Materials Literature
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Organically modified magadiite has been prepared by grafting γ-methacryloxypropylsilyl (γ-MPS) groups to the interlayer surface. γ-Methacryloxypropyltrimethoxysilane as silylating reagent was reacted with dodecyltrimethylammonium-exchanged magadiite. Formation of the organic derivatives of magadiite was confirmed by X…
Coir fiber native to the Brazilian northeast coast has been characterized by mechanical, thermal, and microscopy techniques. The tensile strength, initial modulus, and elongation at break were evaluated for untreated and alkaline-treated fibers. The results showed an enhancement of mechanical properties after 48-h soa…
This work describes the detailed structural investigation of mesophase-templated mesoporous silica films by 1D and 2D X-ray scattering techniques and transmission electron microscopy. The films are prepared by sol−gel dip coating with 2D hexagonal templating mesophases, yielding 2D mesoporous structures consisting of…
The present review outlines, on the basis of specific examples taken from our laboratory, the most important steps in (i) preparing supported nanoassembled model catalysts and (ii) investigating their size-dependent catalytic properties. We describe the cluster generation and present evidence for softlanding of the cl…
The blending of thermoplastic starch (TPS) with other biodegradable polyesters such as polyesteramide could be an interesting way to produce new biodegradable starch-based materials. Different mixes of wheat starch and polyesteramide (BAK) were melt blended by extrusion. After pelletization, granules were injection mo…
Starting from the basic Landau model for the incommensurate-commensurate materials of the class II, we derive the spectrum of collective modes for all (meta)stable states from the corresponding phase diagram. It is shown that all incommensurate states posses Goldstone modes with acoustic dispersions. The representatio…
The effect of fiber surface pretreatment on the interfacial strength and mechanical properties of wood fiber/polypropylene (WF/PP) composites are investigated. The results demonstrate that fiber surface conditions significantly influence the fiber–matrix interfacial bond, which, in turn, determines the mechanical prop…
The real-time real-space higher-order finite-difference method is applied to the calculation of dielectric functions of diamond crystallites. The calculation is performed for cubic grains of various sizes, the largest of which is of 4-nm linear dimension and contains 13 460 carbon atoms. The surface dangling bonds are…
Molecular composites were prepared by the solution blending of poly(ethylene oxide) (PEO) of three different molecular weights with low concentrations of poly(p-phenylene terephthalamide) (PPTA) anion serving as a rigid-rod reinforcement. For all of the composites, the tensile strength, stiffness, and fracture energy…
The water-soluble complex of polyethylene oxide (PEO) with poly (vinyl phenol-co-potassium styrene sulfonate) (PVPh-co-KSS) was studied by liquid-state NMR. PEO showed two peaks in the 1H spectra, which corresponded to the free and complexed PEO. The ratio of the free PEO/complexed PEO was decreased with the increase…
The radical polymerization of 5-methylene-2,2-dimethyl-1,3-dioxolan-4-one (2) was carried out, and the structure of the obtained polymer was studied and determined by NMR, IR, and ultraviolet–visible spectroscopy. It was confirmed that the polymer did not consist of a ring-opened unit but rather consisted of a vinyl p…
Laser-selective excitation and fluorescence and Zeeman infrared-absorption spectroscopy have been employed to study ${\mathrm{Sm}}^{3+}$ centers in doped ${\mathrm{CaF}}_{2}$ and ${\mathrm{SrF}}_{2}$ crystals. The dominant center present in both host crystals has been determined to consist of a ${C}_{4v}$ symmetry ${\…
The reaction of hexacyanobutadiene (HCBD) and meso-tetrakis(4-chlorophenyl)porphinatomanganese(II) pyridine [MnIITClPPpy] (1Cl) leads to two phases of [MnIIITClPPpy][HCBD].PhMe (alpha-2Clpy, beta-2Clpy). Similarly, the reaction of HCBD and tetrakis(4-bromophenyl)porphinatomanganese(II) pyridine [MnIITBrPPpy] (1Br) lea…
Tri-O-allylcellulose (degree of polymerization, DP ∼112) was prepared in ∼91% yield, and tri-O-crotylcellulose (DP ∼138) was prepared in ∼56% yield from microcrystalline cellulose (DP ∼172, and polydispersity index, PDI ∼1.95) using modified literature methods. Number-average molecular weight (Mn = 31,600), weight-ave…
In the present study, we show that the stoichiometry of sputtered molybdenum oxide films can be changed from oxygen deficient to, more surprisingly, oxygen rich. O/Mo ratios as high as 3.2 were measured, depending on the oxygen partial pressure in the sputtering atmosphere. It is shown that a substantial part of the e…
Eine bemerkenswert intensive Bande im Nah-IR-Spektrum weist 1 aufgrund seiner chinoiden Struktur auf (λmax=1080 nm); das kürzere Dimer 2 (λmax=780 nm) ist weniger stark konjugiert, da sterische Wechselwirkungen eine verdrehte Struktur erzwingen. Das aus 62 Atomen bestehende Chromophor von 1 ist im Kristall deutlich ge…
Diamond-like carbon (DLC) films have been prepared by pulsed laser deposition (PLD) (wavelength 248 nm), ablating highly oriented pyrolytic graphite (HOPG) at room temperature in a vacuum of 10 −2 Pa, at fluences between 0.5 and 35 J cm −2 . Films have been deposited on Si(100) with and without a ceramic interlayer, n…
The structural details of high-speed melt-spun nylon 6 fibers at spinning speeds ranging from 4500 to 6100 m/min were investigated by solid-state proton nuclear magnetic resonance (1H NMR) spectroscopy, density and birefringence measurements, differential scanning calorimetry (DSC), and X-ray diffraction (XRD). The an…
To investigate the effect of reactive compatibilization in the immiscible poly(ethylene terephthalate) (PET)/polystyrene (PS) blend, poly(styrene-co-methacryloyl carbamate) (PSM) was synthesized as a reactive compatibilizer. The interfacial reaction of the carbamate group in PSM with OH/COOH in PET was confirmed by at…
Polarization modulation infrared linear dichroism has been used to study the molecular orientation and relaxation of polystyrene/poly(2,6-dimethyl 1,4-phenylene oxide) (PS/PPO) miscible blends, containing up to 20% PPO, during and after a rapid uniaxial deformation above Tg. In general, it is found that both the PS an…