Materials Literature
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Based on local-density functional calculations, we study the exchange interactions between magnetic dopants Cr, Mn, and Fe in the III-V compounds GaAs, GaN, and AlN. We show the magnetic exchange interactions deviate strongly in behavior expected from simple models, and may explain the observed maximum in critical tem…
Increasingly stringent legislation controls emissions from internal combustion engines to the point where alternative power sources for vehicles are necessary. The hydrogen fuel cell is one promising option, but the nature of the gas is such that the conversion of other fuels to hydrogen on board the vehicle is necess…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogels for Tissue EngineeringKuen Yong Lee and David J. MooneyView Author Information Departments of Biologic & Materials Sciences, Chemical Engineering, and Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109 Cite this: Chem. Rev. 2001, 101, 7, 1869…
Physical-chemical and optical properties of glassy system Ga-Ge-S, doped with Nd<SUP>3+</SUP>, Er<SUP>3+</SUP> were treated from viewpoints of differential-temperature analysis, Raman and luminescence spectroscopy. Strong correlation between network structure and luminescence efficiency of Ga-Ge-S:Nd, Er system is est…
Abstract Two new chitosan azacrown ethers bearing hydroxyl groups (CTS‐DH and CTS‐DO) were synthesized by the reaction of 3‐hydroxyl‐1,5‐diaza‐cycloheptane and 3‐hydroxyl‐1,5‐diaza‐cyclooctane with epoxy‐activated chitosan. Their structures were characterized by elemental analysis, infrared spectra analysis, and X‐ray…
The synthesis and characterization of several mesogenic antiferroelectric gels obtained by in situ photopolymerization of mixtures of a nonchiral diacrylate and a nonreactive compound with an antiferroelectric SmC* A phase is described. Along with kinetic aspects from their photopolymerization processes, information h…
Charge-transfer complex formation between the push−pull zwitterionic molecule 7,7-bis(piperazino)-8,8-dicyanoquinodimethane and picric acid is observed in the solid state. The critical role of proton transfer and intermolecular H bonding in facilitating the charge-transfer interaction is established through control ex…
Abstract Polypropylene (PP) and acrylonitrile–butadiene–styrene (ABS) blends were prepared by a melt extrusion process. PP‐ g ‐acrylic acid was used as a compatibilizer. Blends with various compositions of PP, compatibilizer, and ABS were prepared and studied for morphological and mechanical properties. PP‐rich ternar…
The literature on physicochemical aspects of perfume performance has been reviewed with emphasis on products for home and body care. Pertinent expressions related to perfume performance have been defined. For the first time a model study is presented to account for the dynamic aspects in applications of perfumed fabri…
Abstract The thermal properties and the moisture absorption of three types of polyimide/montmorillonite nanocomposite were investigated: 3,3′,4,4′‐biphenyltetracarboxylic dianhydride‐4,4′‐oxydianiline (BPDA‐ODA); pyromellitic dianhydride‐ODA (PMDA‐ODA); and 3,3′,4,′‐benzophenone tetracarboxylic dianhydride‐ODA (BTDA‐O…
Abstract The effect of incorporating phthalate, 1,8‐naphthalenedicarboxylate, and 1,8‐anthracenedicarboxylate structural units on the crystallization rate of PET are evaluated by isothermal and dynamic calorimetry. Although all of the comonomers retard crystallization, the 1,8‐naphthalene unit shows no concentration d…
Abstract We investigated the kinetics of the oxidative chemical copolymerization of 2‐methoxyaniline (OMA) and 3‐aminobenzenesulfonic acid (MA) by monitoring monomer depletion with 1 H NMR spectroscopy. We adapted a semiempirical kinetic model, previously used for OMA homopolymerization, for the consumption of both OM…
Abstract We studied the kinetics of the oxidative chemical homopolymerization of 2‐methoxyaniline (OMA) in aqueous acid solutions by monitoring OMA depletion with 1 H NMR spectroscopy. We used the same semiempirical kinetic model used for aniline (ANI) homopolymerization to evaluate the experimental data. The reaction…
We study the dynamics of a hard-core tracer particle (TP), performing a biased random walk in an adsorbed monolayer composed of mobile hard-core particles undergoing continuous exchanges with a vapor phase. In terms of an approximate approach, based on the decoupling of the third-order correlation functions, we obtain…
Abstract Water crosslinking reactions of LDPE, PP, LLDPE, and the LDPE/PP and LDPE/LLDPE blends are investigated. Degrees of crosslinking of these samples are quantitatively compared and discussed in detail in terms of crosslinking ability, phase‐separation behavior, molecular weight (or viscosity), morphology of the…
Abstract We carried out tensile impact test and very low speed tensile test on ethylene‐based Ionomers (E/15wt %MAA) to clarify the relation between impact toughness and high‐ordered structure. We also studied the changes in high‐ordered structure under deformation by observing Differential Scanning Calorimetory (DSC)…
The first joint refinement of a local wave-function model from diffraction and Compton scattering data is reported. The proposed method suits particularly well the case of insulators. Crystalline magnesium oxide, for which both accurate directional Compton profiles and low-order structure factors are available, is cho…
The mechanism and strength of polymer bridging flocculation have been investigated by experiments on a four-component clay−polymer−salt−water system consisting of butylammonium vermiculite, poly(ethylene oxide) (PEO), butylammonium chloride, and water. The system was studied by neutron diffraction as functions of the…
The curing of polymer substrates with collimated beam of accelerated plasma is considered as a new method of LC alignment. As an aligning polymer we used polyninylcinnamate (PVCN), well known photoaligning material. Pretilt angle and anchoring energy of LC on PVCN substrates is investigated as a function of the incide…
Abstract Effects of silane grafting and water crosslinking reactions on crystallizations, melting behaviors, and dynamic mechanical properties of the LDPE/LLDPE blends are investigated using DSC and DMA. From DSC data, cocrystallization of LDPE and LLDPE does not occur, but cocrosslinking of these two polymers is evid…