Materials Literature
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Although progress has been made in the study of biodegradable polyesters, little attention was given to aliphatic/alicyclic copolyesters. For this reason, we have undertaken systematic studies on the aliphatic/alicyclic copolyesters. As a first step in our research, we have presented the material characteristics (e.g.…
Abstract The effect of environmental factors such as HCO3+ ion, CH3COO- ion, and Ca2+ ion, and microstructure on morphology of corrosion products was investigated in CO2 environments with 0.3MPa CO2 at 80°C. Steel J55 with ferritic-pearlitic microstructure and Steel N80 with martensitic microstructure were used as tes…
Abstract New data on the fracture mechanical properties (Young’s modulus, fracture stress, fracture strain, internal stress, intrinsic stress, and adhesion) and electrical resistance of iron carbonate scales from CO2 corrosion of carbon steel are reported and discussed with respect to mechanistic considerations on loc…
Rubber seed oil was used as a multipurpose ingredient in natural rubber (NR) and styrene butadiene rubber (SBR) compounds. The study shows that the oil, when substituted for conventional plasticiser, imparts excellent mechanical properties to NR and SBR vulcanizates. Further, it also improves aging resistance, reduces…
Abstract Multiphase wet gas flowlines of Tunu field cross the Mahakam River at several locations. Even though the corrosion monitoring systems have shown negligible internal corrosion rates, inspection by intelligent pigging, after six years of service, of two of these flowlines indicated severe internal top of line c…
Abstract The role of acetate (Ac−) ion on the rate of CO2 corrosion has been investigated. The presence of Ac− in oilfield brines can significantly increase the rate of corrosion of carbon steel. In the presence of Ac−, the corrosion rate can increase even if the pH increases. Many corrosion prediction models cannot a…
A kinetic study of the synthesis of poly(4-oxybenzoate) by melt-step growth polymerization using para-propionoxybenzoic acid is reported. The polycondensations obey second-order kinetics, irrespective of whether the reaction was catalyzed or uncatalyzed. Breaks are observed in the kinetic plots, suggesting the presenc…
The mechanical properties of the water-swellable rubber prepared by blending polychloroprene with precipitated silica, crosslinked sodium polyacrylate, polyethylene oxide, and vulcanizing agents—such as stress at break, strain at break, modulus, energy at break, and hardness—were studied before and after swelling with…
Abstract Field experience has shown that CO2 corrosion is considerably reduced at low partial pressures, unless more than 0.1 to 1 mM of acetic acid is present in the water. This paper shows that acetic species actually act as a weak inhibitor of the anodic dissolution reaction, and that the role of acetic acid is cle…
A drop in an axisymmetric extensional ow is studied using boundary integral methods to understand the effects of a monolayer-forming surfactant on a strongly deforming interface. Surfactants occupy area, so there is an upper bound to the surface concentration that can be adsorbed in a monolayer, Γ ∞ . The surface tens…
Free-radical-initiated grafting of maleic anhydride (MA) onto a polylactide (PLA) backbone was performed by reactive extrusion. A concentration of 2 wt % MA in the presence of 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane (Lupersol 101) as the free-radical initiator was used for all experiments. Two reaction temperatur…
Replacement of Na + by Li + has been achieved for sodalites of composition Na 8 [GaSiO 4 ] 6 X 2 and Na 8 [AlGeO 4 ] 6 X 2, where X is a halide, via nitrate melt at 240 °C. The resultant materials have been analyzed by Rietveld analysis of neutron powder diffraction data, and the derived structural parameters are comp…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTRing-Opening Copolymerization of (R)-β-Butyrolactone with Macrolide: A New Series of Poly(Hydroxyalkanoate)sYoji Hori, Hideyuki Hongo, and Toshimitsu HagiwaraView Author Information Central Research Laboratory, Takasago Internationa…
A method for the quantitative analysis of two-dimensional small-angle X-ray scattering (SAXS) patterns with fiber symmetry is proposed and applied to a series of images recorded during straining and relaxation cycles of a two-phase polymer sample at a synchrotron beamline.The studied longitudinal scattering originates…
A series of polybutadiene star polymers were produced by coupling living poly(butadienyl)lithium with dendritic chlorosilane linking agents. The theoretical arm numbers of the stars covered the range from 4 to 64, and the arm molecular weight was kept short with M n(arm) = 10 3 . MALDI-TOF MS and 1 H NMR spectroscopy…
The (hyper)polarizabilities obtained from the two valence bond state model including nonequilibrium solvation are compared to experiment. Specifically, the values of μ g 2 α zz (0) and μ g β zzz (0) in different solvents calculated from the model are compared to experimental measurements for several push−pull polyene…
A new open-framework zinc phosphate, [NH 3 (CH 2 ) 2 NH(CH 2 ) 2 NH 3 ] 2+ 2[Zn 2 PO 4 (HPO 4 )] -, possessing a layered architecture and consisting of alternating inorganic and organic layers, stabilized by multipoint hydrogen bonding has been synthesized hydrothermally. It has the following crystal data: monoclinic…
Single-crystal EPR studies of the Fe−O−Fe dimer, [enH 2 ][{Fe(HEDTA)} 2 O]·6H 2 O, have been performed at both X- and Q-band frequencies and room temperature. Resonances arising from the S‘ = 1, 2, and 3 states have been observed in the powder spectrum at Q-band frequency and analysis by spectral simulation has led to…
The chemical potential of adsorbed film inside cylindrical mesopores is dependent on the attractive interactions between the adsorbed molecules and adsorbent, the curvature of gas/adsorbed phase interface, and surface tension. A state equation of the adsorbed film is proposed to take into account the above factors. Ni…
A series of nanocrystalline solid solutions (CeO 2 ) 1 - x (BiO 1.5 ) x ( x = 0.0−0.5) were synthesized by mild hydrothermal conditions at 240 °C. The products were characterized by X-ray diffraction (XRD), scanning electronic microscope (SEM), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonanc…