Materials Literature
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Abstract Waste poly(ethylene terephthalate) (PET) from thin bottles was blended with acrylonitrile–butadiene–styrene (ABS) copolymer in different proportions, up to 10 wt %. Styrene maleic anhydride (SMA) copolymer was used as a compatibilizer. The tensile strength and heat deflection temperature of the blend were hig…
Abstract Al(OH) 3 /polypropylene (PP) composites modified by polypropylene grafted with acrylic acid (FPP) were prepared by melt extrusion. Effect of PP grafting with acrylic acid on mechanical properties and fracture morphology of Al(OH) 3 /polypropylene composites were investigated. Although incorporation of Al(OH)…
Abstract Water‐soluble hydroxypropyl chitin (HPC) derivatives were prepared by the reaction of chitin with propylene oxide in homogeneous conditions using a dimethylacetamide/5% lithium chloride solvent system. The reaction conditions for a proper substitution of the hydroxypropyl group were an 80°C reaction temperatu…
A novel disulfide-containing aniline, 1,4-dihydrobenzo[ d ][1,2]dithiin-5-ylamin ( 1 ), was synthesized by the alkylbromination of 1,2-dimethyl-3-nitrobenzene, followed by the formation of a disulfide bond via thioesterification and then the reduction of the nitro group. The monomer showed a reductive and oxidative po…
Abstract The transesterification reaction of poly(ethylene terephthalate)/poly(ethylene 2,6‐naphthalate) blends during melt‐mixing was studied as a function of blending temperature, blending time, blend composition, processing equipment, and different grades of poly(ethylene terephthalate) and poly(ethylene 2,6‐naphth…
Abstract The dynamic mechanical properties of binary hybrids of chlorinated polyethylene (CPE) and acrylic rubber (ACM) with 3,9‐bis{1,1‐dimethyl‐2[β‐(3‐ tert ‐butyl‐4‐ hydroxy‐5‐methylphenyl)propionyloxy]ethyl}‐2,4,8,10‐tetraoxaspiro[5,5]‐undecane (AO‐80) and their ternary hybrids were investigated. The addition of A…
The evolution of the morphology of a crystalline/amorphous diblock copolymer poly(ethylene oxide- b -1,4 butadiene) (P(EO- b -BD)) upon crystallization in thin films was studied via interference optical microscopy. Two-dimensional crystallization confined within the PEO lamellar layers was observed with retention of t…
Analyses of the effects of montmorillonite (clay) on the chain conformation and crystallization of syndiotactic polystyrene (s-PS) thin films are investigated using FTIR spectroscopy, X-ray diffraction, and TEM. The clay is dispersed into the s-PS matrix using a solution blending with scale in 1−2 nm or in a few tenth…
The theoretical and experimental crystal growth shape has been determined for the two whewellite polymorphs. Theoretical studies consisted of PBC analysis, Donnay−Harker, Ising temperature, and Attachment Energy calculations. These calculations were based on accurate energy values, which were specially derived for the…
Abstract Electrochemical polymerization of pyrrole in a solution containing dissolved poly(vinyl alcohol) (PVA) produces a homogeneous, free‐standing, flexible, and conductive polymer film. The films were characterized using infrared spectroscopy, wide‐angle X‐ray diffraction analysis, and scanning electron microscopy…
The molecules of a nematic liquid crystal exposed to an isotropic surface adopt a mean tilt relative to the normal but have no in-plane alignment-that is, they are free to have any azimuthal orientation in the surface plane. Pursuing the theoretical suggestion by Meyer that, in spite of this azimuthal degeneracy, spat…
The pressure-induced structural transition from graphite to diamond is investigated by semi-empirical molecular dynamics simulation. The result shows that the graphite-diamond transition is a cooperative process with large fluctuation. We studied catalyst-aided effect by introducing a simple model into a conventional…
Dynamic magnetic properties of ${\mathrm{Y}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ are reported. The system appears to attain local ferromagnetic order at ${T}_{\mathrm{SRF}}\ensuremath{\approx}70 \mathrm{K},$ where SRF is short-range ferromagnetism. Below this temperature the low-field magnetization becomes his…
Abstract Chitosan and poly(vinyl alcohol) blend fibers were prepared by spinning their solution through a viscose‐type spinneret at 25°C into a coagulating bath containing aqueous NaOH and ethanol. The influence of coagulation solution composition on the spinning performance was discussed, and the intermolecular inter…
Spiders (Araneae) spin high-performance silks from liquid fibroin proteins. Fibroin sequences from basal spider lineages reveal mosaics of amino acid motifs that differ radically from previously described spider silk sequences. The silk fibers of Araneae are constructed from many protein designs. Yet, the repetitive s…
Low-frequency Raman spectra of a diblock copolymer of polystyrene and polyisoprene (PS−PI) and a polystyrene−polybutadiene blend (PS−PB) have been studied. Low-frequency features, viz., the quasi-elastic lines, Boson peaks, and vibrational lines, if present, have been fitted to known theoretical expressions. It has be…
Polarized and depolarized Brillouin scattering experiments on molten ZnCl2 were performed between 300 and 600 degrees C in different geometries. VV spectra measured in backscattering and small angle scattering were analyzed with conventional viscoelastic theory using either a Debye or a Cole-Davidson model for the mem…
The optical absorption spectra of CaS:Eu,Sm at several concentrations of Eu (from 0 to 0.05 mol%) were examined to clarify the electron trapping mechanism for its photo-stimulated luminescence. Corresponding to the electron and hole trapping states, the difference between the absorption spectra after and before excita…
We have investigated the charge-ordering (CO) behaviour of the layered manganites La 2-2 x Sr 1+2 x Mn 2 O 7 (0.3⩽ x ⩽0.8) by means of transport and magnetization measurements. It is found that the CO transitions occur in the very high-temperature region (200-340 K) and moreover the re-entrant CO behaviours are exhibi…
We have investigated $3d$ electronic states of doped transition metals in II-VI diluted magnetic semiconductors ${\mathrm{Zn}}_{1\ensuremath{-}x}{M}_{x}\mathrm{Se}(M=\mathrm{Mn},\mathrm{F}\mathrm{e},\mathrm{C}\mathrm{o})$ and ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}Y(Y=\mathrm{Se},\mathrm{Te}),$ using the tr…