Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTStudy of the Dual Amorphous Phases in Semicrystalline Poly(ethylene terephthalate) Using the Heat Capacity Increment at the Glass TransitionJun Zhao, Wei Dong, Chaoxu Li, Meili Guo, and Qingrong FanView Author Information State Key Laboratory of Polymer Physics & Chemistry, Joi…
Abstract New lanthanide-quinone and semiquinone complexes with the formula [Ln(L)2(OTf)3] and [Ln(L′)2(OTf)] (Ln = La, Gd, and Yb; OTf = CF3SO3−; L = aminoquinone ligand; L′ = aminosemiquinone ligand), respectively, were synthesized, and the magnetic interaction between f-electrons and organic radicals was revealed.
Abstract A simple and easy technique is proposed for the preparation of dry hexamethylenediammonium adipate (HMA salt), using conventional dry‐blending equipment. The process includes contacting adipic acid and hexamethylenediamine, in the presence of a cryogenic medium, which is used to depress the exothermic of the…
Abstract A study was made of the effects of the initial ibuprofen load and of the specimen shape on the release of ibuprofen from poly(ε‐caprolactone‐ co ‐ D,L ‐lactide). The mol ratio of the comonomers in the copolymer was 96/4 (caprolactone to lactide) and the experiments were conducted at 37°C in vitro . The result…
Abstract Poly( n ‐butyl methacrylate) (PBMA) composites with calcium carbonate (CaCO 3 ) were prepared by in situ radical copolymerization of butyl methacrylate (BMA) and methacrylic acid (MA) with precipitated calcium carbonate. To compare the different rheological behaviors of the monomer mixtures with CaCO 3 and th…
Layer-by-layer (LbL) assemblies between poly(vinylamine hydrochloride- co - N -vinylformamide) [poly(VAm- co -NVF)] with various amounts of VAm and poly(sodium styrenesulfonate) (PSS) from their aqueous solutions were analyzed by the quartz crystal microbalance (QCM) technique, attenuated total reflection (ATR) spectr…
Abstract The use of a petaloid shape for the bottom design for carbonated PET bottles is widespread. Through this study, the causes of bottom cracking were investigated and a novel petaloid bottom was designed. The variations of the physical properties of PET according to the stretch ratio were examined and the stretc…
Reaction between the Os(VI)-nitrido complex, trans-[OsVI(tpy)(Cl)2(N)]PF6 (tpy = 2,2':6',2' '-terpyridine), and ammonia (NH3) under N2 in dry CH3CN gives the mu-1,3-azido bridged [OsII-N3-OsII]- dimer, trans,trans-NH4[(tpy)(Cl)2OsII(N3)OsII(Cl)2(tpy)]. It undergoes air oxidation to give the [OsIII-N3-OsIII]+ analogue,…
Abstract The electrochemical polymerization of azure A has been carried out using repeated potential cycling. The scan potential is set between −0.2 and 1.3 V (vs. Ag/AgCl). The electrolytic solution consisted of 5 mmol dm −3 azure A and 0.5 mol dm −3 Na 2 SO 4 with pH 6.0. The temperature for polymerization was contr…
The dynamic mechanical properties and morphology of novel ethyl acrylate ionomers, poly(ethyl acrylate- co -itaconate) [P(EA- co -ITA)], were investigated. It was found that the P(EA- co -ITA) ionomers showed a well-developed cluster loss tangent peak, which was not seen in poly(styrene- co -itaconate) ionomers. This…
A novel one-dimensional copper(II)-radical complex [Cu(NITmPy)(N3)2(CH3OH)] [NITmPy = 2-(3′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide] has been synthesized and structurally characterized. The structure consists of neutral chains of copper(II) ions alternatively bridged by double symmetric end-on and asymm…
The reaction of iron(III) (meso-tetrakis(N-methylpyridinium-4-yl)porphyrin (Fe(III)TMPyP) with nitric oxide (NO) was studied by electronic absorption spectroscopy, ESR, and electrochemical and spectroelectrochemical techniques in aqueous solutions with pH from 2.2 to 12.0. Fe(III)TMPyP has been found to undergo a redu…
PbS nanocrystals were prepared using water/C 12 E 9 /cyclohexane microemulsions as nanoreactors. The sizes and morphologies of the cubic PbS nanocrystals can be modified by controlling the concentration of ions, the volume ratio of water to surfactant and the reaction temperature. The shuttle-like nanoparticles consis…
The alkali-resistant glass fibers (ARG) are coated with special sizings to provide superior alkali resistance and are designed to reinforce cementitious and other alkali matrixes. The assessment of changes in the fiber surface nanomechanical properties is essential for understanding the fiber bulk mechanical fracture…
Abstract By the use of atomic force microscopy (AFM), formation mechanism of nodular structure in cellulose acetate membranes was systematically investigated. Elementary factors affecting the nodule formation were delineated on the basis of both kinetic and thermodynamic considerations. It was shown that (1) the exact…
Abstract 1 H, 13 C [ 1 H]‐, and 2D HETCOR NMR spectroscopy have been employed to characterize polyacrylonitrile (PAN) homopolymer and copolymers of methacrylic acid (MAA) and itaconic acid (IA) prepared by solvent–water suspension polymerization technique in a mixture containing DMF (solvent) and water. The chemical c…
Abstract The Leeds die‐drawing process has been used to make oriented sheets of toughened polypropylenes. Die‐drawn oriented sheets were produced by drawing at 110°C to draw ratios of 4, 6, and 10. Comparative measurements have been undertaken of the plane stress fracture toughness at room temperature using the essent…
Abstract Nylon 10 12, a newly industrialized engineering plastic, shows a double‐melting phenomenon during melting. Partial melts were obtained when the sample was heated to the temperature between the two melting peaks. A differential scanning calorimeter was used to monitor the energies of the isothermal and nonisot…
A structural characterization of copolymers of syndiotactic polypropylene containing ethylene comonomeric units (PPET) in a wide range of concentrations (0.4−60 mol %) is presented. The copolymer samples are crystalline up to an ethylene content of 18−20 mol %. Ethylene units are partially included in the crystals of…
Sequential amide formation between poly(vinylamine- co - N -vinylformamide)s [poly(VAm- co -NVF)s] with VAm contents of 20, 28, and 42 mol % plus polyAAc using a water-soluble carbodiimide was studied to prepare ultrathin hydrogels on a solid substrate. The analysis of assembly amounts at each assembly step using a qu…