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  • 1
    Electronic Resource
    Electronic Resource
    Corrosion inhibition of mild steel by amphoteric surfactants derived from aspartic acid (1993)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 44 (1993), S. 304-308 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Inhibierung der Korrosion von Flußstahl durch von Asparaginsäure abgeleitete amphotere TensideDie Inhibierung der Korrosion von Flußstahl in 0,5 m Salzsäure durch amphotere Tenside (die sowohl eine anodische als auch eine kationische Einheit in einem Molekül enthalten) der allgemeinen Formel (mit R = Alkylgruppe mit C10, 11, 12, 13, 15 und 17) ist durch die Langmuir'schen Adsorptionsisothermen zu erklären. Bei einer gegebenen Tensidkonzentration nimmt die inhibierende Wirkung mit der Länge der Kohlenstoffkette zu. Zu erwähnen ist auch der Einfluß von induktiven und sterischen Behinderungseffekten durch Methylengruppen (in -R) auf den Hemmwert.
    Notes: The inhibition of mild steel corrosion/in 0.5 M HCl solution by amphoteric surfactants (which contain both an anionic and a cationic moiety in the same molecule) of general formula: (R alkyl group of C10, 11, 12, 13, 15 and 17) is shown to confirm Langmuir's adsorption isotherms. At a given concentration of surfactants, the inhibiting action increases with the increase of carbon chain length. The influence of both inductive and steric hindrance effects of methylene groups in -R on the inhibition efficiency has also been mentioned.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19930440705
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorption of ethoxylated alkylphenol-formaldehyde polymeric surfactants at the aqueous solution-air interface (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 33 (1994), S. 247-252 
    Details
    ISSN: 0959-8103
    Keywords: polymeric nonionic surfactants ; ethoxylated alkylphenol-formaldehyde ; adsorption of polymeric nonionics ; 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: The adsorption behaviour of some ethoxylated alkylphenol-formaldehyde polymeric non-ionic surfactants, at the aqueous solution-air interface, was investigated by measuring the surface tension (γ) as a function of concentration (C) at four temperatures. By applying the Gibbs adsorption equation to the γ versus C data, the adsorption isotherms of these polymeric surfactants were obtained.Surface concentration (Λ) of the investigated polymeric non-ionics was found to increase with decreasing temperature and decreasing hydrophobic group (R) chain length, while varying the length of polyoxyethylene chain (%EO) appeared to have an insigificant effect. Effects of temperature, %EO and chain length R on the surface pressure (π) of the surfactant solutions were also investigated.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210330303
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  • 3
    Electronic Resource
    Electronic Resource
    Gas chromatographic/mass spectrometric analysis of cembrenoid diterpenes in kerogen from a lacustrine sedimentDedicated to Professor Herbert Budzikiewicz on the occasion of his 60th birthday. (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 157-162 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Alkaline hydrolysis of kerogen from a Miocene lacustrine sediment (Nördlinger Ries, southern Germany) afforded a series of cembrenoid diterpenes characterized by a 14-membered ring system together with a second, probably related, series of yet unidentified structure. This is the first report of the occurrence of these compounds in fossil organic matter. The interpretation of cembrenoids as molecular markers of arid or semiarid climate is consistent with other information about the depositional environment of the former Nördlinger Ries crater lake.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210280306
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  • 4
    Electronic Resource
    Electronic Resource
    Macromolecular engineering of polylactones and polylactides. XV. Poly(D,L)-lactide macromonomers as precursors of biocompatible graft copolymers and bioerodible gels (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 2099-2110 
    Details
    ISSN: 0887-624X
    Keywords: polylactide ; macromonomer ; ring-opening polymerization ; graft copolymers ; amphiphilic gel ; biocompatible ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The functional aluminum alkoxide, Et2Al—O—(CH2)2—O-C(O)—C(CH3)=CH2, is a very effective initiator for the (D,L)-lactide (LA) polymerization in toluene at 707deg;C. The coordination-insertion type of polymerization is living and exclusively yields linear P (D,L)-lactide macromonomers of a predictable molecular weight and a narrow molecular weight distribution. IR and 1H-NMR studies show that the methacryloyl group of the initiator is selectively and quantitatively attached to one chain end, whereas the second extremity is systematically a hydroxyl function resulting from the hydrolysis of the living growing site. α,ω-Dimethacryloyl-P(D,L)-lactides, i.e., α,ω-macromonomers, have also been successfully synthesized by the additional control of the termination step, i.e., by reaction of Al alkoxide end groups with methacryloyl chloride. α-Macromonomer and α,ω-macromonomer P(D,L)-lactides are easily free-radical copolymerized with 2-hydroxyethyl methacrylate (HEMA), resulting in a hydrophilic poly (HEMA) backbone grafted with hydrophobic P(D,L)-lactide subchains and a biodegradable amphiphilic network, respectively. © 1994 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080321112
