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  • 1
    Electronic Resource
    Electronic Resource
    Crystal synthesis under langmuir monolayersWe thank Mr. J. M. Didymus for assistance with control experiments and Mr. B. Chapman for help with X-ray diffraction measurements. The work was supported by the SERC and ICI plc. (1990)
    Weinheim : Wiley-Blackwell
    Advanced Materials 2 (1990), S. 257-261 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19900020507
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  • 2
    Electronic Resource
    Electronic Resource
    Aliphatic polyureas: Melting points versus intrinsic viscosities (1961)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 5 (1961), S. 384-387 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: An homologous series of aliphatic polyureas of the type where the x = 2, 3, 4, 5, 6, 7, 8, 9, and 12, was prepared from hexamethylene diisocyanate and diamines. The polymers were obtained in powder form with the use of acetone as the solvent. The intrinsic viscosities of the phenolic solutions of these polyureas were found to decrease with increasing polymerization temperature. When the melting points of the polymers were plotted against the intrinsic viscosities within each species of polymer, these melting points were found to increase with the intrinsic viscosity. The curves so formed appeared to approach an asymptote.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1961.070051602
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  • 3
    Electronic Resource
    Electronic Resource
    Polymer constitution and fiber propertiesSome of the unpublished work mentioned in this article is the subject of patent applications due for publication shortly. (1948)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 3 (1948), S. 609-630 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The chemical structure of a large number of linear condensation polymers is correlated with their ability to assume a polycrystalline form possessing the right degree of thermal stability, and with the possession of fiber-forming properties. Certain structures lead to the absence of crystallinity and of fiber-forming properties, while, under certain conditions, a low degree of crystallinity or its complete absence leads to polymers possessing rubberlike properties, which may form highly elastic threads. Some properties of fibers such as solubility, sensitivity to mositure, and certain dyeing characteristics, can be correlated to some extent with chemical structure. These effects are considered on the basis of the introduction of various polar links and ring structures, according to regular patterns, into the polymethylene chain (polythee). The ehter (R—O—) and ester (—CO·O—) links lower the crystallite melting point to such an extent that some polymers containing them are completely noncrystalline at normal room temperatures. Urethan (—O·CO—NH—), amide (—CO·NH—) and urea (—NH·CO·NH—) links raise the crystallite melting point to an extent which increases in the order named. Most other polar links raise the melting point. The introduction into the aliphatic chain of ring structures, particularly aromatic rings directly attached to polar groups, raises the crystallite melting point, but in this case symmetry exerts an over-ruling effect. A low degree of symmetry may lower the melting point and even eliminate crystallinity entirely to the detriment of fiber-forming properties. Inert side chains lower the melting point considerably, and in some cases render the polymer completely noncrystalline at normal room temperatures.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1948.120030501
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  • 4
    Electronic Resource
    Electronic Resource
    An investigation of surface segregation in magnetron-sputtered NbSi using UPS and AES (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 19 (1992), S. 23-26 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Films of amorphous NbSi prepared by magnetron sputtering were found to have a higher concentration of silicon at the surface than in the bulk material. In this paper we report on measurements of both ultraviolet photoemission spectroscopy and Auger electron spectroscopy carried out on samples prepared in situ at the UK Synchrotron Radiation Source, Daresbury. Spectr taken immediately after sputter deposition show that the surface is rich in silicon, while following argon ion bombardment the bulk composition is slowly revealed with a much greater concentration of niobium. This is observed by a comparison of the relative heights of peaks in the Auger spectra and by resonance effects and the sharpening of the Fermi edge in the UP spectra. Of particular interest are changes around the metal-insulator transition that occur at approximately 11 at.% niobium.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740190108
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  • 5
    Electronic Resource
    Electronic Resource
