Materials Literature
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The tetratricopeptide repeat (TPR) motif is a protein-protein interaction module found in multiple copies in a number of functionally different proteins that facilitates specific interactions with a partner protein(s). Three-dimensional structural data have shown that a TPR motif contains two antiparallel alpha-helice…
It is demonstrated that the catalyst system bis(pentamethylcyclopentadienyl)-zirconium dichloride (Me5Cp)2ZrCl2–methylaluminoxane (MAO) is able to produce random copolymers of ethene and 1-hexene. The 1-hexene incorporation in the copolymers is extremely small. Even in the case of a molar ratio of [ethene] to [1-hexen…
A new type of epoxy resin, which contained phosphorus oxide and nitrogen groups in the main chain, was synthesized. The structure of the new type of epoxy resin was confirmed by infrared (IR) spectroscopy, 1H nuclear magnetic resonance (1H-NMR), and 13C-NMR spectroscopic techniques. In addition, compositions of the ne…
Grafting of maleic anhydride onto polypropylene was performed in a Haake torque rheometer, according to a central composite experimental design, in which four factors were varied: the maleic anhydride and peroxide concentrations, rotor speed, and reaction time. The current article investigates the effect of rotor spee…
After investigating kinetics of the UV photodegradation of PET film samples having a thickness of 4.4 µm, we found that the photodegradation process takes place in two steps: a very rapid initial step followed by a normal step. This phenomenon is explained by using a concept of “weak links.” We have obtained the rate…
Grafting reactions were performed in a Haake torque rheometer, according to a central composite experimental design, where the maleic anhydride and peroxide concentrations, rotor speed, and reaction time were varied. The 27 formulations were analyzed by Fourier transformed infrared spectroscopy and melt-flow index mea…
This paper concerns a relaxation of the assumption of uniform mixture composition in the interior of sonoluminescence bubbles. Intense temperature and pressure gradients within the bubble drive relative mass diffusion which overwhelms diffusion driven by concentration gradients. This thermal and pressure diffusion res…
Results of Monsanto rheometic studies and measurements of physical properties reveal that precipitated silica interacts chemically with epoxidized natural rubber (ENR) during high temperature (180°C) molding and the extent of chemical interaction increases in the presence of silane coupling agent, namely N-3(N-vinyl b…
Interpenetrating polymer networks (IPNs) were prepared from polyurethane (PU)-modified epoxy with different molecular weight of polyol and polyurethanes based on the mixture of polydiol and polytriol by a one-shot method. Two types of PU-modified epoxy: PU-crosslinked epoxy and PU-dangled epoxy were synthesized, and t…
Density functional theory (DFT) and multiconfiguration self-consistent field (MCSCF) calculations on the oxo FeO(4)(2)(-) (Fe(VI)) and the hypothetical oxo FeO(4)(-) (Fe(VII)), and FeO(4) (Fe(VIII)) and peroxo FeO(2)(O-O)(z)() [z = -2 (Fe(IV)), z = -1 (Fe(V)), z = 0 (Fe(VI))], Fe(O-O)(2)(z)() [z = -2 (Fe(II)), z = -1…
Anodic coupling of 5,5‘-bis(3,4-(ethylenedioxy)thien-2-yl)-2,2‘-bipyridine has produced a new ion-coordinating polyconjugated polymer as thin films on electrodes. The polymer has been characterized by cyclic voltammetry, FTIR reflection−absorption, UV−vis spectroscopy, electrochemical quartz crystal microbalance, in s…
γ-Li x V 2 O 5 ( x = 0.9−1) was synthesized at 350 °C. The material was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The synthesis reactions were studied by thermogravimetric analysis (TGA). The composition of γ-Li x V 2 O 5 was determined by atomic absorption spectroph…
Water vapor adsorption/desorption isotherms at 298 K and XRD measurements and nitrogen isotherms at 77 K before and after exposure to water vapor were determined on pure silica MCM-41 samples; samples had different pore widths and were prepared by different synthesis methods, including hydrothermal and room-temperatur…
Impregnation of hyper-cross-linked polystyrene (HPS) by either Co 2 (CO) 8 in 2-propanol or the [Co(DMF) 6 ] 2+ [Co(CO) 4 ] - 2 complex in dimethylformamide (DMF), followed by thermolysis at 200 °C, results in the formation of discrete Co nanoparticles. The concentration and characteristics of such nanoparticles were…
An effective photochemical route is reported here for size-controlled synthesis of nonaqueous colloidal gold particles in a highly polar and viscous medium, formamide in the presence of poly(vinylpyrrolidone). The effective photoreduction of AuCl 4 - in the nonaqueous system is attributed to the higher degree of disso…
The new biodegradable starch graft copolymer, starch- g -polycaprolactone (PCL), was synthesized by using the ring-opening graft polymerization of a ε-caprolactone (CL) monomer onto starch backbone. The grafting reactions were conducted with various starch/CL/water feed ratios to obtain starch- g -PCL copolymers with…
Steady-state luminescence spectroscopy and luminescence decay analysis have been employed to study the association of two rare earth ions (i.e., Eu 3+ and Tb 3+ ) with poly(ethylene glycol) in the absence and in the presence of 2,2‘-bipyridine, which acted as an antenna of near-UV radiation. Three different systems ha…
We previously demonstrated that metal nanoclusters ranging in size from 1 to 2 nm can be prepared within dendrimer templates. In this two-step synthesis, metal ions (for example, Cu 2+, Pd 2+, and Pt 2+ ) first partition into the interior of, for example, a hydroxyl-terminated poly(amidoamine) (PAMAM) dendrimer, and t…
Nanocomposite materials were prepared from an elastomeric medium-chain-length poly(hydroxyalkanoate) (Mcl-PHA) latex as semicrystalline matrix using a colloidal suspension of hydrolyzed cellulose whiskers as natural and biodegradable filler. After stirring, the preparations were cast and evaporated. High-performance m…
Mesoporous materials have been synthesized that are composed of hybrid frameworks in which inorganic and organic components have a fixed stoichiometry and are covalently bonded. The creation of UOFMN (unified organically functionalized mesoporous networks) materials incorporates concepts employed in the synthesis of M…