Abstract
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.
Highlights
Additive Manufacturing (AM) is a group of technologies which are applied to produce end-use products directly from 3D model data
At 230 C, the samples were in the molten state, and acted as viscous liquids, which can explain the G0 < G00 for both polyamide 12 (PA12) and PA12-carbon nanotube (CNT) nanocomposites
Parallel oscillatory test results demonstrated that CNTs have a substantial effect on the melt rheological properties of the PA12-CNT nanocomposites, as the storage modulus G0, loss modulus G00 and viscosity h of the PA12-CNT nanocomposites increased compared to PA12
Summary
Additive Manufacturing (AM) is a group of technologies which are applied to produce end-use products directly from 3D model data. The results indicated the existence of strong interactions between polymer matrix and nanoclay, and the formation of some particle network structure and randomly oriented silicate layers These rheological studies with conventional polymer nanocomposites could be carried out on polymer nanocomposites for laser sintering to offer a fundamental understanding of the processability of these materials, as well as the structure-properties relationship in the nanocomposites. A comprehensive rheological investigation of a polymer nanocomposite for laser sintering was carried out to examine the influence of the nanofiller on the rheology properties of the polymer matrix Due to their excellent mechanical, thermal and electrical properties, carbon nanotubes are considered to be ideal reinforcing nanofillers for polymers [16] and were, chosen as the nanofiller. The effect of the CNTs on the modulus and damping of the laser sintered PA12 samples was analysed
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