Nanocomposite

Epoxidized natural rubber–alumina nanoparticle composites were prepared by melt compounding with an internal mixer for a constant filler loading of 10 phr. Mixer parameters such as the mixing temperature, mixing time, and rotor speed were screened and optimized with response surface methodology to maximize the impact strength. The parameters were selected as three independent variables and the impact strength (J/m) was selected as the response in a screening factor study. The mixing temperature and its interaction terms were identified as insignificant factors with a P value greater than 0.0500. The optimum calculated values of the tested variables (rotor speed and mixing time) for the maximum impact strength were found to be a rotor speed of 60 rpm and a mixing time of 6 min with a predicted impact strength of 208.88 J/m. These predicted optimum parameters were tested in real experiments. The final impact strength was found to be close to the predicted value of 215.84 J/m, with only a 3.33% deviation. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

In this work, we simulated modified organoclay exfoliation and intercalation at an atomistic level, thus providing information about the rational choice of compatibilizers and polymer insertions behavior. Phase morphology and segregation domains have then been obtained ...

Environmental contamination and human exposure to dyes have dramatically increased over the past decades because of their increasing use in such industries as textiles, paper, plastics, tannery and paints. These dyes can cause deterioration in water quality by imparting color to the water and inducing the photosynthetic activity of aquatic organisms by hindering light penetration. Moreover, some of the dyes are considered carcinogenic and mutagenic for human health. Therefore, efficient treatment and removal of dyes from wastewater have attracted considerable attention in recent years. Photocatalysis, due to its mild reaction condition, high degradation, broad applied area and facile manipulation, is a promising method of solving environmental pollution problems. In this paper, we report the synthesis of graphene oxide-tin oxide (GO-SnO2) nanocomposite and the effectiveness of this composite in decolorizing Methylene Blue. Tin oxide was prepared by liquid phase co-precipitation meth...

Now-a-days, the exploitation activities have moved into the deeper oil and gas formations in hostile High Pressure High Temperature (HPHT) environment that demands state-of-the-art and sophisticated drilling fluids basically for the pay zones. Due to their high temperature instability, the simple polymer based mud systems are not suitable for the HPHT wells. The major challenges in HPHT conditions include low penetration rate, excessive torque and drag, poor hole cleaning, dif erential pipe sticking and formation damage. These complications can be controlled by maintaining proper rheological properties as well as filtration loss properties in the mud systems. But, it is very dif icult to maintain these properties of conventional pay zone drilling fluids under HPHT conditions due to the presence of high molecular weight polymers in the mud. This work exhibits synthesize and evaluation of polymer nanocomposites as additives for a novel cost effective, efficient, environment friendly, and fit-for-the- purpose nanocomposite based Reservoir Drilling Fluid (RDF) system for the pay zones or reservoir sections of the HPHT wells.

Cellulose  TiO 2 nanoparticles  dielec-tric properties  electrical conductivity  epichlorohydrin  glutardialdehyde This work deals with preparation, characterization and dielectric evaluation of cellulose/titanium dioxide nanopartic-les. These nanocomposites were successful prepared via emulsion technique in the presence of two different crosslin-kers such as epichlorohydrin and glutar-dialdehyde. The nanocomposites were characterized using infrared spectrosco-py, thermogravimetric analysis, scanning and transmitting electron microscopes and the dielectric measurements were investigated. The results indicated that TiO 2 was physically adsorbed and distributed between the cellulosic fibers. Du to the polarization effect, the dielectric parameters were increased in the case of using epichlorohydrin, while they had low values in the case of using glutardialdehyde. The presence of TiO 2 enhanced the AC conductivity. Rationelles Design von Cellulose/ Titandioxid-Nanokompositen Cellulose  TiO 2-Nanopartikel  dielekt-rische Eigenschaften  elektrische Leit-fähigkeit  Epichlorhydrin  Glutardial-dehyd Diese Arbeit befasst sich mit der Vorbe-reitung, Charakterisierung und dielektri-schen Bewertung von Cellulose/Titan-dioxid-Nanopartikeln. Diese Nanokom-posite wurden erfolgreich in Emulsions-technik in Gegenwart von den zwei verschiedenen Vernetzern Epichlorhyd-rin und Glutardialdehyd hergestellt. Die Nanokomposite wurden mittels Inf-rarotspektroskopie, Thermogravimetrie, Raster-und Transmissionselektronen mikroskopie charakterisiert und hin-sichtlich den dielektrischen Eigenschaf-ten untersucht. Die Ergebnisse zeigten, dass TiO 2 zwischen den Zellulosefasern physikalisch adsorbiert und verteilt war. Im Vergleich zum Polarisationseffekt waren die dielektrischen Eigenschaften im Fall der Verwendung von Epichlorhy-drin erhöht, während sie bei der Ver-wendung von Glutardialdehyd ernied-rigt sind. Figures and Tables: By a kind approval of the authors.