Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of nematic interaction in the orientational relaxation of polymer meltsMasao Doi, Dale Pearson, Julie Kornfield, and Gerry FullerCite this: Macromolecules 1989, 22, 3, 1488–1490Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanisms of thermal imidization of a polyamic acid studied by ultraviolet-visible spectroscopyEumi Pyun, Richard J. Mathisen, and Chong Sook Paik SungCite this: Macromolecules 1989, 22, 3, 1174–1183Publication Date (Print):March 1, 1989Publication History Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental characterization of the elution profiles of high concentration chromatographic bands using the analytical solution of the ideal modelSadroddin. Golshan-Shirazi and Georges. GuiochonCite this: Anal. Chem. 1989, 61, 5, 462–467Publication Date (Print):March 1, 1989…
Thirty-five human neoplasms from various sites and of various histologic types and stages were examined with phosphorus-31 magnetic resonance spectroscopy in situ. The tumors included 13 squamous cell carcinomas of the head and neck (lymph nodes), eight Hodgkin lymphomas, six non-Hodgkin lymphomas, four carcinomas of…
The discussion centers on the formulation of a constitutive model for brittle solids satisfying two conflicting requirements: simplicity and accuracy. Owing to the inherent complexity oif the problem, stemming from the random distribution of interacting defects, analytical expressions relating macrofields are possible…
Some Thalassiosira species with undulated valves have been examined in light and electron microscopes, partly by using type material. Two groups of taxa are distinguished based on the internal valve structure. Thalassiosira lacustris, T. australiensis and T. gessneri from fresh or brackish water have radial zig-zag pa…
The strength distribution of fibers within a two‐dimensional laminate ceramic/ceramic composite consisting of an eight harness satin weave of Nicalon continuous fibers within a chemically vapor infiltrated SiC matrix was determined from analysis of the fracture mirrors of the fibers. Comparison of the fiber strengths…
Abstract The plasma polymerization of allylamine in an inductively coupled rf plasma reactor is analyzed by Fourier transform infrared spectroscopy. Comparison of the infrared spectra of the as‐received monomer and the plasma polymerized film reveals a conversion of the primary amine in the monomer (CH 2 NH 2 ) to a…
Abstract The α‐relaxation process of seven commercial diglycidyl ether of bisphenol‐A (DGEBA) epoxy resins of varying molecular weights, without hardener, was characterized by measuring the frequency and temperature dependence of the complex permittivity, (ϵast;). The temperature dependences of the frequency of maximu…
Abstract Calcareous Vertisols and associated Inceptisols are abundant around the River Guadalquivir Valley, southern Spain. They support a profitable rainfed agriculture; little is known, however, about their phosphate status and fertility. For this reason the phosphate fractions in the Ap horizons of 24 of such soils…
We present a Landau theory for transitions among tilted hexatic phases in liquid-crystal films. Using the renormalization group, we then derive phase diagrams with four tilted hexatic phases: the hexatic-I and hexatic-F phases, an intermediate hexatic-L phase, and an unlocked phase. If the films are crystalline rather…
Abstract This article presents study of melt rheological properties of composites of polypropylene ( i ‐PP) filled with wood flour (WF), at filler concentrations of 3–20 wt%. Results illustrate the effects of (i) filler concentration and (ii) shear stress or shear rates on melt viscosity and melt elasticity properties…
Abstract Sorption and dilation in the system poly(ethyl methacrylate) (PEMA) and carbon dioxide are reported for pressures up to 50 atm over the temperature range 15–85°C. The sorption isotherms were obtained gravimetrically. The dilation accompanying sorption was measured directly with a cathetometer. At low temperat…
ABSTRACT For a linearly increasing temperature, a differential kinetic model is presented for the determination of kinetic parameters, i.e. activation energy, frequency factor, and reaction order. The performance of this method is illustrated by using two well known chemical reactions: acid‐catalyzed sucrose hydrolysi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility of polymethacrylate/poly(vinyl chloride) blendsJerome F. Parmer, L. Charles Dickinson, J. C. W. Chien, and Roger S. PorterCite this: Macromolecules 1989, 22, 3, 1078–1083Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published…
We realized a surface stabilized ferroelectric liquid crystal display with high contrast ratio and high transmittance using a conventional rubbing method. Such remarkable electrooptical properties are based on the switching between uniform states in a cell treated with an AC electric field in the SmC * . It was confir…
A careful study of the metamagnetic transition in single-crystalline ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4}$ is presented. From magnetic susceptibility measurements the critical exponent (\ensuremath{\beta}) of the weak ferromagnetic state, which terminates at a triple point, has been estimated to be \ensuremath{\beta…
Research Article| March 01, 1989 Aragonite-calcite transformation based on Pennsylvanian molluscs UWE BRAND UWE BRAND 1Department of Geological Sciences, Brock University, St. Catharines, Ontario, Canada L2S 3A1 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1989) 101 (3): 377–390. https://…
High-resolution heat capacity measurements have been made on six mixtures of 40.8 and 60.8, the butyl and hexyl homologs of alkoxybenzylidene octylaniline. The nematic (N)--smectic-A (Sm-A) transition becomes tricritical close to X=0.35, where X is the mole fraction of 60.8. The ${C}_{p}$ data for a mixture with X=0.3…
The degradation reaction kinetics of oxidized polyaniline has been studied employing rotating ring‐disk electrode techniques. Polyaniline films were grown on the disk electrode and were then oxidized at a potential more positive than 0.90V vs. Ag / AgCl , while the degradation product (benzoquinone) was monitored at t…