mo Song
Mo
Song
Masami Okamoto
Masami
Okamoto
Influence of carbon nanotubes on the rheology and dynamic mechanical properties of polyamide-12 for laser sintering
Loughborough University
2015
Polymer-matrix composites
Rheological properties
Powder processing
Laser sintering
Materials Engineering not elsewhere classified
Mechanical Engineering
2015-06-17 13:22:01
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Influence_of_carbon_nanotubes_on_the_rheology_and_dynamic_mechanical_properties_of_polyamide-12_for_laser_sintering/9235049
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 (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.