Materials Literature
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This paper discusses a direct (one-pot) polymerization process to prepare isotactic polypropylene (i-PP) having a terminal functional group including Cl, OH, and NH 2 . The chemistry involves metallocene-mediated propylene polymerization using rac -Me 2 Si[2-Me-4-Ph(Ind)] 2 ZrCl 2 /MAO complex in the presence of styre…
A series of aluminum complexes featuring with the ketiminate ligand, OCMeCHCMeNHAr (Ar = 2,6-(i)Pr(2)C(6)H(3), 1), have been prepared and characterized spectroscopically and structurally. Reactions of 1 with trialkylaluminum in 1:1 or 1:2 molar ratio generate four- and five-coordinated aluminum complexes (OCMeCHCMeNAr…
The influence of a basic aqueous solution on a hydrogen-bonding-directed layer-by-layer (LbL) self-assembled film, based on poly(acrylic acid) (PAA) and poly(4-vinylpyridine) (PVP), was investigated. The composition change of a multilayer film in a NaOH solution was monitored by X-ray photoelectron spectroscopy, Fouri…
We present the Monte Carlo with Absorbing Markov Chains (MCAMC) method for extremely long kinetic Monte Carlo simulations. The MCAMC algorithm does not modify the system dynamics. It is extremely useful for models with discrete state spaces when low-temperature simulations are desired. To illustrate the strengths and…
The Raman spectra of nuclear waste glasses are composed of large variations in half-width and intensity for the commonly observed bridging (Q0) and non-bridging (Q1 to Q4) bands in silicate structures. With increase in waste concentration in a boroaluminosilicate melt, the bands of quenched glasses are distinctly loca…
The cure characteristics and mechanical properties of short nylon fiber – styrene butadiene rubber/whole tyre reclaim (SBR/WTR) composites with and without an interfacial bonding agent based on 4,4 diphenyl methane diisocyanate and polyethylene glycol (MDI/PEG) have been studied. An 80:40 blend of SBR/WTR reinforced w…
The transformation between martensite and austenite is characterized by four transformation temperatures: martensite start temperature (Ms), martensite finish temperature (Mf), austenite start temperature (As) and austenite finish temperature (Af). In actuator design that relies on the shape memory effect, it is impor…
Open-pore flexible polyurethane (PUR)foams with various pore sizes (1–8 mm)were used as 3-D filler to reinforce low-density, closed-cell PUR flexible foam. The final composite has a “foam-in-foam” structure. Compared to the unfilled PUR flexible foam, the composite exhibits considerable improvement on mechanical prope…
We have derived a common analytical expression to describe angular magnetic oscillations observed in quasi-one-dimensional (Q1D) conductors (TMTSF) 2 X and (DMET) 2 I 3 . Among these are the Danner et al. oscillations, the “third angular effect", and very rich angular oscillations discovered by Lee et al. The physical…
Calculation of the change of work function Δφ at the surface of TiO2 due to the adsorption of Na, Ka, and Cs atoms has been carried out in the framework of a model taking into account the repulsion of adatoms and metallization of the adsorbed layer. The calculation results are in good agreement with experiment.
The microstructure and mechanical properties of hot-pressed alumina (Al 2 O 3 ) matrix composites containing 20, 35, or 50 vol% of nickel aluminide (NiAl) were investigated. The mean Al 2 O 3 grain size was found to decrease from approximately 2.0 μm (monolithic Al 2 O 3 ) to 1.0 μm for the composite containing 50 vol…
Granulocyte-macrophage colony stimulating factor (GM-CSF) activity has been linked to pro-inflammatory effects in autoimmune syndromes, such as rheumatoid arthritis. Thus GM-CSF mimetics with antagonist activity might play a therapeutic role in these diseases. The human GM-CSF core structure consists of a four alpha-h…
Chemical vapor deposition (CVD) diamond is an emerging material in the industry. Polishing CVD diamond film to approach the mirror-like state is necessary in a lot of applications, such as optical lens, missile radome, gyrotron windows, X-ray masks, heat sink, bio-sensors, UV detectors, etc. There are several kinds of…
Thermal diffusivities of actinide hydrides (UTh4Zr10Hx: x=18~27) have been measured in the temperature range from room temperature to 700~940 K by means of a laser-flash method. At high temperatures above 673 K, special specimen containers with sapphire window have been used to avoid composition change due to decompos…
The rheological properties of the stratum corneum of the pilot whale (Globicephala melas) were investigated with emphasis on their significance to the self-cleaning abilities of the skin surface smoothed by a jelly material enriched with various hydrolytic enzymes. The gel formation of the collected fluid was monitore…
Radiation sensitivity of glass is a general concern for the designer of Space optical instruments. ASTRIUM, in cooperation with SCK-CEN, has conducted a study (under ESA sponsorship) to define the approach for the gathering of a comprehensive database to quantify these effects through the use of linear sensitivity coe…
Although the study of metal-based polymers is a growing and important area of research, very few experiments involving these types of compounds are available for teaching labs. In this paper, we present such an experiment involving the preparation of three pyrazine-bridged coordination polymers of copper(II) nitrate a…
Abstract This paper presents an overview of the problem of modelling the ageing of polymeric insulating materials used for electrical applications; a relation between ageing and life models; the different approaches brought to phenomenological or chemical–physical life models; the need to search for diagnostic propert…
The volatility of compounds formed during heating of trace quantities of 238Pu or 239Pu in a stream of helium and oxygen mixture was studied by gas thermochromatography. Under certain conditions plutonium forms four adsorption zones with the centers at 450±25°C, 250±25°C, 130±50°C and -105±25°C in quartz TC columns. F…
Abstract The thermal stability of polymers is of fundamental importance both in processing and in many applications, eg, injection moulding, hot melts. As part of an investigation to determine the suitability of supramolecular polymers for novel applications in materials science, the thermal behaviour of two model com…