The use of different alumina fillers for improvement of the mechanical properties of hybrid PMMA composites

Abstract

Alumina fillers having different morphologies were used for reinforcement of PMMA-based composite materials. The employed fillers had the same chemical composition but morphologically were spherical nanoparticles, whiskers and an electrospun product that was composed of micro-sized mostly spherical particles and nanofibers. The electrospun product was obtained from aluminum chloride hydroxide/PVA/water solution. All fillers were added without surface treatment and mechanical characteristics of obtained composites were determined using dynamic mechanical analysis (DMA) and nanoindentation. From the nanoindentation results, the reduced elastic modulus for the obtained specimens using 3 wt.% of electrospun product was 134% of the one obtained with the polymer alone and the hardness was improved to 157.8% compared to the polymer without any additive. DMA shows that the storage modulus at room temperature was twice that of the polymer alone.

Alumina particles doped with ferric as efficient adsorbent for removal of Reactive Orange 16 from aqueous solutions

“…Once a site is occupied, no further adsorption can take place at that site. This indicates that the surface reaches a saturation point where the maximum adsorption of the surface is achieved [7,23]. The same type of saturated adsorption was reported for the adsorption of RO16 on porous chitosan-polyaniline/ZnO hybrid composite [20], and Methyl Orange on mesoporous alumina nanofibers prepared by electrospinning from aqueous solutions [16] as well for other azo dyes [19,21].…”

“…The forms of the adsorbent varies from ordered structures, ceramic fibers or powders [6]. The form that has the best mechanical properties is corrundum, but is rather poor as the adsorbent and is mostly used as the reinforcement in composite materials [7,8]. In the present study, alumina particles doped with ferric oxide were prepared by sol-gel technique and their adsorption characteristic for the removal of the Reactive Orange 16 (RO16) dye from aqueous solution was studied.…”

The novel modeling approach for the study of thermal degradation of PMMA/nanooxide systems

“…Fifteen of the required sixteen parameters have to be determined in order to apply Eq. (8). The unknown parameters are found by minimizing the following function:…”

“…In the recent past, many research studies have attempted to improve thermal stability and to design optimal end-use properties of PMMA by adding different fillers (organoclays, alumina, silica, titania, zinc oxide, zirconium oxide and iron oxide) into the low viscosity monomers [7][8][9]. Different effects of various inorganic additives on the thermal stability and degradation of PMMA were assessed.…”

Dimethyl Itaconate Modified PMMA ‐ Alumina Fillers Composites With Improved Mechanical Properties

“…Oxygen sublattice of α ‐Al 2 O 3 is hexagonal close‐packed crystal structure; while transition alumina ( γ , η, κ, θ ) has a face‐centered cubic crystal structure that determine the density and the properties of each. α ‐Al 2 O 3 has high hardness and it is mostly used to achieve reinforcement effect . γ ‐Al 2 O 3 with loosely crystal structure has a higher specific surface area than α ‐Al 2 O 3 and exhibits high absorptive performance .…”