Materials Literature
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Abstract When plastic film packaging is processed for reuse, residual ink colors the polymer and makes the polymer less stiff, weaker, and denser than the original material. These problems can be avoided if the printing is removed from the plastic film surface. In this study, a commercial polyethylene film with water‐…
Abstract A model for particle settling velocities in polydisperse suspensions is proposed alongside normalized particle self and interaction mobilities. The model predictions are compared with other models (Davis and Gecol, 1994; and Al‐Naafa and Selim, 1989), as well as published experimental data. A general agreemen…
A new type of 110 kV and 220 kV whole-solid-insulation polymeric ZnO surge arresters are developed. The power loss characteristics of ZnO varistors are discussed, which are simulated by an artificial neural network (ANN) model. The thermal performances of the new developed polymeric arresters are analyzed by the finit…
Abstract An alternative catalyst to the traditional KOH was studied for preparation of polyols, having high molecular weight (about 6 000 g mol −1 ) and low unsaturation content. KOH catalyst is useful until the equivalent weight of the polyol reaches about 1 000 g mol −1 , at which point an excess of allylic terminal…
Na sociedade contemporânea, uma solução ou um equacionamento minimamente satisfatório para os graves problemas ambientais decorrentes da larga utilização de polímeros tem se constituído num dos grandes desafios colocados para a comunidade científica. Na busca por soluções desejáveis, e como alternativa aos polímeros c…
The structural phase transition between the polymorphs of syndiotactic polystyrene has been studied by means of molecular dynamics simulation. It was found that the initial δe form of the crystal structure was completely transformed into the γ form by thermal treatment. Not only the crystal structure but also the tran…
The tensile, impact and bending properties of calcium carbonate (CaCO 3 ) filled acrylonitrile-butadiene-styrene copolymer (ABS) composites were measured at room temperature. It was found that the tensile modulus increased nonlinearly with increasing the weight fraction φ + of the fillers, and the tensile strength and…
An experimental study of the oxidation of pyridine both in the absence and in the presence of NO has been performed. The experiments were conducted in an isothermal quartz flow reactor at atmospheric pressure in the temperature range 700-1500 K. The influence of temperature, air excess ratio (corresponding to fuel-ric…
When grown under K+ limitation, Escherichia coli induces the K+-translocating KdpFABC complex. The stimulation of ATPase activity by NH4+ ions was shown for the first time. Substitutions in KdpA, which is responsible for K+ binding and translocation, revealed that enzyme complexes KdpA:G232A and KdpA:G232S have comple…
In this paper, we propose a new method for measuring fabric wrinkling based on integrating photometric stereo and image analysis techniques. In the traditional method. wrinkled fabrics are evaluated subjectively according to the grades of replica plates supplied by the American Association of Textile Chemists and Colo…
Hydrogen embrittlement tests were carried out using double cantilever beam and slow strain rate tensile specimens to measure the susceptibility of a 900 MPa yield strength steel in different marine environments, ranging from sterile sea water and filtered natural sea water to open sea water and seabed sediment. The ca…
As part of an effort to develop high performance/high temperature materials for composite fabrication via resin transfer molding (RTM) and resin infusion (RI), phenylethynyl-containing imide oligomers (PEIs) have been investigated. Uncured resins with low and stable melt viscosities and when cured, high glass transiti…
A concept combining optics and microwave pulses with the negative charge-state of the nitrogen-vacancy (NV—) center in diamond is demonstrated through experiments that are equivalent to single-qubit gates, and decoherence for this qubit is examined. The spin levels of the ground state provide the two-level system. Opt…
Thermal analyses (DTA and TG) were carried out on sturmanite and ettringite from the Kalahari Manganese Field, South Africa. The TG trace for sturmanite, approximately Ca6(Fe 3+ 1.5Al0.3Mn 2+ 0.2)2.0{[B(OH)4]1.2(SO4)2.3}3.5(OH)12•25H2O, indicates that H2O(g) is lost at about 135°C, SO3(g) is lost at about 1349°C, and…
Hexafluoro-2-propanol (HFIP) exhibits a unique ability to release and activate H2O2 from the urea-hydrogen peroxide adduct (UHP). This UHP/HFIP system was investigated in epoxidation of olefins, using various fluoroketones as catalysts. With reactive olefins, no catalyst was required. With monosubstituted olefins, epo…
Pré-polímeros fenólicos e lignofenólicos (substituição de 40% em massa de fenol por lignina, extraída do bagaço de cana) foram sintetizados para preparar compósitos com matrizes termofixas, usando bagaço de cana-de-açúcar como agente de reforço. Este material lignocelulósico foi modificado por métodos químicos e/ou fí…
The Favimat, a single fiber testing machine, is used to quantify the affects of cotton crimp on fibers from three samples consisting of cottons containing low, high, and ideal micronaire values for textile processing. In order to get a better representation of all fibers within these samples, the cotton is further div…
Abstract The principle of multilayer interphases was proposed earlier for modifying the mechanical properties and UV stability of various multicomponent polymer systems. This paper focuses on the applicability of this principle for improving the performance of intumescent flame‐retardant systems using melamine‐treated…
The first synthesis and characterization of gold−silica core−shell nanoparticles with a mercaptosilane interface between the core and shell is reported. These nanoparticles exploit the strong interaction between thiols and gold to create a well-defined interface of functional group organization between core and shell.…
Crystalline nanobelts of ZnO and SnO2 were prepared from a thermal evaporation of oxide powders inside an alumina tube in the absence of catalysts. Typical dimensions of the nanobelt samples ranged from approximately 10 to 100 microns in length, 30 to 300 nm in width, and 6 to 30 nm in thickness. Room temperature Rama…