Materials Literature
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Crosslink dissociation of resole-cured NR vulcanizates was studied using steam aging. Four carbon black-filled NR vulcanizates were prepared to investigate the influence of heated p-t-octylphenol formaldehyde resole (at 160°C for 0.0, 1.5, 3.0, and 6.0 h) on the cure characteristics and stability of the crosslinks. By…
Liquid−liquid equilibria and separation factors for the systems m -cresol + o -toluonitrile + hexane + water + (glycerol or triethylene glycol) have been determined at 313.15 K in order to evaluate their suitability in separating m -cresol from o -toluonitrile. The effects of parameters such as the type of high-boilin…
To obtain an optical polymer with a high refractive index (nD) and Abbe's number (νD), a series of 1,4-dithiane-2,5-bis(thiomethyl) (DBT) group-bearing poly(S-alkylcarbamate) and polyvinylsulfide were synthesized by the polyaddition of 2,5-bis(mercaptomethyl)-1,4-dithiane (BMMD) with diisocyanates and by the addition…
GeX 2 ·dioxane (X = Cl, Br) complexes insert completely into CBr 4 to afford the sterically crowded cluster compounds (BrCl 2 Ge) 4 C ( 1 ) and (Br 3 Ge) 4 C ( 2 ) in 80% and 95% yields, respectively. These display physical, spectroscopic, and structural properties that are indicative of highly symmetric molecules wit…
Large-amplitude oscillatory shear (LAOS) has been applied to a lamellar, microphase-separated, low molecular weight poly(styrene- b -isoprene) diblock copolymer melt to induce macroscopically aligned morphologies. Small-angle X-ray scattering and dynamic mechanical testing were performed to characterize the states of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Frequency EPR Spectroscopy of Large Metal Ion Clusters: From Zero Field Splitting to Quantum Tunneling of the MagnetizationAnne-Laure Barra, Louis-Claude Brunel, Dante Gatteschi, Luca Pardi, and Roberta SessoliView Author Information Laboratoire des Champs Magnetiques I…
The procedure of aggregate-free poly(vinyl chloride) (PVC) solutions for size-exclusion chromatography (SEC) at room temperature using tetrahydrofuran (THF) as the mobile phase is proposed. PVC was dissolved in 1,2,4-trichlorobenzene (TCB) at 130 or 140°C for 6 h, precipitated in methanol, filtrated, and dried. The pr…
Detonation-synthesized nanodiamonds (5 nm in diamenter, containing 10% O as defects) decompose violently when irradiated by pulsed Nd:YAG laser photons at 1064 nm. The irradiation shatters the diamond lattice via multiphoton excitation, yielding CO and CO2 in the gas phase and graphitic spheroidal nanoparticles on the…
Polyaniline (PANI) was doped with p-phenolsulfonic acid (PSA) or 5-sulfosalicylic acid (SSA). The PANI salts were blended with poly(N-vinyl-2-pyrrolidone), poly(N-methyl-N-vinylacetamide), poly(N,N-dimethylacrylamide), or poly(2-methyl-2-oxazoline) by solution casting from dimethyl sulfoxide. Blends containing up to 5…
Three generations of dendrimers with a fluorescent core were synthesized by attaching dendrons of the Fréchet type to a dihydropyrrolopyrroledione (DPP) molecule. Samples were prepared by spin-coating a toluene solution containing 2 × 10 -9 M of the dendrimers and 3 mg/mL polystyrene (MW 45 000) on a glass cover slip.…
The grafting of polymers having controlled molecular weight and narrow molecular weight distribution onto chitosan powder by the termination of living polymer cation with amino groups on chitosan powder was investigated in heterogeneous system. The amino groups of chitosan powder successfully reacted with living poly(…
Three structurally variant alkyl-substituted porphyrins [zinc(II) 2,3,7,8,12,13,17,18-octa- n -decylporphyrin 2, metal(II) meso -5,10,15,20-tetra- n -undecylporphyrin 3 (metal = cobalt, copper, palladium, and zinc), and zinc(II) meso -5,10,15,20-tetrakis(phenoxy- n -nonyl)porphyrin 4] exist as photoconductive insulato…
The mechanical properties of recycled low-density polyethylene/wood flour (LDPE/WF) composites are improved when a maleated triblock copolymer styrene–ethylene/butylene–styrene (SEBS–MA) is added as a compatibilizer. The composites' tensile strength reached a maximum level with 4 wt % SEBS–MA content. The compatibiliz…
Strontium clusters of size 2 to 20 atoms have been studied within the local density approximation using the ab-initio molecular dynamics method with a plane wave basis in which the s and p electron wavefunctions are well represented. The resulting low lying isomers are optimized using a full-potential linear muffin ti…
A newly developed class of paraffin-like organomagadiite intercalates, interlayered by primary, secondary, tertiary, and quaternary onium ions, has been used to form elastomeric polymer-layered silicate nanocomposites by in situ polymerization during the thermoset process. Depending on the nature of the onium ions, in…
A new building block is constructed with one pyridine and two kinetically inert complexed Pd(II) ions, for the controlled assembly of metallodendrimers following either a convergent or a divergent route. The double pincer ligand 8 was cyclopalladated with Pd[CH 3 CN] 4 (BF 4 ) 2 and subsequently converted into the neu…
The conductance of multiwalled carbon nanotubes (MWNTs) was found to be quantized. The experimental method involved measuring the conductance of nanotubes by replacing the tip of a scanning probe microscope with a nanotube fiber, which could be lowered into a liquid metal to establish a gentle electrical contact with…
AgBr microcrystals that have been treated with reducing agents to form small silver clusters on their surface have been examined with low-temperature optical and optically detected magnetic resonance methods. These investigations have indicated that these treatments produce two closely related Ag clusters that are spe…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTXylanase-Catalyzed Synthesis of a Novel Polysaccharide Having a Glucose-Xylose Repeating Unit, a Cellulose-Xylan Hybrid PolymerMasaya Fujita, Shin-ichiro Shoda, and Shiro KobayashiView Author Information Department of Materials Chemistry Graduate School of Engineering…
The chemical processes involved in the reactions between novolac resins, furfuryl alcohol (FA), and hexamethylenetetramine (HMTA) have been studied by solid-state NMR spectroscopy. A highly cross-linked homogeneous network which incorporates both novolac and furan entities is formed. The initial reaction below 90 °C i…