Materials Literature
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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…
Abstract The mechanisms by which hydroxyapatite nanofiller promotes reinforcement in poly(vinylacetate) matrix is investigated. Hydroxyapatite nanofillers with spherical and platelet particle shape were synthesized. Particle size was in the range from 5 to 60 nm. Filler concentration in composites was limited to maxim…
Pyro- and piezoelectric quasiamorphous thin films of BaZrO3 and SrTiO3 are reported. This is the first instance of a polar amorphous solid being created from a compound that does not from polar crystalline polymorphs. The pyroelectric and the piezoelectric properties of the quasi-amorphous SrTiO3 are of the same order…
Nowadays, increasing awareness of replacing synthetic fiber such as glass fiber has emerged due to environmental problems and pollutions. Automotive manufacturers also seek new material especially biodegradable material to be non‐load bearing application parts. This present work discussed on the effect of silane treat…
Strong fringing fields at the entry and exit of a real hemispherical deflector analyser (HDA) significantly degrade the 180° first-order focusing conditions, one of the central advantages of the ideal-field HDA. Over the past 50 years, traditional approaches to cure this problem have primarily sought to suppress these…
Abstract New types of diarylethene dimers bridged by a spiro structure were synthesized. One of their dimers formed three kinds of polymorphic forms by recrystallization from different solvents: hexane ( 1a‐ α), acetone ( 1a‐ β), and acetonitrile ( 1a‐ γ). In crystals of 1a‐ α and 1a‐ β the molecules are packed in sol…
Four novel dinuclear RuII compounds and, for comparison purposes, two corresponding mononuclear complexes containing the PHEHAT or TPAC ligand (PHEHAT=1,10-phenanthrolino[5,6-b]-1,4,5,8,9,12-hexaazatriphenylene and TPAC=tetrapyrido[3,2-a:2',3'-c:3' ',2' '-h:2' '',3' ''-j]acridine) have been synthesized and characteriz…
Abstract This study described the mechanical and thermal properties of hybrid bio‐composites from oil palm empty fruit bunch (EFB) fibers and kaolinite. The polyurethane (PU) used as matrix is formed by reacting palm kernel oil (PKO)‐based polyester with crude isocyanate. The blending ratio of PU to EFB fibers was fix…