Wear Characterizations of Polyoxymethylene (POM) Reinforced with Carbon Nanotubes (POM/CNTs) Using the Paraffin Oil Dispersion Technique

Flexural, impact, rheological and physical characterizations of POM reinforced by carbon nanotubes and paraffin oil

“…The brittle fracture is considered more serious because it does happen suddenly. Previous studies on the plastic yielding of CNT/POM showed that the plastic yielding increased by adding CNT until 0.02 wt% then decrease gradually at 0.03 wt%, and linear relationship was noted …”

“…Additionally, the σ f and E f of the CNT was noted to be higher than that of the POM, leading to increasing the flexural modulus of the CNT/POM composite . Also, the crystallization behavior of POM (PC 0 ) has improved CNT presence . After this amount of CNT for PC 3 sample, σ f and E f decreased (13 and 21% respectively) because of the agglomeration of CNT in the POM matrix leading to poor dispersion.…”

“…It is worth mentioning that a new dispersion technique for PO in POM has been investigated in the recent literature and reported to produce a significant improvement in mechanical properties, in particular the strength and modulus by about 22 and 30% respectively. A 6% increase in the melting temperature and 7% improvement in the degree of crystallinity were also noted in the thermal properties …”

“…Here, = 187 + 273 ° K is the extrapolated equilibrium melting temperature of a POM crystal of infinite thickness, T m ( ° K) is the melting peak absolute temperature of pristine POM and CNT/POM (measured by TA INSTRUMENTS Thermo DSC Q 100), σ e = 122 J cm −2 is the lamellar basal surface free energy, and Δh f = 3.78 × 10 9 J cm −3 is the heat fusion per unit volume …”

“…Through similar testing method, a pin on disk was employed to measure the sliding wear rate of CNT/POM in three different operating media (air, distilled water and mineral oil). The results showed that the air medium provides the greatest reduction in wear rate while the oil medium the lowest . On the other hand, POM characterized by low water absorption leads to increase the contact angle, thus improved the wettability …”