Materials Literature
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Abstract A series of copolyamides of various compositions of nylon 6 and nylon 6,18 were produced. Increased resistance to organic solvents resulted from greater incorporation of nylon 6,18, as shown by decreasing solubility. High‐resolution solution NMR indicated there were four amide carbonyls that corresponded to t…
Abstract Blends and full IPNs' of poly(vinyl chloride) and polybutylmethacrylate (PBMA) have been synthesized and characterized with respect to their mechanical, thermomechanical, and morphological properties. Both the systems displayed a rise in the modulus and ultimate tensile strength and a consequent decreasing te…
Abstract The shear rheological properties of polystyrene (PS)/nano‐CaCO 3 composites were studied to determine the plasticization of nano‐CaCO 3 to PS. The composites were prepared by melt extrusion. A poly(styrene–butadiene–styrene) triblock copolymer (SBS), a poly(styrene–isoprene–styrene) triblock copolymer (SIS),…
Abstract A new method using high‐intensity ultrasonic waves, instead of peroxide‐aided reactive extrusion, was applied to modify a linear polypropylene into a branched structure. The ultrasonic waves induced chain scission and created reactive macromolecules of polypropylene successfully in the melt state without any…
Abstract Several new bisbenzocyclobutene‐terminated aromatic imides, 2,2′‐bis( N ‐4‐benzocyclobutenyl) phthalimide, 2,2′‐bis[4‐( N ‐4‐benzocyclobutenylphthalimide)]‐ether, 2,2′‐bis[4‐( N ‐4‐benzocyclobutenylphthalimide)]‐ketone, and 2,2′‐bis[4‐( N ‐4‐benzo cyclobutenylphthalimid‐4‐oxy) phenyl]‐propane, have been synth…
The diffusion and reaction problem in catalytic pellets of any shape subject to diffusive transport limitations is undertaken in this contribution. Effective reaction rates in three-dimensional (3D) catalysts can be evaluated through a series solution written in terms of powers of (1/Φ) when strong diffusion limitatio…
Small-angle neutron scattering (SANS) measurements were conducted on mixtures of deuterated and normal compositionally symmetric CPCPCPCPCPC (or (CP) 10 ) undecablock copolymers, containing poly(cyclohexylethylene) (C) and poly(ethylene- alt -propylene) (P) blocks. Deuterium labeling was achieved by hydrogenating and…
In terms of the approach to the integration of thermoelectric devices, we proposed a roll-type thermoelectric device. We studied the load characteristics of the thermoelectric microdevices using InN thin films prepared by reactive radio-frequency sputtering. It consisted 60-pair or 120-pair InN-chromel films, which we…
Abstract Resistance to burning is one of the most useful properties that can be imparted to leather. Pyrovatex CP is rich in phosphorus and nitrogen and has been successfully used as a flame‐retardant agent in the presence of etherified methylolated melamine (EMM). The effects of a finishing formulation containing Pyr…
We present an x-ray reflectivity study of molecularly thin films of liquid isobutane adsorbed on liquid glycerol. The glycerol-isobutane interface serves as a model system to investigate the influence of the substrate adsorbate interactions on both adsorption isotherms and capillary wave fluctuations. The measured sur…
3-Hydroxy-3-methylglutaryl-CoA (HMG-CoA) lyase is a key enzyme in the ketogenic pathway that supplies metabolic fuel to extrahepatic tissues. Enzyme deficiency may be due to a variety of human mutations and can be fatal. Diminished activity has been explained based on analyses of recombinant human mutant proteins or,…
We report single molecule laser absorption by carbon nanotubes stamped under ultrahigh vacuum onto Si(100)2x1:H surfaces. Absorption is detected by scanning tunneling microscopy. Images are obtained with and without modulated laser excitation using lock-in amplification and a rear-illumination geometry to reduce therm…
Abstract Graft copolymers of NR and PMMA (i.e., NR‐ g ‐PMMA) were prepared with the bipolar redox initiation system, using various percentages of molar ratios of NR/MMA at 95/5, 90/10, 80/20, 70/30, and 60/40. It was found that the Mooney viscosity, shear stress, and shear viscosity of the NR‐ g ‐PMMA increased with a…
Abstract A series of composites of PPO/PA 6 with improved toughness were synthesized by using ε‐caprolactam as a reactive solvent. Inserting minor PPO macromolecules (1–3 wt %) into PA 6 matrix obviously reduced the crystallinity of PA6. Two crystallization temperatures were found when 6 wt % PPO was added. SEM reveal…
Cu4(OH)6SO4 (1) and Cu4(OD)6SO4 (2) were obtained by hydrothermal syntheses from copper sulfate and sodium hydroxide in H2O and D2O, respectively. They crystallize in the monoclinic system, space group P2(1)/a (14), a = 13.1206(5), b = 9.8551(3), c = 6.0295(2) Angstroms, beta = 103.432(3) degrees, V = 758.3(1) Angstro…
Abstract We prepared polypropylene nanocomposites based on a modified organoclay with isobutyl trimethoxysilane to investigate the effects of such modifications of organoclay on the microstructure and properties of the nanocomposite. The organoclay was preliminarily intercalated with distearyldimethylammonium bromide…
5-Alkenyl-15-alkynylporphyrins have been obtained unexpectedly by [2 + 2] acid-catalyzed condensation of dipyrrylmethane and TMS propynal in addition to 5,15-dialkynylporphyrin, and the unsymmetrical porphyrin can be converted to a butadiyne-linked dimer by selective desilylation of the alkynyl TMS.
Abstract This article reports an experimental and theoretical study of the peroxide‐induced degradation of polypropylene in a corotating twin‐screw extruder. Experiments were performed with different peroxide concentrations and different operating conditions. The evolution of the chemical reaction along the extruder w…
High-resolution transmission electron microscopy and in situ x-ray diffraction analyses have been used to elucidate the compositional sensitivity of the deformation behavior in two β-Ti–Mo-based alloys. The alloy with 8% Mo exhibited conventional elastic∕plastic behavior in tension which corresponds to the irreversibl…
Abstract In the present work, thermoplastic elastomer (TPE)–clay nanocomposites (TPN) based on different rubber–plastic blends from ethylene–octene copolymer [Engage]–Polypropylene and brominated poly(isobutylene‐ co ‐paramethyl styrene)–nylon 6 were prepared by melt blending. Hexadecyltrimethylammonium bromide and oc…