Materials Literature
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Adhesion strength of a photoresist during pattern development decreases as penetration of an alkaline aqueous solution into the photoresist film increases. The penetration is accelerated by increasing the quantity of residual solvent in the photoresist film. Resistance measurements confirmed the penetration. The tensi…
In order to understand cathodic reactions of Ti-based alloys, local electronic states of the cathode were simulated by a DV-Xα cluster method. A local electronic cell model was assumed here, in which the anode is the titanium-matrix region and the cathode is the alloying-element containing region. The cathodic reactio…
The history of precoated steel usage as car body materials in Japan is reviewed first. Japanese steelmakers developed galvannealed steel, duplex Zn–Fe coated steel, Zn–Ni coated steel and organic composite coated steel. All of them have been widely used. Recently, electrolytically Fe–Zn plated galvannealed steel and 1…
Abstract Tetramethylammonium 3‐aminopropyl dimethylsilanolate, readily prepared from bis(3‐aminopropyl) tetramethyldisiloxane and tetramethyl‐ammonium hydroxide pentahydrate, has been found to serve as a highly effective catalyst for the ring opening polymerization of cyclic siloxanes with an end blocker such as bis(3…
The alkaline hydrolysis of several powdered methacryloyl polymeric prodrugs (1P-3P) prepared by mechanochemical polymerization, each of which contains acetaminophen (1), 7-theophyllineacetic acid (2) and 5-fluorouracil (3) as a pendant drug group has been examined in a heterogeneous system on its comparison with that…
In an effort to formulate the pharmacologically active ibuprofen isomer ((+)-S-ibuprofen) into a solid oral dosage form, preformulation studies were performed on both the racemate and this stereoisomer of ibuprofen. Results of the respective physical pharmacy profiles were compared to predict the pharmaceutical behavi…
Experiments performed on the end-edge contacts of polypropylene capacitors to determine whether the thermal effect is the main cause of their degradation are described. Current pulses with different wave-shapes but with the same value of the Joule integral were applied to the contacts, and the degradation levels were…
A new method has been developed for the low-temperature synthesis of perovskite solids LaMO3 where M = Ni, Co, Mn, using binuclear complexes of the ligand N,N′-bis(3-carboxysalicylidene)ethylenediamine (H4fsaen). The thermal decomposition of such complexes was studied using a thermobalance. The solids that formed afte…
Abstract Indices of relative crystallinity of starch samples after gamma irradiation in dry form or in potatoes have been determined by differential and integral methods and compared with those calculated for corresponding reference samples. In the case of dry samples, the diminution of relative crystallinity was obse…
(1991). LIQUID CRYSTAL DISPLAY APPLICATIONS: Past, Present & Future. Liquid Crystals Today: Vol. 1, No. 1, pp. 4-6.
Abstract The starch–iodine blue complex formation does not involve negatively charged iodine species like I , I , or I ; rather, neutral iodine units are involved. The heat of reaction is determined to be about −110 kJ for every mole of I‐I unit in the amylose helix, which suggests that the dissociation of I 2 (bindin…
Infrared spectra were measured of condensates generated by heating polyamide-6, polyamide-12, polyamide-11, polyamide-8 and polyamide-6,6 in inert atmosphere at 300, 350, 400, 500, and 600°C for various time. The products of thermal degradation were characterized by infrared spectroscopy. It was found that the thermal…
Fluoropolymers may be treated with sodium naphthalenide (Na/Naphth) in tetrahydrofuran (THF) so as to increase their ability to form adhesive bonds with other polymers or metals. We describe here a quantitative analysis of the chemical modification which results from such a treatment, using a range of derivatizations…
Copper–cobalt oxysalts of various Cu : Co atomic ratios (100 : 0. 92 : 8, 85 : 15, 77 : 23, 67 : 33, 15 : 85, 0 : 100) have been prepared by coprecipitation, at constant pH, from solutions of copper and cobalt nitrates added to a solution of NaHCO3; the structure and chemical nature of the Cu—Co oxysalts have been inv…
The a-c impedance measurements were made for oxide films formed in high temperature steam on Zry-2 with varying precipitate distributions. TEM and EDX analyses were also carried out on precipitates in oxide films. The electrical resistivity of oxide films tends to increase with an increase in nodular corrosion resista…
Summary The paper is divided into two parts. In Part 1, after a brief historical introduction the advantages and disadvantages of using mineral fillers in the manufacture of paper are summarised. Details of the origin, methods of production and basic physical properties of kaolin, natural calcium carbonate, precipitat…
Recent experiments support a previously proposed model of the location of carbon within the boron carbide structure as a function of carbon concentration. The main features of the model are the presence of carbon within icosahedral units over the entire single phase region, and the progressive replacement of CBC chain…
Abstract Pyrolysis gas chromatographic studies were carried out on two polyphosphate esters of bisphenol A Systematic name: 2,2′‐isopropylidendiphenol. . The gaseous pyrolysis products were found to be mainly phenols and a few phosphate compounds. The identification of phosphorus compounds in the gas phase proves a ga…
Recent studies of self-diffusion and impurity diffusion in α- and β-titanium are reviewed. The transition metal elements and phosphorus exhibit fast diffusion in α-Ti, which are three to five orders of magnitude faster than the self-diffusion. The mechanism of the fast diffusion is discussed on the basis of the severa…
Crystal structure refinement was carried out on a defect spinel with composition Mg 0.388 Al 2.408 O 4 synthesized at 2050°C Combining information from site occupancies and bond distances for tetrahedral and octahedral sites, the following cation and vacancy distribution were obtained: (Al 0.653 Mg 0.347 )(Al 1.755 Mg…