Materials Literature
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Kaolinite clay (KC) surface was modified with different surface modifiers such as methacrylic acid (MAA), polymethacrylic acid (PMAA1, mol wt 10,000) and polymethacrylic acid (PMAA2, mol wt 11,500). The adsorption isotherms of the above modifiers on the surface of KC were determined. The concentrations required for bu…
Although economic, ecological, processing and property considerations suggest that it is very attractive to use lignocellulosic fibers as reinforcement in polymer matrix composites, moisture can strongly and deleteriously affect their properties. In this work the water absorption behavior of sisal/cotton, jute/cotton…
Poly(2-vinylpyridine) microgel particles and polystyrene latex are aggregated in an alternating electric field to produce a new class of microrods. An electric field simultaneously accelerates the aggregation of oppositely charged particles, and templates the aggregates into linear structures. Rods up to 100 μm in len…
The ferroelectromagnet YMnO3 consists of weakly coupled triangular layers of S=2 spins. Below T(N) approximately equal to 70 K muon-spin relaxation data show two oscillatory relaxing signals due to magnetic order, with no purely relaxing signals resolvable (which would require different coexisting spin distributions).…
Scattering of an obliquely incident plane wave by a general-shaped groove engraved on a perfectly conducting plane is rigorously solved. The scattered field is represented by a Fourier-integral representation. To analytically represent the fields in a general-shaped groove, the groove is divided into L number of layer…
A pressed silk sheet is a new biomaterial composed of a network of numerous cocoon filaments and having excellent mechanical strength and shape stability compared to a cotton-gauze sheet. To reconstruct a hard connective tissue using the silk sheet and type-I collagen as the scaffold for fibroblasts, three different t…
In their analysis of our perturbed angular correlation (PAC) study of the magnetic phase transitions of $R{\mathrm{Co}}_{2}$ [Phys. Rev. B 68, 014409 (2003)], Herrero-Albillos et al. [Phys. Rev. B 73, 134410 (2006)] come to the conclusion that it is very difficult for PAC spectroscopy to distinguish a first-order from…
Reifenwechsel: Der Ersatz eines B− in B82− durch C soll zu einem molekularen CB7−-Rad führen, das nun durch Laserverdampfung hergestellt wurde. Nach Ab-initio-Rechnungen hat CB7− eine äußerst stabile planare C2v-Struktur, in der C ein B− in der Felge des B82−-Rads ersetzt (siehe Bild), während die D7h-Struktur mit ein…
ADVERTISEMENT RETURN TO ISSUEPREVNoteThickening Process and Kinetics of Lamellar Crystals of a Low Molecular Weight Poly(ethylene oxide)Xiong-Feng Tang, Xiao-Jin Wen, Xue-Mei Zhai, Nan Xia, Wei Wang, Gerhard Wegner, and Zhong-Hua WuView Author Information The Key Laboratory of Functional Polymer Materials of Ministry…
The effect of cross-linking on the dynamics of amorphous poly(vinyl cinnamate) (PVCN) below and above the glass transition temperature ( T g ) was studied by means of mechanical spectroscopy. The polymer is cross-linked by irradiating it with ultraviolet light, and it is controlled by the irradiation time, where the k…
The montmorillonite (MMT) was modified by butyl acrylate polymer. The newly modified MMT was characterized by TGA and DSC techniques. The modified MMT constitute melamine phosphate and different carbonizing agents and new flame retardant systems for poly urethane (PU) polymer. The flammability properties of the differ…
Ein wenig Nähe hilft: Das abgebildete radförmige {P8W48}-Polyoxowolframat wirkt als Reaktionskammer für den gesteuerten Aufbau zweier bislang unbekannter gemischtvalenter Vanadiumoxidgruppen aus verknüpften Oktaedern und Tetraedern mit VIV- bzw. VV-Zentren. Die magnetischen und elektronischen Eigenschaften werden durc…
The natural fibers (banana, hemp and sisal) and polystyrene (PS) were taken for the preparation of natural fiber polymer composites in the different ratios of 40:60, 45:55, 50:50 and 55:45 (wt/wt), respectively. These fibers were esterified with maleic anhydride (MA) and the effect of esterification of maleic anhydrid…
Poly (styrene-acrylonitrile) (SAN)/clay nanocomposites have successfully been prepared by melt intercalation method. The hexadecyl triphenyl phosphonium bromide (P16) and cetyl pyridium chloride (CPC) are used to modify the montmorillonite (MMT). The structure and thermal stability property of the organic modified MMT…
Abstract New lamellar materials intercalated with molybdenum(II) complexes with potential catalytic properties were prepared by a stepwise procedure. The lamellar material was first calcined at 823 K for four hours to eliminate all the carbonate ions; the layered structure was reconstructed after treatment with a solu…
Abstract The effect of acid activation and thermal treatment of attapulgite on water absorbency of superabsorbent composite were investigated. Under the same preparation conditions, superabsorbent composite prepared with natural attapulgite exhibited a water absorbency of 639 g/g and it merely kept 71% of its initial…
Abstract Two novel heteropolymolybdates, [(CH 3 ) 4 N] 8 n [M(H 2 O) 5 ] 2 n (H 3 O) 2 n [{M(H 2 O) 5 } 2 (MAs V Mo 9 O 33 ) 2 ] n [M(H 2 O) 4 (MAs V Mo 9 O 33 ) 2 ] n · 20 n H 2 O (M = Mn 2+ , 1 ; M = Co 2+ , 2 ), constructed from the new fragment (As V Mo 9 O 33 ) 7– and a transition metal have been synthesized in a…
Abstract A novel synthetic approach was developed for the controllable modification of chitosan (CS) with poly(ϵ‐caprolactone) (PCL). 6‐ O ‐Triphenylmethyl‐chitosan (TMCS) was synthesized as a highly soluble intermediate in organic solvents to facilitate an efficient grafting reaction of PCL onto CS in a homogeneous r…
A series of glutathione (GSH)-capped aqueous CdS quantum dots (QDs) with strong photoluminescence (PL) were prepared by changing the reaction temperatures and times on the basis of optimization of the mole ratio of S to Cd. The reaction time was shortened to about 1/10 compared with that reported previously by increas…
We evaluate the strain amplitude (gamma) dependence of the dynamic storage and loss moduli for polybutadiene elastomers containing carbon black particles of varied size at a constant volume fraction of 0.18. Measurements of the low-strain hysteretic softening (Payne effect or unjamming transition) in both shear and un…