Materials Literature
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Resistance to antibiotics is increased in all hospitals, and bacterial pathogens that contaminate burns and wounds are widespread. Their resistance to well-known antibiotics is recorded, and every day resistant isolates are counted and studied. The present study aimed to prepare new polymers with antimicrobial activit…
Binary blends of the sulfonated poly(ether ether ketone) (SPEEK)–poly(ether imide) (PEI) and SPEEK–polycarbonate (PC), and ternary blends of the SPEEK–PEI–PC, were investigated by differential scanning calorimetry. SPEEK was obtained by sulfonation of poly(ether ether ketone) using 95% sulfuric acid. From the thermal…
The dynamic mechanical properties of poly(n-butyl methacrylate) (PBMA) latex films postadded with alkali-soluble resin (ASR) have been studied and compared with those of latex films prepared by emulsion polymerization in the presence of ASR (ASR-fortified latex). The miscibility between PBMA and ASR, poly(styrene/alph…
Polycarbonate (PC) blended with a polymer-modifier polycarbonate–polydimethylsiloxane (PC–PDMS) of polyblock structure having equal molar ratios of soft (PDMS) and hard (PC) blocks have been investigated. The kinetics of adhesional interaction in blends and the analysis of interphase interaction conducted by using the…
The effectiveness of a set of thermally resistant polymers was evaluated for aircraft applications using the cone calorimeter (ASTM E1354/ISO 5660) under heat fluxes simulating real scale fires. This study included eight developmental and commercial thermally resistant polymers available in the literature and/or marke…
Styrene–butadiene rubber (SBR) was treated with decabromobiphenyl oxide (DBBO) and/or aluminum hydroxide [Al(OH)3] as a flame retardant. The flammability of the resulting system was determined by the limiting oxygen index method. The effect of the added flame retardants on the maximum torque (MH), curing rate, and ten…
Selected examples of the Canadian contribution to the development of understanding of the behavior of hydrogen in zirconium alloys are reviewed. To solve the technical problems faced by the nuclear industry, it was necessary to have values for the solubility and diffusivity of hydrogen in the alloys, the diffusivity n…
A number of structurally different block copolymer polyhydroxypolyamides (PHPAs), produced by condensation polymerization of activated aldarates with 1o diamines, were evaluated for their water and methanol solubility and film-forming and adhesive properties. The polymers are composed of a single aldaric acid and a si…
The maleate cis-trans isomerase gene (maiA) from Serratia marcescens IFO3736 was cloned and sequenced. Serratia MaiA has 62.4% amino acid identity with Alcaligenes faecalis IFO13111 MaiA and 64.9% with Bacillus stearothermophilus MI-102 MaiA. All known ten amino acid sequences of MaiA had significant conserved regions…
Abstract Of the principal classes of engineering materials, ceramics are in many ways the most interesting and challenging. Many properties, or combination, of properties, not achievable with other classes of materials give ceramics enormous technical potential. The main obstacles that prevent the wider use of ceramic…
Nanometre-sized poly(vinylidene fluoride) (PVDF) particle domains in a confined space were obtained by blending PVDF with excess poly(methyl methacrylate) (PMMA). When these particles were small enough they showed β-form structure, which was different from the structure of bigger particles or PVDF bulk. However, the β…
Liposomes or lipid nanoparticles are amphiphilic vesicles that allow the inclusion of substances of interest of any kind, both lipophilic and hydrophilic. This has put these transport systems in the spotlight for some time because it has been shown that they can function as carriers to release controlled and targeted…
The changes in pressure-composition isotherms, structural and magnetic properties upon cyclic hydrogen absorption-desorption have been investigated for LaNi5 and LaNi4.7Al0.3 in order to identify the origin of their performance degradation. The hydrogen storage capacity of LaNi5 was observed to degrade by 35% after cy…
(2000). Welding of stainless steels. Duplex and superduplex steels. Welding International: Vol. 14, No. 1, pp. 5-11.
X-ray photoelectron (XPS) and X-ray Auger electron spectroscopy (XAES) were used for investigating the chemical and structural states of various aluminates. A clear chemical shift in Al modified Auger parameter (AP) for coordination state of Al atom was observed. For similar chemical composition, the AP of tetrahedral…
Flexible polyurethane foam based on toluene diisocyanate and polyester polyol has been liquefied by treatment with either dimethyl phosphonate (CH3O)2P(O)H or diethyl phosphonate (C2H5O)2P(O)H at 160°C. The product degraded has been studies by 1H, 13C, and 31P nuclear magnetic resonance (NMR) spectroscopy. The likely…
Electrospray ionization mass spectrometry was used to investigate the binding of selected carbohydrates to different multimeric forms of apo-concanavalin A (apo-Con A). Information on the stoichiometry of the different quaternary Con A complexes, bound to high-affinity carbohydrate ligands, could be derived from the m…
The metallation of [p-Butcalix[4](ONa)2(OMe)2] 1 was performed using [CrCl3(THF)3] and the resulting complex [Cr{p-Butcalix[4](O)2(OMe)2}(Cl)(THF)] 2 allowed entry into low valent and organometallic chemistry of chromium. In the presence of strong bases or nucleophiles the ligand underwent demethylation exemplified by…
The Young’s modulus, shear modulus and Vickers hardness of alkali oxide-, alkaline earth oxide- and rare earth oxide-aluminosilicate glasses were measured. For the direct calculation of these properties from the glass composition, semi-empirical equations expressed in terms of the product of the apparent Madelung cons…
Abstract The acoustic resonance of the air cavity in the tire/wheel assembly may be a contributor to vehicle interior noise through the structure‐borne noise transmission path. This problem has been examined in the past using approximate closed form solutions (based on plane wave theory for a two‐tube model) and numer…