    A third-generation Auger microscope using parallel multispectral data acquisition and analysis (1991)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 17 (1991), S. 71-84 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The Design and construction of an ultrahigh vacuum multi-imaging scanning electron microscope is described. The microscope is designed to contain two field electron emission columns and can acquire simultaneous digital images from a 16-channel electron spectrometer, a four-quadrant back-scattered electron (BSE) detector, an Si(Li) x-ray detector, a SEM detector and the current flowing to ground through the sample. Because there is exact spatial registration between corresponding pixels in each of the images, it is possible to use the image set to make quantitative interpretations of the surface and subsurface chemistry. This is done using mathematical manipulations of the image set, together with models for the SEM, BSE and Auger signals. Techniques are described for setting up the alignment and characterizing the field of view and transmission function of the microscope and its spectrometer. Examples of multi-imaging from simple samples are given. The close coupling between the microscope and its control and interpretation computers provides considerable power for the analysis of inhomogeneous surfaces.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740170203
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  • 6
    Electronic Resource
    Electronic Resource
    Photoemission study of an AuPdAu(111) multilayer grown by MBE (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 20 (1993), S. 919-922 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: An au/Pd/Au(111) multilayer system grown by molecular beam epitaxy has been studied by high-resolution x-ray photoelectron spectroscopy. An analysis of the dependence of the relative intensity of the Au and Pd core-level XPS lines on the take-off angle indicates that the thickness of the Pd sandwhich layer is ∼5 monolayers. The photoelectron spectra show the presence of more than one chemical environment for each element and suggest that the core-level photoelectron spectra of Pd atoms in the interfacial layers and the inner layers of the Pd sandwich are split by ∼0.6 eV. The photoelectron spectra of the valence band show that the Pd sandwich retains the high density of states at the Fermi energy that is characteristic of Pd metal.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740201107
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of Multispectral Microscope Images Using Neural Networks (1996)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 24 (1996), S. 173-180 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: In this study, neural networks have been used to classify the clusters in a scatter diagram formed from images in a multispectral set. The use of multispectral images in surface and materials science has been applied to a number of techniques in recent years. The use of neural networks to analyse multispectral Landsat images of the Earth has already been reported, but has not yet been applied in other fields employing multispectral images. The work reported here used two different neural networks: a three-layer neural net with back propagation and a self-organizing map. The results suggest that neural nets can provide a useful addition to the current multispectral analysis procedures in materials and surface science.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    The inhibitory effect of carboxylic acids on the catalyzed reaction between dimethyl terephthalate and ethylene glycol (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 623-626 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170210230
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  • 9
    Electronic Resource
    Electronic Resource
    Organometallic polymers. XXV. Preparation of polyvinylferrocene (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 1213-1224 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthetic details of solution polymerization in benzene and bulk polymerization of vinylferrocene are reported. In benzene solutions, with azobisisobutyronitrile (AIBN) as the initiator, small yields of low-polydispersity low molecular weight (M̄n ≃ 5000) polyvinylferrocene is obtained. However, high yields can be obtained by continuous or multiple AIBN addition. Higher molecular weight polymers and binodal polymers can be obtained as the monomer concentration is increased. In bulk polymerizations, yields of 80% can be obtained. The molecular weight increases as temperature decreases from 80 to 60°C in bulk polymerizations, and an increasing amount of insoluble polymer results. The soluble portion is often binodal, the higher molecular weight node consisting of an increasingly branched structure. Lower molecular weight polymer was readily fractionated into narrow fractions from benzene-methanol systems, but higher molecular weight polymer proved impossible to fractionate into narrow fractions due to branching.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170110609
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  • 10
    Electronic Resource
    Electronic Resource
    Multilayer barrier films on polyethylene polymerized from CF3H/C2H4 plasmas (1996)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 47 (1996), S. 466-469 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The barrier properties of thin fluorocarbon films toward toluene are studied. Mixtures of trifluoromethane and ethylene are used as monomers in an electron cyclotron resonance plasma discharge. The measured permeation fluxes of toluene through polyethylene show that thin fluorocarbon layers strongly reduce the permeation, e. g. by a factor of about 3000 when an appropriate tapered layer is deposited on polyethylene foils. Different tapering of the barrier layers was investigated with respect to low permeation and good adhesion of the films. The amount of permeated toluene through the untreated and treated polyethylene foils are measured as a function of time using a gas chromatograph with a flame ionization detector.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1996.010471008
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