Materials Literature
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Latex stage epoxidation of natural rubber with in-situ formed performic acid with and without acetic acid at room temperature were studied at various feed composition. Epoxidised natural rubber was characterised by IR, NMR and DSC. A simple kinetic model was developed from laboratory ex perimental data. Various side r…
Abstract We present data on the mechanisms of phototransferred thermoluminescence (PTTL) and optically stimulated luminescence (OSL) in single crystal CaF2:Mn (3%) and in TLD-400 chips. The TL peak under study is the main dosimetry peak near 275 oC. From measurements of the excitation spectra for PTTL it is found that…
Abstract This paper presents an experimentally‐based analysis of the continuous filament regime of the melt‐blowing process. The experiments were performed with a versatile air‐polymer die, several die operating temperatures, and three different polymer feed resins. The measurements discern the effects upon the final…
Abstract Thermal expansivities along the a, b, and c axes of the orthorhombic unit cell of poly (ether‐ether‐ketone (PEEK) crystals have been determined from 160 to 470 K by wide‐angle x‐ray diffraction. The expansivities along the a and b axes are positive while the expansivity along the c (chain) direction is negati…
We report the design and performance of narrowband transmission filters employing the rapidly changing extinction coefficient that is characteristic of BaF(2) and SiO(2) films within certain wavelength intervals in the vacuum ultraviolet. We demonstrate the design concept for two filters centered at 135 nm for BaF(2)…
Abstract 2,5-Bis(dicyanomethylene)-2,5-dihydrofuran with a 2,5-furanoquinonoid skeleton and its extensive conjugated homologues, 5,5′-bis(dicyanomethylene)-5,5′-dihydro-Δ2,2′-bifuran (8a), and 5,5″-bis(dicyanomethylene)-5,5″-dihydro-Δ2,2′:5′,2″-terfuran (12a), have been prepared as a new type of oxygen-containing elec…
<div class="htmlview paragraph">Twenty-two physical and chemical properties of a typical automatic transmission fluid were determined. In most cases the properties were determined over a range of temperatures. In general, air solubility, volumetric thermal expansion, and specific heat increase with increasing te…
The effective thermal conductivity of binary dispersed composites prepared from mixed and compacted powders of AgCl and low-density polyethylene was measured over the entire range of volume fraction at temperatures in the range 100–330 K together with pressures up to 1.75 GPa. Measurements were made using the transien…
Abstract A simple method for the consolidation of all of the conventional cushion curves for a particular material into a single relationship is discussed. The method requires only one of the usual cushion curves for an arbitrary drop height and cushion thickness to deduce the dynamic stress‐strain curve for the mater…
Abstract The thermal annealing properties of (H3O4)0 centres in single crystal SiO2 were studies by means of electron spin resonance (ESR). The data indicate that these centres take part in the TL process at 110 oC in this material. The mechanism suggested for this TL signal is the thermal release of electrons from (G…
The possible use of Fourier transform infrared reflection‐absorption spectroscopy (FT‐IRAS) and Raman spectroscopy for surface studies of thin (<10 nm) corrosion products on Cu has been explored. Cu samples were exposed to 75% relative humidity and 25°C in flowing air, with additions of 0.25 ppm of SO 2 and NO 2 . X‐r…
Abstract The efficiency of α, I pair creation at exciton decay is high at 4.2 K for KCl, KBr, and RbBr crystals for which H centers are oriented along 〈110〉. The efficiency of α, I pair creation by VUV‐irradiation at 4.2 K is extremely low for NaCl crystals for which H centers are oriented along 〈111〉. The process of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe use of an electrogenerated cobalt(I) porphyrin for the homogeneous catalytic reduction of dioxygen in dimethylformamide. Reactions of [(TMpyP)CoII]4+ and [(TMpyP)CoI]3+ where TMpyP = meso-tetrakis(1-methylpyridinium-4-yl)porphyrinD. Sazou, C. Araullo-McAdams, B. C. Han,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleEffect of a coalescing aid on polymer diffusion in latex filmsYongcai Wang and Mitchell A. WinnikCite this: Macromolecules 1990, 23, 21, 4731–4732Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 October 1990https://pubs.ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn situ FTIR and XPS studies of the hexacyanoferrate redox systemMonika. Datta and Arunabha. DattaCite this: J. Phys. Chem. 1990, 94, 21, 8203–8207Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 October 1990https://pu…
Abstract A thermodynamic framework for the analysis of gas sorption in glassy polymers is established in the limit of low sorption levels. The results represent an extension of the Flory‐Huggins theory to materials with nonzero internal energy changes due to deformation; the Flory‐Huggins theory is recovered in the li…
Linearly polarized laser light is scattered from an oscillating, acoustically levitated bubble, and the scattered intensity is measured with a suitable photodetector. The output photodetector current is converted into a voltage and digitized. For spherical bubbles, the scattered intensity I(rel)(R,theta,t) as a functi…
The dramatic proliferation of products based on semiconductor technology is a strong testament to the predictability and reliability of solid-state technology. In a similar vein, advances in materials exhibiting high levels of ionic conduction in the solid state has led to worldwide efforts in the development of all-s…
CenA from Cellulomonas fimi is a beta-1,4-endoglucanase that binds tightly to cellulose. X-ray-scattering analyses show that the enzyme is tadpole-shaped: the previously identified catalytic and cellulose-binding domains comprise the head and tail respectively. It appears that this structural and functional organizati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimple design of monolith reactor for selective catalytic reduction of nitric oxide for power plant emission controlMarek A. Buzanowski and Ralph T. YangCite this: Ind. Eng. Chem. Res. 1990, 29, 10, 2074–2078Publication Date (Print):October 1, 1990Publication History Publish…