Scanning Electron Microscopy
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Polyurethane interpenetrating polymer networks. V. Engineering properties of polyurethane–poly(methyl methacrylate) IPN's
Abstract The engineering properties of polyurethane–poly(methyl methacrylate) simultaneous interpenetrating networks (SIN's) were evaluated. The hardness behavior reflected the observed phase inversion in the electron‐microscopic studies. The maximum ultimate tensile strength was observed at 85% polyurethane–15% poly(…
Thermosetting acetylene‐terminated polyphenylquinoxalines
Abstract A series of acetylene‐terminated phenylquinoxaline oligomers have been prepared which cure by addition, without the evolution of volatiles. The synthesis utilized the novel terminal acetylene end‐capping reagent, 3‐(3,4‐diaminophenoxy)phenylacetylene. The end‐capped oligomers were soluble (20–30%) in low‐boil…
Interaction of Cyclodextrin-Containing Polymers with Fluorescent Compounds
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of Cyclodextrin-Containing Polymers with Fluorescent CompoundsAkira Harada, Masaoki Furue, and Shun-ichi NozakuraCite this: Macromolecules 1977, 10, 3, 676–681Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published inissue 1 Ma…
Mixture of Two Anisotropic Antiferromagnets with Different Easy Axes
Thermal and magnetic properties of a mixture of two anisotropic antiferro-magnets with different easy axes have been analyzed both in mean field approximation and in the method of distribution function. A new phase called OAF phase is found within a certain range of concentration. In OAF phase, the spin of each specie…
The "Δη Effect" and Polystyrene-Poly(vinyl methyl ether) Compatibility in Solution
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe "Δη Effect" and Polystyrene-Poly(vinyl methyl ether) Compatibility in SolutionA. Robard, D. Patterson, and G. DelmasCite this: Macromolecules 1977, 10, 3, 706–708Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published inissue 1 May 197…
A statistical approach to the streamer breakdown criterion in SF6
The electrical breakdown field strength in SF6calculated from measurements has been found to deviate considerably from the values predicted by the theoretical models used up to now. The simplest form of the streamer criterion predicts breakdown to take place at field strength - to - pressure ratios close to 8.9 kV/mm…
Viscoelastic Properties of Polydimethylsiloxane Networks Prepared by Cross-Linking the Chains in Solution
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic Properties of Polydimethylsiloxane Networks Prepared by Cross-Linking the Chains in SolutionR. E. Cohen, S. D. Severson, C. U. Yu, and J. E. MarkCite this: Macromolecules 1977, 10, 3, 663–667Publication Date (Print):May 1, 1977Publication History Published onlin…
Thermal degradation of polymers. XVI. Thermal analysis studies on poly(p‐methoxystyrene) and poly(p‐hydroxystyrene) in air and nitrogen
Abstract Comparative thermal degradation studies have been made in air and nitrogen on polystyrene (PS), poly( p ‐methoxystyrene) (PMS), poly( p ‐hydroxystyrene) (PHS) and p ‐hydroxystyrene/styrene copolymers ( p ‐HS/S) by thermal analytical methods (TG and DSC). The degradation behavior shown by these polymers in an…
Effect of Neutron Irradiation on Deformation Behavior of Zirconium
The effect of neutron irradiation on the tensile deformation behavior of zirconium was examined at room temperature at various strain rates ranging of 2.2×10−4~2.2× 10−2 sec−1. The microstructure of the deformed specimens was observed by transmission electron microscopy. It was established that neutron irradiation dim…
Refractive index of GaSe between 045 μm and 330 μm
Using the natural properties of the lamellar compounds, the ordinary refractive index of GaSe has been induced from interferential patterns of transmission and reflection spectra in the low absorption range and from reflectivity spectra in the polar modes range. An analytic development of the refractive index vs energ…
The Thermal Diffusivity and Conductivity of Natural Rubber Compounds
Abstract New methods of measuring the conductivity and diffusivity of rubbers from ambient to 250°C have been developed. The method of measuring diffusivity described in this paper is simple to use and very much quicker than previous methods, the whole temperature range being covered in about half an hour. The accurac…
Cyclophanes. 9. anti-[2.2](2,6)Azulenophane. Synthesis and charge-transfer interaction
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyclophanes. 9. anti-[2.2](2,6)Azulenophane. Synthesis and charge-transfer interactionRoberta Luhowy and Philip M. KeehnCite this: J. Am. Chem. Soc. 1977, 99, 11, 3797–3805Publication Date (Print):May 1, 1977Publication History Published online1 May 2002Published inissue 1 M…
Selenol Esters—A Novel Class of Liquid‐Crystal Compounds
Liquid crystals having favorable transition temperatures have been discovered in the selenol esters of type (1). Their properties should be further enhanced by variation of R1 and R2.
Chain Scission in the Oxidation of Polyisoprene
Abstract The composition of the mixture of volatile products formed during the oxidation in air of natural rubber or synthetic cis -polyisoprene in the raw state was investigated in order to obtain further information on the mechanism of chain scission. An important observation was made: in order to obtain, by means o…
Sintering of Low‐Density Glasses: III, Effect of a Distribution of Pore Sizes
The sintering model presented in Part I is extended by considering a Gaussian distribution of pore sizes in the body. The effect of the breadth of the distribution on the densification kinetics is demonstrated; this effect is small except for very broad distributions. The greatest change occurs in the last few percent…
Diel changes in sedimentation characteristics of Ditylum brightwelli: Changes in cellular lipid and effects of respiratory inhibitors and ion‐transport modifiers1
Temperature‐controlled seawater columns were used to investigate settling rates of Ditylum brightwelli grown on light‐dark schedules. Ficoll density gradient centrifugation was used to examine the effects of KCN, DNP, and the ion‐transport modifiers valinomycin, nigericin, and gramicidin on sedimentation characteristi…
Wet spinning of aliphatic and aromatic polyamides
Abstract Bench‐scale equipment for wet spinning was designed and built. An experimental study of the wet spinning of several polyamides has been carried out. The polymers studied include nylon 6, nylon 66, redissolved Nomex, and redissolved Kevlar. The superstructure of the wet‐spun fibers were studied by optical and…
Elastomer Blend Properties—Influence of Carbon Black Type and Location
Abstract Criteria for minimizing hysteresis in carbon-black-filled elastomer blends are: (1) large black unit size, wide distribution, and low structure; (2) higher black loading in the discrete polymer phase (large zones); and (3) polymer of lower hysteresis as the continuous phase (low black loading). Of the differe…
Effects of the Addition of Phosphorus and Inorganic Nitrogen on Carbon and Nitrogen Mineralization in Andepts From Colombia
Abstract This study tested the hypothesis that the level of available P in volcanic ash soils is a rate‐limiting factor for organic matter mineralization. Additions of calcium phosphate to give levels of P of 1,200 and 2,400 ppm significantly increased the amount of N mineralized and CO 2 evolved as compared to soils…