Nanocomposites of Polyoxymethylene

Abstract

Recent research results in the area of nanocomposites and nanostructured materials based on polyoxymethylene (POM) are reviewed in this chapter. Improvement of diff erent properties, such as mechanical strength, electrical conductivity, tribological properties, thermal stability and biocompatibility, are reported for these new POM-based materials, which indicate their high potential in structural and functional applications. As nanofi llers for POM-layered silicates, fullerenes, carbon nanotubes and nanofi bers, polysilsesquioxanes (POSS), nanostructural hydroxyapatite or nanoparticulate oxides such as titanium dioxide, nanosilica, zirconium oxide and zinc oxide, are applied. Nanocomposites based on POM and diff erent types of nanofi llers reveal superior properties compared to conventional POM composites, but the amount of additive remains lower. Th e infl uence of nanofi ller type, manufacturing techniques, role of interfacial properties and kind of applied surface modifi cation of nanoparticles on the control of generated nanostructure is discussed. Moreover, complex morphology and properties of electrospun POM nanofi bers are analyzed with respect to the nanomaterials manufacturing conditions.

Dielectric relaxation mechanisms in polyoxymethylene/polyurethane/layered silicates hybrid nanocomposites

“…Blending POM with thermoplastic polyurethane (PU) is often proposed as a reliable solution for POM toughening [11][12][13]. A variety of methods have been developed for the preparation of POM based nanocomposites, including in situ polymerization, melt blending, and solution/dispersion techniques, aiming to overcome serious challenges and achieving uniform dispersion of the nanofiller in the polymer matrix and obtaining good interfacial adhesion between the nanoparticles and the polymer [14]. Within the framework of the present work, we examine the influence of the preparation technique on the morphological characteristics and on the dielectric response of POM/PU/LS ternary systems prepared by two methods: (a) direct melt (DM) compounding and (b) latexmediated masterbatch (MB) technique.…”

The Mechanical and Thermal Properties of Polyoxymethylene (POM)/Organically Modified Montmorillonite (OMMT) Engineering Nanocomposites Modified with Thermoplastic Polyurethane (TPU) Compatibilizer

“…Through the last decades nanocomposites of almost all large-scale produced polymers (e.g. PE, PP, PA, PS, PVC or PC) were obtained and characterized, but there are only few works presented in literature concerning POM/layered silicate nanocomposites [9][10][11]. Xu et al have investigated the nonisothermal crystallization kinetics of POM, POM/MMT and POM/OMMT nanocomposites and found significant changes in the mechanism of nucleation of POM crystals in neat polymer as compared to the nanocomposite matrix [9].…”

“…The heterogeneous nucleation mechanism and higher crystallization rates were found for nanocomposite materials. In our early publication concerning the POM/OMMT nanocomposites we have discussed the effect of chemical constitution of ammonium surfactant on the structure, crystalline morphology as well as mechanical and thermal properties of nanocomposites [10,11]. The best performance was observed for samples with ammonium surfactant incorporating two long alkyl chains due to highly ordered structure of obtained nanocomposites.…”