Materials Literature
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Noble metal nanoparticles have been used for more than 2000 years. Applications currently under discussion include solar cell technology, catalysis, and nonlinear optics, where the enormous interfacial surface area of the colloidally dispersed metals and their unique electronic properties resulting from size quantizat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromism of Dithienylethenes with Electron-Donating SubstituentsMasahiro Irie, Kazuyuki Sakemura, Masakazu Okinaka, and Kingo UchidaCite this: J. Org. Chem. 1995, 60, 25, 8305–8309Publication Date (Print):December 1, 1995Publication History Published online1 May 2002Pub…
Monte Carlo molecular modeling simulations have been performed to investigate some of the microscopic mechanisms underlying smectite clay swelling. The systems we have studied represent hydrated Wyoming montmorillonites in which the counterions are Li+, Na+, or K+. For each of these three counterions we have conducted…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSuperconducting and Semiconducting Magnetic Charge Transfer Salts: (BEDT-TTF)4AFe(C2O4)3.cntdot.C6H5CN (A = H2O, K, NH4)Mohamedally Kurmoo, Anthony W. Graham, Peter Day, Simon J. Coles, Michael B. Hursthouse, Jason L. Caulfield, John Singleton, Francis L. Pratt, William Haye…
Amorphous semiconductors, being intrinsically metastable in nature, exhibit a wide variety of changes in their physical properties, particularly when photoinduced using bandgap illumination. This article reviews the photoinduced phenomena exhibited by amorphous semiconductors such as amorphous hydrogenated silicon (an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescent Chemosensors Based on Energy Migration in Conjugated Polymers: The Molecular Wire Approach to Increased SensitivityQin Zhou and Timothy M. SwagerCite this: J. Am. Chem. Soc. 1995, 117, 50, 12593–12602Publication Date (Print):December 1, 1995Publication History Pu…
A program for evaluating the solution scattering from macromolecules with known atomic structure is presented. The program uses multipole expansion for fast calculation of the spherically averaged scattering pattern and takes into account the hydration shell. Given the atomic coordinates (e.g. from the Brookhaven Prot…
Abstract Novel macromonomers and telechelics of poly(2‐alkyl‐2‐oxazoline) (PROZO) were syn‐thesized by utilizing termination of propagating species (2‐oxazolinium ions) in the living polymerization of 2‐alkyl‐2‐oxazoline (ROZO) with suitable nucleophiles. Two types of p ‐vinylbenzyl–type macromonomers were obtained by…
Abstract Polythiophene films have been deposited on a platinum electrode surface by direct oxidation of thiophene in BF 3 ‐ethyl ether solution containing a controlled amount of water (5 mM). The electric and mechanical properties of the films were studied. Experimental results demonstrated that the films prepared at…
Abstract Copolyesters containing rigid segments (naphthalene and terephthalene) and flexible seg‐ments (aliphatic diol) structure were synthesized from DMN/DMT/EG (2,6‐dimethyl naphthalate/1,4‐dimethyl terephthalate/ethylene glycol) ternary monomers with various mole ratios. Copolyesters having intrinsic viscosities o…
Abstract The dielectric behavior of an epoxide/ethylenediamine formulation has been studied during cross‐linking in the frequency range 10 3 −10 10 Hz at 25°C and 70°C. Dielectric data were collected both in the frequency and in the time domains and analyzed in terms of a combination of two Havriliak‐Negami functions.…
Abstract Four photoreactive coumarin derivatives were successfully synthesized from 7‐hydroxy‐coumarin and 7‐hydroxy‐4‐methylcoumarin, i.e., 7‐propionyloxy‐4‐methylcoumarin (M 1 ), 7‐palmitoyloxy‐4‐methylcoumarin (M 2 ), 7‐propionyloxycoumarin (M 3 ), and 7‐palmitoy‐loxycoumarin (M 4 ). Reversible photodimerization (3…
Abstract Six different polyesters ( 6a–6c and 7a–7c ) were prepared by the bulk polycondensations of the respective combinations of 1,4:3,6‐dianhydro‐D‐glucitol ( 3 ) and 1,4:3,6‐dianhydro‐D‐mannitol ( 4 ) with succinyl dichloride ( 5a ), glutaryl dichloride ( 5b ), and adipoyl dichloride ( 5c ) at 140–180°C. Polyeste…
Abstract The graft copolymerization of acrylonitrile (AN) onto a styrene‐maleic acid copolymer (SY‐MAc) with ceric ammonium nitrate (CAN) as a redox initiator in an aqueous medium has been studied. The effects of various reaction parameters, including reaction time and temperature, concentrations of initiator, nitric…
Abstract Typical polypropylene fibers for use in light nonwoven fabrics were produced in a full scale compact‐spinning line. Molecular weight distribution (MWD), extrusion temperature, draw‐down ratio, and draw ratio were varied. The fibers were thermally bonded (welded) into nonwoven fabrics, at different bonding tem…
Abstract Polycondensation of 1,4,5,8‐naphthalenetetracarboxylic dianhydride (NTDA) with 3,3′‐diaminobenzidine (DAB) and 3,3′4,4′‐tetraaminodiphenyl ether (TADPE), respectively, in N,N′ ‐dimethylacetamide (DMAc) at room temperature was found to produce high‐viscosity polybenzimidazobenzophenanthroline (PBIPA) precursor…
Abstract A multicompartment model is proposed for a semibatch melt polycondensation of poly(ethylene terephthalate) in a rotating disk polymerization reactor and compared with laboratory experimental data. The reactor is a horizontal cylindrical vessel with a horizontal shaft on which multiple disks are mounted. The r…
Abstract Effects of composition, compatibilization, and blending procedure on oxygen barrier properties of injection‐molded polypropylene/polyamide 6 blends were investigated. The main attention was paid to the relationships between oxygen permeability, mechanical properties, and blend morphology. The effect of the po…
Abstract Brief thermal curing of papers treated with an aqueous solution of polyfunctional carboxylic acids and NaH 2 PO 4 imparts substantial wet strength to the papers. The effectiveness of such carboxylic acids increases with their functionality in the order 1,2,3,4‐butanetetracarboxylic acid (BTCA) > tricarball…
Abstract This work examines the properties of starch esters for their possible application as environmentally degradable thermoplastics. The rheological, thermal, and mechanical properties of a series of fatty‐acid esters of high‐amylose starch (as well as the effects of adding plasticizer on some selected properties)…