Materials Literature
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Abstract Polymerization of MMA is achieved by using a novel initiator, most probably the lanthanum enolate growing species formed in the polymeritation of ketene with La(O i Pr) 3 . The design of this simple initiator is based on the stimulation of the reactivity of La(O i Pr) 3 , which by itself is inactive, upon the…
Abstract Accelerated thermal degradation of nitrile‐butadiene rubber, ethylene‐propylene rubber, low density polyethylene and glass reinforced epoxy resin was studied (a) in air, at atmospheric pressure, and various temperatures and (b) in air or oxygen at various pressures ( P > 1 atm) and temperatures. On the bas…
Abstract Mono‐ and polyestolides, made from oleic acid, meadowfoam oil fatty acids and erucic acid, were subjected to biodegradation with mixed cultures of Penicillium verucosum, Mucor racemosus , and Enterobacter aerogenes . Fermentations were continued for 3, 5, 10, 15, 20, or 30 d. Meadowfoam oil and its fatty acid…
Abstract Composite samples consisting of ferromagnetic asymmetric particles incorporated into a polyolefin binder were injection molded using custom designed molds which produced preferential fiber orientations. The relative magnetic permeability values of the composites were measured as a function of the filler volum…
Thick‐film conductors, made from mixed and alloyed powders of Ag‐15Pd and Ag‐30Pd, have been explored in distilled water at a bias of 5 V to assess their resistance to electrolytic silver migration It was found that the resistance increases with the Pd concentration in the thick films ( i.e. , Ag < Ag‐15Pd < Ag‐30Pd)…
Fabric-evoked prickle is studied in a range of jersey knitted wool fabrics made from worsted spun yarn. The existing predictive model of relative prickliness based on earlier studies of wools with diameter characteristics is extended and can quantitatively account for changes in mean fiber length, yarn count, and fabr…
The reaction of hydrochloric acid with dry alkaline sorbents such as hydrated lime in the incineration units leads to the formation of not only calcium chloride but calcium hydroxichloride as well. A thermodynamic study of the chemical reactions involved in the dechlorination process is required in order to show if su…
Diatoms were examined from the skin of a male sperm whale (Physeter macrocephalus L.) stranded on the Belgian shore in 1994 on its return from the northern Atlantic to more southern latitudes. The morphology (LM and SEM) and taxonomy of the three ceticolous taxa present are discussed. Epiphalaina aleutica Holmes, Naga…
The thermal degradation behavior of E−CO alternating copolymers submitted to a variety of thermal conditions, both in a vacuum and in an inert atmosphere, has been investigated. The products obtained in the different thermal treatments were analyzed by GC/MS, and the structural changes occurring in the polymer chains…
The effects of oblique sputtering on microstructural modification of ZnO films were investigated. Surface morphologies of the films were profoundly modified with an incidence angle. By using pure Ar gas, etch pits, pyramids, ridge, and ledgelike structures were developed on the film surface. By using Ar/O2 mixture gas…
Paracetamol (acetaminophen, 4-hydroxyacetanilide) is a typical representative of over-the-counter analgesic and antipyretic drugs which are commonly administered as tablets. For these materials, crystallization from solution is an important stage of pharmaceutical production which defines many physicochemical properti…
Dielectric constant ε', loss tan δ and conductivity σ, of 45ZnF2–9PbO–(46 - x) TeO2-xCuO glasses (with x values ranging from 0.2 to 0.6) are studied as a function of frequency in the range 102 to 107 Hz and in the temperature range 30 to 200 °C. All these glasses are found to exhibit dipolar relaxation effects. The va…
The preparation of nanofibers —fibers with nanometer diameters—is briefly reviewed. Particular attention is paid to the synthesis based on locking‐in the mesophasic structures formed by diblock copolymers. Examples of the resulting nanofibers with a core‐shell structure (prepared for transmission electron microscopy b…
Rodlike gold(I) and gold(III) complexes [AuR(C&tbd1;N(C(6)H(4))(m)()OC(n)()H(2)(n)()(+1)-p)] (m = 1, n = 10, R = C(6)F(5); m = 2, n = 4, 6, 8, 10, 12, R = C(6)F(5), C(6)F(4)Br-o, C(6)F(4)Br-p), [(&mgr;-4,4'-C(6)F(4)C(6)F(4)){AuC&tbd1;N(C(6)H(4))(m)()OC(n)()H(2)(n)()(+1)}(2)] (m = 1, 2; n = 4, 6, 8, 10, 12), [AuRI(2)(C…
Denim fabrics of various weight ranges were sewn with three different compositions of sewing threads ‐ 100 per cent cotton, 100 per cent polyester and corespun thread ‐ with all possible ticket numbers, to examine the interaction of various fabric‐thread combinations. The sewing thread performance in terms of seam eff…
There exists a range of acoustic techniques for characterizing bubble populations within liquids. Each technique has limitations, and complete characterization of a population requires the sequential or simultaneous use of several, so that the limitations of each find compensation in the others. Here, nine techniques…
The enthalpy changes ΔH∞ between a poly(vinyl acetate) glass formed by rapid cooling and the corresponding fully relaxed glass have been estimated at four temperatures below the glass transition. The values obtained were different to those expected by extrapolating liquid behavior below the glass transition and were f…
Contact angles of water on stereoregular poly(methyl methacrylate)s (PMMA) solvent-cast in the form of films against a glass substrate were measured by using the sessile drop method. The syndiotactic films exhibited contact angle values indicative of relative dominance of the nonpolar α-methyl and methylene groups of…
The crystal structure of the maltodextrin-specific porin from Salmonella typhimurium ligated with a maltotrioside at the pore eyelet is known at 2.4 A resolution. The three glucose units assume a conformation close to the natural amylose helix. The pore eyelet fits exactly the cross-section of a maltooligosaccharide c…
A comprehensive thermodynamic model has been applied to predict the optimum conditions for the hydrothermal synthesis of phase-pure strontium zirconate. The model is based on the accurate knowledge of standard-state thermochemical properties of all species and a realistic activity coefficient model. The predictions ar…