Microcellular Polymeric Materials from Microemulsions: Control of Microstructure and Morphology

The effect of a crosslinking agent on the formation of porous solids by polymerizing microemulsions formulated with monomers was investigated. Phenomenological studies were carried out to evaluate the possibility of controlling the morphology of the porous polymeric materials by using precursor microemulsions having a distinct microstructure. A microemulsion system, containing methyl methacrylate (MMA), acrylic acid (AA), the crosslinking agent ethyleneglycol dimethacrylate (EGDMA), water, and sodium dodecylsulfate (SDS) as surfactant, was studied. An identical surfactant-free system, formed using the same monomers, crosslinking agent, and water, but without surfactant, was also studied. Microemulsion samples from both these systems, having a water in oil droplet microstructure and also samples exhibiting bicontinuous microstructural characteristics, were used as precursor systems for polymerization. The morphology of the polymeric solids obtained was examined using scanning electron microscopy and thermogravimetric analysis. The results of this study indicate the possibility of forming porous polymeric solids having specifically tailored morphology and microstructure by the polymerization of monomer containing microemulsions. © 1993 John Wiley & Sons, Inc

University of Akron Bandorama (Nov 7, 1993)

Mr. Jorgensen conducting the Symphonic Band and a selection of the Marching Band pieces.https://ideaexchange.uakron.edu/rdjorgensen_ideas/1031/thumbnail.jp

Faculty Senate Chronicle October 7, 1993

Minutes for the regular meeting of The University of Akron Faculty Senate on October 7, 1993

The Innocent Spouse Relief: A Reconciliation of Conflicting Judicial Interpretations

This paper reviews the statutory requirements for obtaining the innocent spouse relief, briefly identifies the degree of consensus among the courts in interpreting key provisions of the statute, and then focuses on the major area of conflict in qualifying for relief: the lack of knowledge requirement on the part of the alleged innocent spouse. Particular attention is given to the rigid standard utilized by the Tax Court in its interpretation of this critical requirement versus the broader, more flexible standard employed by the U.S. Courts of Appeal for the Eighth and Ninth Circuits. Finally, an analysis of a workable reconciliation of these conflicting standards is set forth, together with some expectations as to the future resolution by the courts

Microemulsion Characterization by the Use of a Noninvasive Backscatter Fiber Optic Probe

This paper demonstrates the utility of a noninvasive backscatter fiber optic probe for dynamic light-scattering characterization of a microemulsion comprising sodium dodecyl sulfate/1-butanol/brine/heptane. The fiber probe, comprising two optical fibers precisely positioned in a stainless steel body, is a miniaturized and efficient self-beating dynamic light-scattering system. Accuracy of particle size estimation is better than +/- 2%

Dynamic Vulcanization of Thermoplastic Copolyester Elastomer Nitrile Rubber Alloys .2. Rheology, Morphology and Properties

The rheological, mechanical, morphological characteristics, and aging resistance in hot oil of thermoplastic elastomer based on multi-block thermoplastic copolyester elastomer (CPET)/nitrile rubber (NBR) have been investigated. The nitrile rubber is dynamically vulcanized during blending with thermoplastic copolyester elastomer. The etching technique was explored to conduct the SEM studies. The prepared thermoplastic elastomers possess excellent mechanical properties and good oil resistance

Gpc Calibration for the Molecular Weight Measurement of Butyl Rubbers

Size Exclusion Chromatography (SEC) or Gel Permeation Chromatography [GPC] was used to determine the molecular weight and molecular weight distribution of butyl rubbers. Quantitative data were obtained by viscometry, and by the use of narrow distribution polyisobutylene (PIB) standards for calibration. The application of the Universal Calibration Principle, which uses readily available narrow distribution polystyrene (PS) standards, relies on the knowledge of the Mark-Houwink-Sakurada constants, K and α, for PIB or butyl rubber (the copolymer of isobutylene and isoprene containing 1–3 mol% of the latter). Comparison of narrow PIB and narrow PS calibrations led us to the selection of KPIB=2×10−4 dl/g and α=0.67, the constants published by the American Standards Corporation for PIB in tetrahydrofuran (THF) at 30°C, as best fit values. The weight average molecular weight [Mw] of various samples of commercially produced butyl rubber determined by using the Universal Calibration Principle with the selected constants, agreed well with those measured by viscometry. Other published K and α values yielded a poorer agreement

Faculty Senate Chronicle March 18, 1993

Minutes for the regular meeting of The University of Akron Faculty Senate on March 18, 1993

Faculty Senate Chronicle May 6, 1993

Minutes for the regular meeting of The University of Akron Faculty Senate on May 6, 1993