Materials Literature
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Permeability to water vapor and oxygen, elastic modulus, tensile strength, and impact strength of polystyrene–polypropylene and high-impact polystyrene–polypropylene blends were determined as functions of blend composition and morphology. Three types of styrene–butadiene block copolymers were tested as compatibilizers…
The compatibilizing effect of the triblock copolymer poly(styrene-b-butadiene-b-styrene) (SBS) on the morphology and mechanical properties of immiscible polypropylene/polystyrene (PP/PS) blends were studied. Blends with three different weight ratios of PP and PS were prepared and three different concentrations of SBS…
The properties and structure of mixtures of ferrocene and poly(furfuryl alcohol) (PFA) were studied on carbonizing it at different temperatures up to 800 °C. Samples carbonized above 700 °C showed high heterogeneous electron transfer rates comparable to that of a platinum electrode, when these were used as working ele…
The crystallization studies revealed that the high-density polyethylene (HDPE) and linear low-density polyethylene (LLDPE) formed strong cocrystalline mass when they were melt blended in a single screw extruder. The progress of crystallization was observed through a small-angle light scattering instrument, scanning el…
Five kinds of metal-containing fluorinated polyimide films were prepared by thermal curing of poly(amic acid)s containing metallic salts or organometallic complexes. The chemical states, average sizes, and spatial distribution of the metallic particles were examined, and the thermal and optical properties of the films…
The manganese(III) complex K[MnL(py)(2)].py (H(4)L = 1,2-bis(2-hydroxybenzamido)benzene, py = pyridine) reacted as a ligand complex at the two phenoxo oxygen atoms with metal(II) ion and 2,2'-bipyridine to give a series of heterometal complexes [Mn(MeOH)L(OH)M(bpy)](2) (M(II) = Zn (1); Cu (2); Ni (3); Mn (4)). X-ray s…
In situ dynamical study of the photoinduced orientation of the DR1 azobenzene derivative in a doped PMMA matrix and in p(DR1A- co -MMA) copolymers was carried out using real-time visible and infrared spectroscopies. The different mechanisms occurring during the photoisomerization cycles were highlighted by following t…
A silane coupling agent with a benzoxazine functional group has been synthesized. A series of nonpolar solvents is found to favor benzoxazine monomer formation. Employing these nonpolar solvents, a high-purity benzoxazine functional silane coupling agent is obtained. The effectiveness of this silane coupling agent is…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorLiving Polymerization of Phenylacetylene by Novel Rhodium Catalysts. Quantitative Initiation and Introduction of Functional Groups at the Initiating Chain EndYoshihiko Misumi and Toshio MasudaView Author Information Department of Polyme…
Solid films consisting of close-packed arrays of InP quantum dots have been prepared by slowly evaporating colloidal solutions of InP quantum dots. The diameters of the quantum dots were controlled to be between about 30 to 60 Å; size-selective precipitation yielded a size distribution of about 10% about the mean diam…
We have developed an analytical theory which describes the equilibrium structure of a polyelectrolyte brush interacting with oppositely charged sublayer. We consider sparsely grafted polyions with quenched charges that are immersed in a salt-free solution and form a brush of thickness H . An oppositely charged sublaye…
A series of rigid-rod bispropargyl thermoset monomers have been synthesized. These monomers were examined by differential scanning calorimetry (DSC) and hot stage polarized optical microscopy. Enantiotropic or monotropic nematic liquid crystalline phases were observed for all but two monomers. Partial curing of these…
The photoelectrochemistry of two new groups of surfactant carboxyporphyrins is described. The surface active porphyrins deposited onto a SnO 2 semiconductor surface exhibit an unusual photoelectrochemical effect: a substantial and stable photocurrent/photovoltage is generated in modified photoelectrode cells that poss…
Photochemical studies of molecules in the organized voids of microporous frameworks is an area of considerable research interest. In this study, we have examined the spectroscopy and photochemistry of trans -azobenzene introduced into the 8 Å channels of an aluminophosphate framework, AlPO 4 -5. The acidity of alumino…
From the reaction of Au with alkali metal polysulfide liquids, LiAuS and NaAuS were discovered. Orange crystals of LiAuS crystallize in the monoclinic space group C2/c, (no. 15), with a = 8.994(2) Å, b = 8.956(2) Å, c = 7.201(3) Å, beta = 128.68(1) degrees, and Z = 8. Light-yellow planks of NaAuS crystallize in the or…
Chiral 12-metallacrown-4 complexes can now be obtained in high yield using resolved β-phenylalanine hydroxamic acids as organic scaffolding. These new copper(II) compounds bear a striking resemblance based on size and shape to Cu(II) tetraphenylporphyrin. This suggests that metallacrowns may be useful alternatives to…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Transient Liquid Crystalline Phase as a Precursor for Crystallization in Random Co-polyester FibersG. E. Welsh, D. J. Blundell, and A. H. WindleView Author Information Department of Materials Science and Metallurgy, University of…
In an attempt to abstract the structural units of widely known silicate, phosphate, and arsenate compounds based on a transition-metal oxide (TM oxide) framework, we have gained some new insight into the study of “nanostructured” materials and their corresponding electronic and magnetic properties. In this review, we…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelective Population from the Excited Multiplet States to the Triplet Ground State in a Phthalocyanine: A New Concept for Controlling Magnetic Properties by PhotoexcitationKazuyuki Ishii, Yoshiharu Hirose, and Nagao KobayashiView Author Information Department of Chemis…
The genes encoding the enzymes in the (D)-glucarate/galactarate catabolic pathway have been identified in the Escherichia coli genome. These encode, in three transcriptional units, (D)-glucarate dehydratase (GlucD), galactarate dehydratase, 5-keto-4-deoxy-(D)-glucarate aldolase, tartronate semialdehyde reductase, a gl…