Materials Literature
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The production of spherical crystals has recently gained great attention due to the fact that the crystal habit (form, surface, size, etc.) can be modified during the crystallization process. Spherical crystals of ASA were developed by non-typical and typical spherical crystallization techniques. The non-typical spher…
Blends of two or more ethylene–styrene (ES) copolymers that differed primarily in the comonomer composition of the copolymers were studied. Available thermodynamic models for copolymer–copolymer blends were utilized to determine the criteria for miscibility between two ES copolymers differing in styrene content and al…
New biomedical polymers were designed with attention to the surface of biological membranes, i.e. the surface was completely covered with phospholipid polar groups. The polymers with a phosphorylcholine group, 2-methacryloyloxyethyl phosphorylcholine (MPC) co-polymerized with hydrophobic alkyl group, could interact wi…
Blue-laser irradiation of a single crystal of the chloride salt of a cationic complex, trans-[Ru(en)2(H2O)(NO)]3+ (en = ethylenediamine), yielded MS1 (a metastable state of end-on type) which is remarkably stable (decay temperature Td = 267 K) compared with MS1 of sodium nitroprusside Na2[Fe(CN)5(NO)] (SNP). No MS2 st…
A two-dimensional, coupled, cellular automaton-continuum model was developed to model the evolution of solidification grain structures and the deflection behavior of the columnar dendritic grains solidified in a flowing melt. Al-Cu alloys were solidified on an inclined Cu chill in order to investigate the deflection b…
We present in this paper the main results of 7Li NMR on lithium intercalated in graphite, disordered pregraphitic cokes and other allotropic forms of hexagonal C-lattices like C60 and nanotubes. First we present the main parameters accessible by this technique when this new C-Li bonding is obtained, giving to the soli…
Mitomycin-C (MMC)-loaded poly(DL-lactide) (PLA)/poly(DL-lactide-co-glycolide) (PLGA) films which have different drug loading capacities and thicknesses were prepared by a solvent-evaporation technique. Degradation and release studies were conducted at 37 degrees C in pH 7.4 phosphate buffered saline. The results showe…
Cyanoethylation of jute fiber in the form of nonwoven fabric was successfully achieved using an acrylonitrile monomer which is said to react with the hydroxyl groups of fiber constituents. The degrees of cyanoethylation to different extents were undertaken by varying the reaction time. An IR study showed that extent o…
A new lipophilic guanosine carrying a porphyrin chromophore on the ribose moiety has been prepared: evidence is reported for the formation of a supramolecular complex based on G-quartets and containing an array of eight porphyrins.
To improve the interfacial adhesion between evaporated copper film and poly(ethylene terephthalate) (PET), the surface of PET films was modified by treating with hydrazine monohydrate. The effect of the treatment time in the range of 5-20 min with 80 wt% hydrazine monohydrate at 60 °C on the number of polar groups cre…
In this paper, a new method of fabricating multilayers on a carbon substrate is presented. First, a uniformly charged carbon surface was prepared through molecular design. Then an ultrathin film consisting of layer-pairs of oppositely charged polymeric cationic poly(diallyldimethylammonium chloride) (PDDA) and silicot…
Bimetallic Pt/Rh heterogeneous catalysts based on nanoscaled colloids supported on activated charcoal have been shown to exhibit maximum activity in hydrogenation of butyronitrile at a composition of 10 atom% Pt and 90 atom% Rh in the metallic core. This synergetic effect has to be traced back to the special structure…
Rheology in plastics quality control , Rheology in plastics quality control , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
The synthesis of photocrosslinkable fluorinated polydimethylsiloxanes was achieved through direct hydrosilylation with copoly(dimethyl)(methyl-hydrogen) siloxane. First, the hydrosilylation of a fluorinated olefin allowed the introduction of a fluorinated group onto the polysiloxane. Then, a second hydrosilylation of…
A niobium-containing MCM-41 mesoporous molecular sieve was synthesized by the hydrolysis of tetraethylorthosilicate and niobium pentachloride, using cetylpyridinium bromide as template in acidic medium, and was found to be highly active in the direct conversion of cyclohexene into trans-2-alkoxycyclohexanol at mild te…
Surface modification of textile goods is receiving increased attention. Such modification needs to retain the mechanical strength of the fibre core hut impart surface functionality for a wide range of conceivable uses. To illustrate the methods and strategies used for fibre surface functionalisation the work of the Ge…
Cationic ring-opening polymerization of ϵ-thionocaprolactone was examined. The corresponding polythioester with the number-average molecular weight (Mn ) of 57,000 was obtained in the polymerization with 1 mol % of BF3 · OEt2 as an initiator in CH2Cl2 at 28 °C for 5 h with quantitative monomer conversion. The Mn of th…
Shear dynamic and elongational rheology of concentrated solutions of cellulose in N-methylmorpholine oxide monohydrate (lyocell) were investigated at different temperatures and for two Hencky strains. Shear thinning and strain thinning behavior is characteristic for dynamic viscosity and effective elongational viscosi…
The solid-phase graft polymerization of hydroxymethyl acrylamide (HMA) onto polypropylene (PP) was realized by employing our self-designed pan-type milling equipment which has a unique and smart structure and can exert quite strong shear forces and pressure on the materials in between and break them down. When PP part…
Raman spectra of an L-threonine crystal were investigated as a function of pressure in a diamond anvil cell up to 43 kbar at room temperature. It was observed that the crystal undergoes a phase transition between 20.3 and 22.4 kbar. This transition is accompanied by changes in the external mode region of the spectra,…