Materials Literature
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Abstract Multiblock‐(AB) n ‐copolymers, consisting of hard segments of poly(butylene terephthalate) (PBT) and soft segments of dimerized fatty acid were synthesized and analysed with DSC and DMTA. The polymers were characterized by their limiting viscosity number and melt flow index. The glass transition temperature (…
The substituted metal alkoxides (EtO) 3 Ti(lysinate) or (BuO) 3 Ti(lysinate) are obtained when 1 equiv of lysine is added to Ti(OEt) 4 or Zr(OBu) 4 . While the α-amino carboxylate moiety chelates the titanium or zirconium atom, the terminal amino group is capable of coordinating a metal ion. According to spectroscopic…
Small solid particles when present in thin liquid films are often able to change the stability of the films and hence, for example, influence the stability of foams and emulsions in which they are present. To be effective, a particle must be capable of entering a liquid surface. After entry the behaviour of the partic…
The specific volume change of Bisphenol A polycarbonate was measured at room temperature for several years. The effects of formation conditions like cooling rate and pressure, the addition of low molecular additives, and injection molding and quenching were investigated. The volume shrinkage at long times was found to…
The following five antimony(V) tetraphenylporphyrins with sigma-bonded antimony-carbon bonds were synthesized: [(TPP)Sb(CH(3))(2)](+)PF(6)(-), [(TPP)Sb(OCH(3))(OH)](+)PF(6)(-), [(TPP)Sb(CH(3))(OH)](+)ClO(4)(-), [(TPP)Sb(CH(3))(OCH(3))](+)ClO(4)(-), and [(TPP)Sb(CH(3))(F)](+)PF(6)(-). Each compound is stable toward air…
Mechanical activation of solids leads to an increased internal energy caused by the introduction of defects. This can result for example in a reduced surface melting temperature of activated particles, which in turn may affect their sintering behavior. Analogously the spreading behavior of MoO 3 over Al 2 O 3 may depe…
The adsorption of water on the polar Cu 2 O(100) surface has been studied theoretically. Both molecular and dissociative adsorption are studied. Dissociative adsorption is found to be energetically favorable, and good qualitative agreement is achieved between experimental and simulated UPS spectra for low coverages. T…
ADVERTISEMENT RETURN TO ISSUEPREVCorrectionSynthesis of Nanosize Latexes by Reverse Micelle PolymerizationA. Hammouda, Th. Gulik, and M. P. PileniCite this: Langmuir 1996, 12, 4, 1108Publication Date (Web):February 21, 1996Publication History Published online21 February 1996Published inissue 1 January 1996https://pubs…
Lanthanides are known to be effective inhibitors of the PMCa(2+)-ATPase. The effects of LaCl3 on the partial reactions that take place during ATP hydrolysis by the calcium-dependent ATPase from plasma membrane (PMCa(2+)-ATPase) were studied at 37 degrees C on fragmented intact membranes from pig red cells by means of…
The aim of this work is to study the influence of moisture on the surface chemistry and texture of C and E glass fibers. Thermal analysis (in the conditions of controlled rate transformation analysis) coupled with mass spectroscopy, surface area determination (by krypton adsorption at 77 K), adsorption of water by gra…
Preface. Acknowledgement. Introduction. Elements of deformable body analysis. Macroscopic and microscopic features of fatigue. Engineering characterizations of safe life. Fatigue crack growth. Structural integrity of metals. Structural Integrity of polymeric matrix composite laminates. Biomaterials. Appendices. Proble…
Abstract
The cationic ring-opening polymerization of octamethylcyclotetrasiloxane initiated by R 3 SiH−Ph 3 C + B(C 6 F 5 ) 4 - (trityl TPFPB) in the absence of protic acids has been investigated. Mechanistic studies demonstrate that the polymerization proceeds by a single “long-lived” oxonium ion end. This novel polymerizatio…
Streptomyces subtilisin inhibitor (SSI) contains three methionine residues in a subunit: two (at positions 73 and 70) in the crucial enzyme-recognition sites P1 and P4, respectively, and one (Met 103) in the hydrophobic core. The motions of the side chains of these three Met residues and the changes in mobility on bin…
Various magnesium oxide catalysts have been prepared by thermal treatment of two different precursors: Mg(OH)2 and Mg5(OH)2(CO3)4. An additional system based on MgO and doped with B2O3 was also prepared. The textural and acid–base properties of the catalysts were investigated. The synthesized solids were characterized…
Cut-off frequencies of all TE and TM modes of a ridged rectangular waveguide are accurately determined using a coupled-integral equations technique (CIET). The technique analyzes both symmetric and asymmetric situations in one step. Basis functions, which include the edge conditions and mirror images in the waveguide…
Several computational aspects of the fracture energy based softening plasticity model for plain concrete are considered. A need for a more robust stress return strategy is identified, as the basic closest point projection algorithm leads to regions of nonconvergence, associated with zones of high curvature near the co…
Recent literature has drawn a distinction between charging across the surface (lateral differential charging) and charging with depth (vertical differential charging) for insulating samples. In this study, differential charging in a bulk insulator was investigated using imaging and small-area spectra acquired with a m…
The effects of Tween 20 on the desorption of proteins from polyethylene and polyurethane were studied, using single protein solutions of the human proteins fibrinogen (Fb), immunoglobulin G (IgG), serum albumin (HSA), high density lipoproteins (HDL), and plasma. The surfactant may partly or even completely desorb the…
The incorporation of titanium oxide into the interlayers of a myristic acid exchanged lithium aluminum layered double hydroxide was done by partitioning of titanium butoxide into the interlayer, followed by hydrolysis under ambient conditions. Upon excitation with near-ultraviolet radiation in the presence of viologen…