Materials Literature
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The formal exchange of the pyrrole units of porphyrin by bipyrrole units provides the title compound 1. The hexadecaethyl derivative of 1 is the only isolable product of a MacDonald condensation of tetrapyrrolic as well as of dipyrrolic components. The new cyclooctapyrrole adopts a figure-eight conformation in the sol…
Raman and XPS measurements have been performed on KI crystals irradiated near 200 K. The Raman studies show I3 − and In − (n = 5, 7,—) clusters which anneal together with F- and V- centres at 338 K. A small development of (I2)n aggregates occurs during the anneal; these decay near 378 K and are responsible for a broad…
Abstract Semiempirical Molecular Orbital Calculations (MNDO AM1) support kinetic results concerning the molecular mechanism of thermal degradation of PVC and show that under special conditions radical and ionic mechanisms are also possible. The degradation of poly(vinyl chloride) is a complex chain dehydrochlorination…
Abstract Multilayer LDPE/nylon‐6 films with an overall content of 71 wt% LDPE, 24 wt% nylon‐6, and 5 wt% PE‐based tie‐layer adhesive were reprocessed under both minimal and extensive mixing conditions. Thermal and mechanical properties, oxygen and water vapor permeability, and morphology of the reprocessed samples wer…
Abstract A constrained non‐linear deconvolution method was used to analyse the Raman spectrum of amorphous carbon. The method was tested by applying it to a model spectrum. Before the deconvolution the observed Raman spectrum was smoothed by a least‐squares convoluting procedure. The proper width of the spread functio…
Abstract The kinetics of the thermal degradation of solid powdered poly(vinyl chloride) (PVC) under nitrogen was studied by thermogravimetry, rate of hydrogen chloride evolution, and rate of polyene sequence formation. These results are accommodated by a chain mechanism involving initiation by random dehydrochlorinati…
The effect of gravity on the contact angle was calculated using a precise drop shape model. The drop shape, whose surface curvatures change under the influence of gravity, was calculated following Laplace's equation. The total free energy of the three interfacial free energies and the potential energy of the drop were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoving-Bed Reactor Model for the Direct Reduction of Hematite. Parametric StudyEnrique D. Negri, Orlando M. Alfano, and Mario G. ChiovettaCite this: Ind. Eng. Chem. Res. 1995, 34, 12, 4266–4276Publication Date (Print):December 1, 1995Publication History Published online1 May…
Abstract Polypropylene (PP) composites containing 0.30 vol% of talc filler, in addtion to blends modified with an ethylene‐propylene copolymer (EPR) elastomer were prepared and their fracture resistance was determined by the standard Ixod impact test and by a fracture mechanics technique. Effects of composition, type…
Leather tanning industry as a significant polluting source is exposed to stringent effluent limitations. On the other hand, leather processing has a very complex structure in terms of both production and waste streams. A systematic subcategorization approach is required to assess the pollution characteristics and cont…
Abstract Proteins (catalase, albumin, pepsin and lysozyme with different molecular weights and isoelectric points) were differently adsorbed at pH 7.0 on the clay fraction of three raw Na-saturated smectites (Crook and Uri montmorillonites and one hectorite). The adsorption isotherms of proteins on clay minerals showe…
Abstract The degree of crystallinity in polymers is commonly known to significantly affect their mechanical properties. To that extent, it also affects the mechanical properties—such as compression, buckling, and creep—of thermoplastic composites that are matrix dominant. For this reason, it is important that the degr…
We report the kinetics of crystallization as observed in simulations of a charged colloidal suspension under shear. We find that the imposed shear flow inhibits crystal nucleation. Crystallization was only observed for shear rates at or below \ensuremath{\gamma}\ifmmode \dot{}\else \.{}\fi{}${\mathrm{\ensuremath{\tau}…
Abstract. The displacive transformation classification proposed at ICOMAT 79 [I] is reviewed in light of recent progress in mechanistic understanding. Issues considered include distinctions between shuffle transformation vs. self-accommodating shear, dilatation vs. shear-dominant transformation, and nucleated vs. cont…
Cu-Al-Mn shape memory alloys with enhanced ductility have been developed by decreasing the degree of order in the β parent phase. Cu-Al-Mn alloys with Al contents lower than 18% exhibit good ductility with elongations of about 15% and excellent cold-workability arising from a lower degree of order in the Heusler (L21)…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTSynthesis and Photoluminescence of Weblike Agglomeration of Silica NanoparticlesM. S. El-Shall, S. Li, T. Turkki, D. Graiver, U. C. Pernisz, and M. I. BaratonCite this: J. Phys. Chem. 1995, 99, 51, 17805–17809Publication Date (Print):December 1, 1995Publication History Published…
The space charge behavior such as charge distribution and electrical conduction of maleic anhydride grafted LDPE (LDPE-g- MAH) was investigated. Heterocharge was found in LDPE and it decreased with increasing MAH graft ratio in LDPEg- MAH. Conduction currents also decreased with increasing MAH graft ratio. The relatio…
The consistencies among the reported univariant hydrogen pressures in the three two‐phase regions of the Zr‐H system, aZr/δZrH 2‐x αZr/βZr, and βRZr/δZrH 2–x , are evaluated with the thermodynamic constraint derived by Speiser. 16 Hydrogen dissolution in αZr is evaluated by checking the consistencies among the Sievert…
This paper deals with the possibilities of noise suppression in partial discharge (PD) measurements under on-site conditions. After the presentation of previous work, a new concept of designing a digital FIR filter with a fixed order to suppress narrow-band disturbances will be presented. The method will be compared t…
Ternary alloys of NiTiHf, having higher transformation temperatures than binary NiTi shape memory alloys, have been produced and analyzed. Beginning with a base composition of Ni49Ti51’, Hf was substituted for Ti up to 30 atomic percent. Differential scanning calorimetry was used to determine the transformation temper…