Investigation on morphology and properties of melt compounded polyoxymethylene/carbon nanotube composites

Abstract

Polyoxymethylene nanocomposites containing different contents of carbon nanotubes were produced by a two‐step melt compounding process using a twin‐screw extruder. The dispersion quality, thermal and mechanical properties, and the creep as well as the tribological behaviors of the nanocomposites were investigated. Morphological investigations show that the masterbatch dilution process significantly improves the dispersion quality of carbon nanotubes within polyoxymethylene matrix, and as a consequence, enhanced mechanical properties and creep resistance are gained. Furthermore, to predict the long‐term property based on the short‐term experimental data, the time–temperature superposition principle and Findley model were used. Master curves with extended time scale are constructed using time–temperature superposition principle to horizontally shift the short‐term experimental data. The simulated results confirm the reinforced creep resistance by incorporation of the carbon nanotubes into the polymer matrix even at extended long time scale. By contrast, the tribological performance of polyoxymethylene was remarkably impaired after adding carbon nanotubes. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42639.

Environmental stress cracking (ESC) resistance of polycarbonate/SiO2 nanocomposites in different media

“…Young's modulus, tensile strength, and elongation at break of the different materials are depicted in Figure (b–d), respectively. As expected and already demonstrated for various materials, the addition of nano‐SiO 2 increases the modulus and slightly improves the tensile strength of the material, and decreases the elongation at break. The best compromise of stiffness, strength and ductility is achieved at a filler content of v f = 1 vol %.…”

Improved weld strength of vibration welded polyoxymethylene/multiwalled carbon nanotubes hybrid nanocomposites

“…a). The tensile strength of POM increases by increasing filler concentration in the studied range, which has been reported in our previous study . Since the load bearing capacity of the CNTs strongly depends on the level of their dispersion in the POM matrix, the inherent strength of agglomerated CNTs is clearly not sufficient to create substantial reinforcement.…”

Microinjection molding of polyoxymethylene/multiwalled carbon nanotubes composites with different matrix viscosities

“…This observation is consistent with the findings by Wacharawichanant et al 44 as well as Lin and Schlarb. 45 However, the melting behavior for both types of POM-based composites is greatly affected by the introduction of CNT, as displayed in Figure 4. The χ c obtained from the 1st melting cycle (i.e., Cycle 1) of CNTcontaining composites varies greatly with the presence of CNT.…”