Materials Literature
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The intercelluar diffusion of poly(butyl methacrylate) (PBMA; glass transition temperature ( T g ) = 21 °C) at 60 °C was monitored by fluorescence energy transfer in films formed from blends of PBMA latex and a high- T g (hard) latex. Two types of hard latexes were used in blends: one composed of poly(methyl methacryl…
A modified mathematical model based on the melting and recrystallization of an initial distribution of melting temperatures satisfactorily predicts the melting behavior of PET in differential scanning calorimetry. The simulated DSC curves produced in this work agreed fairly well not only with experimental DSC curves p…
Scanning transmission X-ray microscopy (STXM), atomic force microscopy (AFM), and dynamic secondary ion mass spectrometry (DSIMS) were used to obtain the true three-dimensional concentration profiles of polystyrene (PS) and bromo−polystyrene (PBr x = 0 .79 S where x = fraction of monomers brominated) blend films as a…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAdsorption of Benzene and Ethanol on MCM-41 MaterialC. Nguyen, C. G. Sonwane, S. K. Bhatia, and D. D DoView Author Information Chemical Engineering Department University of Queensland, Brisbane, QLD 4072, Australia Cite this: Langmuir 1998, 14, 17, 4950–4952Publication Date (We…
The accelerated degradation of aqueous polyacrylamide at low temperature was studied. The selected degradation agents included several peroxides, such as potassium persulfate (K2S2O8), ammonium persulfate ((NH4)2S2O8), hydrogen peroxide (H2O2), and the potassium persulfate–sodium thiosulfate (K2S2O8–Na2S2O3) redox sys…
A systematic electrical and mechanical study was carried out on styrene butadiene rubber (SBR), as a nonpolar rubber, and nitrile rubber (NBR), as a polar one blended with pure and waste polyethylene (PE), low and high density. The compatibility investigations, which were carried out by the dielectric method and confi…
Fluorescence optical microscopy (FOM) of poly(vinyl alcohol) (PVA) and poly(vinyl acetate) (PVAc) blends in compositions 9/1, 1/1, and 1/9 (w/w) show that these blends present phase separation in the solid state. Each domain of the solid samples was identified by FOM as PVA-richer domains by green fluorescence of fluo…
The adsorption equilibria for benzene and toluene vapors on commercially available activated carbon fiber were measured by a static volumetric technique. The equilibrium measurements were made at 298.15, 323.15, and 348.15 K and pressures up to 8.7 kPa for benzene and 3.4 kPa for toluene, respectively. The results wer…
A negative-working photoresist based on calix[4]resorcinarene (C-4-RA), 4,4‘-methylenebis[2,6-bis(hydroxymethyl)phenol] (MBHP) as a cross-linker, and a photoacid generator diphenyliodonium 9,10-dimethoxyanthracene-2-sulfonate (DIAS) has been developed. A clear transparent film was obtained from a 25 wt % C-4-RA soluti…
We present results of ab initio band structure calculations on some ABO 2 delafossite oxides that have both the A and B sites occupied by transition metals. This class of materials includes insulators as well as some of the most conducting oxides. The calculations have been performed in order to understand the nature…
A characterization has been carried out on the dihydrate and anhydrous crystalline form of trehalose (α- d -Glucopyranosyl-α- d -glucopyranoside), which is considered anomalous in respect to other disaccharides in conferring to organisms the ability to be dried at high temperatures and then to rehydrate without damagi…
Poly(diallyldimethylammonium) chloride ( P ) and sodium decatungstate ( W ) were layer-by-layer self-assembled onto quartz, mica, and ITO-electrode substrates (S). The self-assembled films, S-( P / W ) n, were characterized by absorption spectrophotometry, reflectivity, cyclic voltammetry and scanning force microscopy…
Three pentaatomic molecules CSi 2 Al 2, CSi 2 Ga 2, and CGe 2 Al 2 were studied at the B3LYP/6-311+G* and MP2/6-311+G* levels of theory (with tests also run at multiconfigurational levels) to determine whether the central carbon atom exists in a planar geometry. We found that cis -CSi 2 Al 2 and trans -CSi 2 Al 2 plan…
50/50 wt % blends of isotactic polypropene (i-PP) with metallocene-based random poly(ethene- co -1-butene) (PEB) were prepared with 1-butene content varied from 52 to 100 wt %. The melt miscibility of the i-PP/PEB blends as a function of 1-butene content was studied by investigating the morphologies of the blends in t…
The microstructure of cold-crystallized poly(ether−ether−ketone)/poly(ether−imide) (PEEK/PEI) blends has been investigated by a combination of wide- and small- angle X-ray scattering (SAXS), dielectric spectroscopy, and transmission electron microscopy. Both SAXS and dielectric spectroscopy indicate that most PEI is e…
Two new compounds containing tellurite building blocks coordinated to copper and barium atoms have been isolated from hydrothermal solvents. A new layered compound, Ba(2)Cu(4)Te(4)O(11)Cl(4) (I), has been obtained by reacting BaCl(2).2H(2)O, CuO, and Te(OH)(6) in NH(4)Cl solution at 375 degrees C for 4 days. Green, pl…
The tilings of rhombi in two dimensions and of rhomboedra in three dimensions are studied when they are constrained by fixed boundary conditions. We establish a link between those conditions and free or periodic boundary ones: the entropy is written as a functional integral which is treated via a saddle-point method.…
Digital x-ray imaging techniques of today require electronic detectors that can be applied to all modalities of medical imaging. This paper presents work showing that selenium, when used as a direct converter, can be competitive with present day scintillator technologies targeting mammographic, radiographic and fluoro…
The evolution of cross-linked polymer chain clusters in a solvent from a monomer solution has been investigated by dynamic light scattering. The characteristic decay time distribution, P (Γ -1 ), of the gelling system has been examined as a function of the initial monomer concentration, C, where Γ -1 and Γ are the cha…
The templating organoammonium cations of as-synthesized MCM-41 mesoporous silicas are ion-exchanged with [Co(en)3]3+or trans-[Co(en)2Cl2]+ in DMSO or ethanol neutral solutions, respectively. Pure electrostatic adsorption or complex grafting takes place at the inner MCM-41 surface depending on the nature of the complex…