Materials Literature
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Polyaniline:2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid has been wet‐spun to yield hollow fibers using dichloroacetic acid as the solvent. The fibers have excellent circular cross‐sections and good surface morphology, as can be seen from the Figure. The permeability of the fibers, as suitable for gas separation, has…
Abstract The effects of polypropylene (PP) and ultrasonic irradiation on the processing and mechanical properties of ultrahigh molecular weight polyethylene (UHMWPE) are studied. The results show that PP can effectively improve the fluidity and mechanical properties of UHMWPE. The Izod notched impact strength increase…
Single crystals of ${\mathrm{GdBaCo}}_{2}{\mathrm{O}}_{5.5}$ layered perovskites have been grown from a flux melt of ${\mathrm{Gd}}_{2}{\mathrm{O}}_{3}\ensuremath{-}\mathrm{BaO}\ensuremath{-}\mathrm{CoO}$ oxides. Magnetic data showed that the ${\mathrm{GdBaCo}}_{2}{\mathrm{O}}_{5.5}$ single crystals exhibit a magnetic…
Abstract Block copolymers of polycarbonate‐ b ‐poly(methyl methacrylate) (PC‐ b ‐PMMA) and tetramethyl poly(carbonate)‐ b ‐poly(methyl methacrylate) (TMPC‐ b ‐PMMA) were examined as compatibilizers for blends of polycarbonate (PC) with styrene‐ co ‐acrylonitrile (SAN) copolymer. To explore the effects of block copolym…
Abstract Polyaryloxydiphenylsilanes were prepared from phosphorus‐containing diols and diphenydichlorolsilane through solution polymerization. With a stoichiometric imbalance in feed monomers, the resulting polymers exhibited moderate melting points and good processing properties. The polymers prepared showed initial…
Abstract Poly(2‐aminobenzoic acid) and poly(3‐aminobenzoic acid) were synthesized by chemical polymerization of the respective monomers with aqueous 1 M hydrochloric acid and 0.49 M sodium hydroxide, using ammonium persulfate as an oxidizing agent. In addition, polymerization in an acid medium was carried out in the p…
X-ray absorption fine structure spectroscopy (XAFS), a powerful tool for the study of the local environment of a particular element, especially the luminescent center, was introduced to investigate the correlation between luminescent properties and local structure around Eu 3+ ions in YBO 3:Eu nanocrystals, which was…
A novel nanoporous carbon−silica composite with medium hydrophilicity is synthesized by a series of methods consisting of preexpansion of the interlayer of graphite oxide (GO) by surfactant intercalation, the intercalation of tetraethoxylsilane (TEOS) and its hydrolysis in the interlayer, followed by post carbonizatio…
Abstract Surface imide hydrolysis of Kapton HN polyimide films in a 1 M KOH aqueous solution was studied using dynamic contact angle measurements, X‐ray photoelectron spectroscopy (XPS) and time‐of‐flight secondary ion mass spectrometry (TOF‐SIMS). The surface energy of Kapton HN increased quickly upon KOH treatment d…
The electrochemical and optical properties of films prepared from two different Fe(II) coordination polymers (TPT[Fe(II)TPT](n)(PF(6))(2)(n) (TPT = terpyridine-phenyl-terpyridine) and CTPCT[Fe(II)CTPCT](n)(PF(6))(2)(n) (CTPCT = chiral terpyridine-phenyl-chiral terpyridine)) and a coordination polymer based on Cu(I) me…
An initiator was intercalated into the interlayer spacings of montmorillonite clay, from which poly(styrene-block-butyl acrylate) silicate nanocomposites were prepared using atom transfer radical polymerization. A mixture of exfoliated structure and intercalated structure was produced in the nanocomposite. The poly(bu…
Abstract The effect of clay modification on organo‐montmorillonite/NBR nanocomposites has been studied. Organo‐montmorillonite/NBR nanocomposites were prepared through a melt intercalation process. NBR nanocomposites were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), dynamic mechani…
Abstract The effects of the incorporation of single‐walled carbon nanotubes (SWNTs) on the physical and mechanical properties of thermoplastic elastomers based on blends of isotactic polypropylene (iPP) and ethylene–propylene–diene rubber (EPDM) are described. A marked decrease of the half‐time of PP–EPDM crystallizat…
Abstract The novel, dimeric titanium( IV )‐substituted phosphotungstate [(TiP 2 W 15 O 55 OH) 2 ] 14− ( 1 ) has been synthesized and characterized by IR and 31 P NMR spectroscopy, elemental analysis, and single‐crystal Xray diffraction. The polyanion consists of two [P 2 W 15 O 56 ] 12− Wells–Dawson moieties linked th…
The extended use of chitosan in biomedical fields has been limited by its insoluble nature in a biological solution. To endow the water solubility in a broad range of pH, chitosan derivatives were prepared by the covalent attachment of a hydrophilic sugar moiety, gluconic acid, through the formation of an amide bond.…
Abstract Nanocomposites of organophilic montmorillonite (C18‐MMT), nitrile–butadiene rubber (NBR), and a coupling agent were produced during a melt compounding process at room temperature. During the process, it was clearly observed that organo‐MMT particles were exfoliated into nanoscale layers of approximately 1–30…
A report of progress in spintronics-related works involving group III nitrides is given emphasizing contradictory opinions concerning basics characteristics of these materials. The actual position of magnetic impurities in the GaN lattice as well as a possible role of magnetic precipitates is discussed. The question w…
A review is given of advances in the field of carrier-controlled ferromagnetism in Mn-based diluted magnetic semiconductors and their nanostructures. Experimental results for III-V materials, where the Mn atoms introduce both spins and holes, are compared to the case of II-VI compounds, in which the Curie temperatures…
Abstract Rubber compounds based on natural rubber (NR) reinforced with octadecylamine‐modified bentonite have been prepared via a vulcanization process and characterized by several techniques. The silicate nanolayers are exfoliated and uniformly dispersed in the polymer chains. Monsanto measurements have shown that th…
Abstract Bicomponent sheath‐core fibers were prepared by a general melt‐spinning method with polypropylene chips and silver nanoparticles. The melt‐spun fibers were characterized by DSC, WAXS and SEM. The antibacterial effect was evaluated by an AATCC 100 test, a quantitative method. The results of the DSC thermogram…