Materials Literature
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A triblock copolymer template and an organosiloxane or organic additive facilitated the first synthesis of large-pore (up to 9.5 nm) three-dimensional bicontinuous mesoporous silica with Ia3d-type symmetry at room temperature in acidic medium. The picture is a transmission electron micrograph showing the pores along […
High resolution neutron powder diffraction and single crystal measurements on the ferromagnetic shape memory compound Ni 2 MnGa have been carried out. They enabled the sequence of transformations which take place when the unstressed, stoichiometric compound is cooled from 400 to 20 K to be established. For the first t…
Silaffins are uniquely modified peptides that have been implicated in the biogenesis of diatom biosilica. A method that avoids the harsh anhydrous hydrogen fluoride treatment commonly used to dissolve biosilica allows the extraction of silaffins in their native state. The native silaffins carry further posttranslation…
In this work, benzoyl peroxide is used as an oxidizing agent to oxidize aniline to polyaniline salt in the presence of protic acids such as sulfuric or nitric acid. The polymer samples are characterized by infrared, X-ray diffraction, particle size, resistance and density measurements. Polyaniline salts are used as ca…
Abstract The glass transition temperature ( T g ), crystallization, and melting character of a class of random polyester ionomers (polymer containing < 10 mol % ionic groups) were investigated. The nonlinear change of the T g and crystallization and melting behavior were characterized using differential scanning co…
Reciprocal lattice mapping has been performed on Fe0.81Ga0.19 crystals by ω–ω/2θ, Ψ–φ, and ω–φ scans. A strong elongation of the 〈001〉c peak was found along the 〈110〉c direction. ω scans revealed short lateral correlation lengths ξ along 〈110〉c and strong diffuse scattering along the 〈001〉c. Multiple domains with mono…
Abstract The effects of the block length and block number of linear styrene–butadiene (S–B) block copolymers on their compatibilization efficiency in blending polystyrene with polybutadiene were studied. For this purpose, two sets of model S–B copolymers and both homopolymers were prepared by anionic polymerization. D…
Cationic copolymerization of a functional aldehyde, methyl glyoxylate (GM), with a seven-membered cyclic acetal, 1,3-dioxepane (DXP), leads to polyacetals containing ester side groups that may be used for functionalization. Partial replacement of the ester groups in GM−DXP copolymers with amide groups by reaction with…
The solvoconductive properties of low-defect anodically coupled polypyrroles and polythiophenes, made so they are able to be solvated by organic vapors with suitable substituents, have been studied. The investigation was performed by contemporary conductivity and electrochemical quartz crystal microbalance analysis of…
Abstract Two new pyromellitic dianhydrides, 1,4‐bis(4′‐ t ‐butylphenyl) pyromellitic dianhydride and 1,4‐bis(4′‐trimethylsilylphenyl) pyromellitic dianhydride, were synthesized via Suzuki coupling, oxidation, and dehydration. A series of new organosoluble polyimides were prepared from the obtained pyromellitic dianhyd…
This study identifies surface chemistry characteristics based on competitive behavior in the simultaneous adsorption behavior of NOx (NO rich) and SO2 using KOH impregnated activated carbon (K-IAC) in excess O2. The NOx and SO2 adsorption on K-IAC occurred mainly through the acid-base reaction. The high surface area w…
The functionalization of different types of porous polystyrene microspheres using allylamine plasmas has been explored using a combination of Fmoc derivatization chemistry and cross-sectional Raman microscopy. Higher amine group loadings are obtained for small particles with large internal pore diameters.
Abstract Kinetic evidence in thermomechanical analysis experiments and carbon‐13 nuclear magnetic resonance spectroscopy ( 13 C NMR) evidence indicates that the strength of a joint bonded with UF (urea–formaldehyde)/polymeric 4,4'‐diphenylmethane diisocyanate (pMDI) glue mixes is improved by coreaction of the methylol…
Diamond films grown on silicon were polished to a root-mean-square roughness of 15 nm and bonded to (100) silicon in a dedicated ultrahigh vacuum bonding chamber. Successful bonding was observed at temperatures as low as 950 °C under a uniaxial mechanical stress of 32 MPa. Scanning acoustic microscopy indicated comple…
We have isolated the 1:1 Ln:[alpha-2-P2W17O61]10- complexes for a series of lanthanides. The single-crystal X-ray structure of the Eu3+ analogue reveals two identical [Eu(H2O)3(alpha-2-P2W17O61)]7- moieties connected through two Eu-O-W bonds, one from each polyoxometalate unit. An inversion center relates the two poly…
Abstract Three series of core‐shell hydroxyl‐functionalized latexes were synthesized and then crosslinked with a cycloaliphatic diepoxide. The same amount of hydroxyl functional monomer was added during the core stage, shell stage, or partitioned equally between the core and the shell. The morphology of the latexes wa…
A new vitreous phase with Na3Al2(PO4)3 composition has been prepared. Its crystallisation has been optimised by annealing at low temperature, giving crystalline c-Na3Al2(PO4)3 with Sc2(WO4)3-type structure. The direct synthesis of vitreous Li3Al2(PO4)3 has been attempted but it was unsuccessful. Ion exchange reaction…
Abstract The effect of the uniaxial and biaxial stretching and subsequent solution annealing of extrusion‐cast polyamide‐11 films on the crystalline structure and morphology was investigated with differential scanning calorimetry, wide‐angle X‐ray diffraction (WAXD), Fourier transform infrared spectroscopy, and small‐…
Effective medium theory (EMT) is a semiempirical approach developed to predict the response properties of composites. In particular, EMT has been applied to the study of rough metal surfaces that can enhance the absorption of electromagnetic radiation in the infrared [surface-enhanced infrared absorption (SEIRA) or in…
As models for substances adsorbed within amorphous solid matrices, we consider mixtures of spheres with either hard or ideal interactions where several (matrix) components are quenched and the remaining (adsorbate) components are equilibrated. We propose a density-functional theory, based on the exact zero-dimensional…