Materials Literature
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It is difficult to go through a whole day without coming in contact with something which does not contain a foamed plastic part somewhere within. The most common examples perhaps are the foamed polyurethane seat cushion of the sofa or chair or the car-seat that you sat on this morning, or the polystyrene foam cup in w…
Abstract Commercial FeCl 2 and Fe(II) glycolate, Fe(II) L ‐lactate or Fe(II) L ‐mandelate were used as initiators for the polymerization of L ‐lactide. All polymerizations were conducted in bulk at 150°C, because no conversion was observed in bulk at 120°C. The Fe(II) lactate was found to be more reactive than FeCl 2…
Conducting polymer composites of polyethylene and polypyrrole (PE/PPy), polypropylene and polypyrrole (PP/PPy) and poly(methyl methacrylate) and polypyrrole (PPMA/PPy) were prepared by means of a chemical modification method resulting in a network-like structure of polypyrrole embedded in the insulating polymer matrix…
Anisotropic line broadening in cell-constrained whole-powder-pattern fitting (including the Rietveld method) is proposed to be modelled qualitatively. The object is primarily to improve the fit, with the expectation of an increase in the feasibility of an ab initio structure determination in difficult cases. In a firs…
The heterocyclic anils 2-salicylideneaminobenzothiazole (SABT), 2-salicylideneamino-6-chlorobenzothiazole (SACLBT), and 2-salicylideneamino-6-methoxybenzothiazole (SAMEOBT) were investigated to evaluate their efficiency as corrosion inhibitors for mild steel (MS) in 1 M hydrochloric acid (HCl) at concentrations from 1…
Phase diagrams of thermoreversible gels are derived by the use of two different conventional postgel treatments, i.e., Flory's treatment and Stockmayer's treatment. Phase diagrams by Flory's treatment, which allows cycle formation in the gel network, often show two critical points for intermediate association constant…
In compressed GIS (gas insulated switchgear), the control of wire particle contamination by dielectric coating of enclosure is demonstrated in this paper. Assuming that a particle acquires free charge through a partial discharge, the modeling of particle movement when the inside surface of a horizontal section of GIS/…
Abstract This is a review of PVC technology from chlorine and ethyle, to PVC polymerization, to melt processing, to properties, to recycling and environmental concerns. It is written in terms for understanding by even non‐scientists in the industry. PVC has a large sales volume, second only to polyethylene. Its high c…
The reaction of the divalent metal halides ZnCl(2), ZnBr(2), MnCl(2).4CH(3)CN, MnBr(2), FeCl(2).4CH(3)CN, CoCl(2).4CH(3)CN, CoBr(2), NiCl(2).6H(2)O, and NiBr(2), respectively, with the macrocycle 1,4,7-trimethyl-1,4,7-triazacyclononane (L) (1:1) in anhydrous acetonitrile, acetone, chloroform, or ethanol affords upon a…
The most commonly used solder for electrical interconnects in electronic packages is the near eutectic 60Sn‐40Pb alloy. This alloy has a number of processing advantages(suitable melting point of 183°C and good wetting behaviour). However, under conditions of cyclic strain and temperature (thermomechanical fatigue) the…
Two new cardenolides, 3 beta-O-(D-2-O-methyldigitalosyl)-14 beta-hydroxy-5 beta-carda-16,20(22)-dienolide (1) and 3 beta-hydroxy-8,14-epoxy-5 beta-carda-16,20(22)-dienolide (2), and two known cardenolides, 3 beta-O-(D-digitalosyl)-14 beta-hydroxy-16 beta-acetoxy-5 beta-card-20(22)-enolide (3) and 3 beta-O-(D-digitalos…
Integral experiments with 2-m-long pressurized water reactor and boiling water reactor fuel rod bundle simulators containing a maximum of 57 rods (the CORA experimental program) as well as comprehensive single-effects investigations are examined. The physico-chemical material behavior of light water reactor fuel eleme…
Computational simulations of layered double hydroxides (LDHs) , based on relatively simple models and simulation procedures (classically based force‐field calculations), are shown to be an effective technique for rationalizing the orientation fo guest species. It is demonstrated that the simulations yield valeus for t…
Mullite transformation kinetics of sol‐gel‐derived diphasic mullite gels doped with P 2 O 5 , TiO 2 , and B 2 O 3 were studied using quantitative X‐ray diffraction and differential thermal analysis (DTA). The mullite transformation temperature initially increased with P 2 O 5 doping because of phase separation and for…
Abstract Strong multiple complexation of transition metal ions, Cu(II), Zn(II) and Ni(II) with different generations of well‐defined poly(propylene imine) dendrimers as multi(tridentate) ligands has been used to construct nanoscopic assemblies of defined structure and size incorporating a distinct number of metal ions…
This paper reports on the synthesis and morphological characterization of graft block copolymers in which a single polystyrene (PS) arm was grafted at an asymmetric position along a polyisoprene (PI) backbone. These materials represent a model series of asymmetric simple graft (ASG) block copolymer structures. The syn…
Internal strains in cluster-compacted nanocrystalline Pd (crystallite size 10–20 nm) were studied by means of wide-angle x-ray scattering. The strain- and size-induced broadening of the Bragg diffraction peaks was determined by Hall or Warren–Averbach analyses. The Warren–Averbach analysis indicates a spatial confinem…
Solutions of bis(cyclooctadiene)nickel react in the presence of polyvinylpyrrolidone in dichloromethane to give stable colloidal suspensions of nickel with a mean particle size of 20 Å (10 wt % Ni/PVP) and 30 Å (15 wt % Ni/PVP). The PVP-stabilized metal particles in organic suspension adsorb CO in both bridged and lin…
A series of SrTiO/sub 3/ (STO) films have been grown at a wide range of deposition conditions in order to determine the optimal growth parameters to maximize ferroelectric tuning while maintaining the lowest dielectric losses. The deposition pressure of the ambient O/sub 2/ (40 mTorra(bulk) at higher pressures (P(dep)…
Limestone or calcium carbonate (CaCO 3 ) used as a sorbent in the removal of acid gas precursors (SO 2 ) from combustion systems suffers from poor pore structural properties which causes low reactivity and incomplete utilization. The surface area and pore size distribution of CaCO 3, if tailored appropriately, can con…