Materials Literature
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Maleated natural rubber was modified by introducing different contents of cinnamate groups, separated from the main chain by —(CH2)n— spacers (n = 2 to 6). Residual carboxylic acid groups were neutralized as Li, Na, and K-salts. The kinetic behavior of these materials towards ultraviolet-induced crosslinking reaction…
The formation of bauxite from a granitic protolith, at 25°C, has been simulated using a modified version of the 1DREACT software for one-dimensional reactive transport, which uses a kinetic approach to describe the mineral dissolution and precipitation reactions. The rate laws describing these reactions incorporate th…
Computational models for analyzing in-reactor behavior of metallic fuel pins in liquid-metal reactors under steady-state conditions are developed and implemented in the Metal fuel performance Analysis (computer) Code for Simulating the In-reactor behavior under Steady-state conditions (MACSIS). Sodium logging and cons…
The use of different clay minerals as support materials in anaerobic digestion has been studied. The support materials were evaluated in a batch microdigester and their effect on the digestion process was measured at the beginning of the process (startup) and at an intermediate point of the digestion process when the…
UV−visible spectroscopy and H NMR spectroscopy were used to investigate the kinetics and the mechanisms of the chemical imidization for low molecular weight model monoamic acid and bisamic acid. Acetic anhydride and pyridine were used as the dehydrating mixture. The reaction was found to proceed by simultaneous format…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTWholly Aromatic Polyimides Containing Pendent Amino and Cyano GroupsIm Sik Chung and Sang Youl KimView Author Information Center for Advanced Functional Polymers, Department of Chemistry, Korea Advanced Institute of Science and Technology, 373-1, Kusung-Dong, Yusung-Gu, Taejon,…
A new series of cyclotriphosphazenes bearing Schiff bases with different carbon number alkoxy end groups(HAICP) in the side chains were synthesized and their phase transitions and liquid crystallinity were studied using DSC measurements and polarizing microscope observations. We found a monotropic Sml phase for n = 3…
We report measurements of the specific heat ${C}_{p}(T)$ and of the thermal conductivities ${\ensuremath{\lambda}}^{p}(T)$ along the periodic direction and ${\ensuremath{\lambda}}^{q}(T)$ along a direction in the quasiperiodic plane for decagonal Al-Ni-Co at low temperatures. The coefficient $\ensuremath{\gamma}=0.63$…
A four layered compound LaBi4FeTi3O15 has been synthesised by the ceramic route. Polycrystalline samples were prepared by uniaxial pressing and cold isostatic pressing with a view to study the effect of different compaction techniques on the physical properties of the compound. The lattice parameters were evaluated an…
Bolaamphiphile with a glycylglycine unit at each end, N,N′-bis(carboxymethylcarbamoylmethyl)decane-1, 10-dicarboxamide, has been synthesized. The crystal structure was determined by single-crystal X-ray analysis. The space group is P21/a with unit cell parameters: a = 8.678(3), b = 4.873(4), c = 27.161(3) Å, β = 92.68…
Abstract Polybutadiene rubber with 10% vinyl unsaturation has been crosslinked without the addition of any vulcanization chemicals. The crosslinks have been created through treatment at high temperature (240–250°C) and elevated pressure (<293 MPa) in a plunger type mold. The treatment time needed to achieve a cross…
Abstract Every year great quantities of chrome tanned leather wastes produced by the footwear and clothing industries are buried or burned. These practices produce several contaminants that are released into the environment. An alternative to disposing of these wastes is to reuse them. In this work, a method to use th…
The problem of diffusional interactions in a finite-sized cluster of spherical particles is studied. Simulations of diffusional interactions with size distribution and volume fraction ${V}_{v},$ as input parameters, referred to as snapshot (static) simulations, are compared with dynamic (time-dependent) simulation res…
Real surfaces are not flat on an atomic scale. Studying the effects of roughness on microstructural evolution is of relevance because films are sputtered onto nonideal surfaces in many applications. To this end, amorphous rough substrates of two different morphologies, either elongated mounds or facets, were fabricate…
Engineered manufacturing of high quality garments has long been a target of textile technology. There are three main factors for manufacturing high quality garments. They are: the selection of good fabrics for the garments; the process control of garment manufacturing; and the performance and correct adjustment of man…
The effects of W on the precipitation behaviour of 25 Cr-6Ni base super duplex stainless steels with various Mo and W contents have been examined following heat treatments in the temperature range 700–1050°C. Upon aging, the major intermetallic phase of the duplex stainless steel containing Mo was σ phase. In duplex s…
Space-charge distributions in plate and coaxial cable samples of various polyethylene (PE) materials such as high density polyethylene, linear low density polyethylene, low density polyethylene, and cross-linking polyethylene under dc voltage are systematically investigated by the pulsed electro-acoustic method. The c…
A variety of photostructural changes observed in tetrahedral and chalcogenide amorphous semiconductors are reviewed from physical and chemical points of view. In particular, observations of the photodarkening and related phenomena in chalcogenide glasses are summarized, and structural models which have been proposed s…
Corrosion of steel equipment from oil-containing water has been a significant problem in the petroleum industry for many years. Despite this known problem, essentially no methodical study has been performed to elucidate the mechanisms. Moreover, no attempts have been made to predict corrosion in predominately oil-base…
Abstract The study of structure and properties of semi‐crystalline polymer inter‐phases is important to explain and extend polymer applications. In this region, polymer chains exist in three distinct populations: tie chains that bridge the two crystals, chain folds and chain ends. The distribution of these populations…