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  • 5
    Electronic Resource
    Electronic Resource
    Macromolecular engineering of polylactones and polylactides. XXI. Controlled synthesis of low molecular weight polylactide macromonomers (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 497-502 
    Details
    ISSN: 0887-624X
    Keywords: polylactides ; macromonomers ; ring-opening polymerization ; coordination-insertion ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No abstract.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Macromolecular engineering of polylactones and polylactides. X. Selective end-functionalization of poly(D,L)-lactide (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 505-514 
    Details
    ISSN: 0887-624X
    Keywords: polylactide ; end-functionalization ; living polymerization ; kinetics ; mechanism ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Functional aluminum alkoxides, such as Et3-pAl(O—CH2—X)p, where p = 1,3 and X = a functional group, are very effective initiators for the (D, L)-lactide polymerization in toluene at 70°C. The coordination-insertion type of polymerization is living. Linear polyesters of a predictable molecular weight and a narrow molecular weight distribution are obtained within the period of time required for the total monomer conversion. The functional group (X) associated with the active alkoxy group of the initiator is selectively and quantitatively attached to one chain end, whereas the second end group is systematically a hydroxyl function resulting from the hydrolysis of the living growing site. Asymmetric telechelic polylactides are thus obtained in a perfectly controlled way. A kinetic study has shown that the polymerization is first order in both the monomer and initiator. © 1993 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310222
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  • 7
    Electronic Resource
    Electronic Resource
    Corrosion Inhibition of mild steel in aqueous solution containing H2S by some naturally occurring substances (1998)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 29 (1998), S. 365-370 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The corrosion inhibition of mild steel by some naturally occuring substance was evaluated in absence and presence of 600 and 1200 mg H2S/l in 3% NaCl aqueous solution and pH of 3 and temperature of 25 °C. These naturally occurring substance included the water extracts, coumarines and fatty matters extracts of some Egyptian plants. These plants included:(1) Nigella Sativa (Family Ranunculacease) (Extract (1), 2) Coriandrum Sativum (Family Umbelliferea) (Extract II), 3) Ricinus communis (Family Euphorbiaceae) (Extract III). The galvanostatic anodic and cathodic polarization measurements were used for studying the corrosion behavior of mild steel and evaluation of the percentage inhibition of the undertesting extracts of these three plants and also preparation of fatty matters and coumarin fractions were mentioned.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19980290709
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  • 8
    Electronic Resource
    Electronic Resource
    Computerized GC/MS detection of monoaromatic and triaromatic steroid hydrocarbons in Alamein crude oil (1994)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 17 (1994), S. 549-552 
    Details
    ISSN: 0935-6304
    Keywords: GC/MS ; Crude oils ; Monoaromatic steroids ; Triaromatic steroids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Series of C-ring monoaromatic steroid hydrocarbons (C21, C22, C27 — C29) and triaromatic steroid hydrocarbons (C20, C21, C26 — C28) have been recognized in the aromatic hydrocarbon fraction of Alamein crude oil from the western desert, Egypt. Detection of these compounds were based on mass fragmentography of the key ions m/z 253 and m/z 231 and comparison of the mass spectra and relative retention times with literature data. The predominance of the C29 monoaromatic steroids and C28 triaromatic steroids provide further evidence for a land plant origin of Alamein oil. The results substantiate previous evidence of the occurrence of an aromatization process with increasing maturation and indicate a moderate maturity level for Alamein oil.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240170708
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  • 9
    Electronic Resource
    Electronic Resource
    Contribution à l'étude du comportement de la silice dans les bains de cryolithe fondue (1957)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 40 (1957), S. 2041-2045 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: La détermination des tensions de décomposition, des tensions de polarisation et l'analyse des produits obtenus lors de 1'électrolyse des solutions cryolithiques resp. d'alumine et de silice ont permis d'établir les faits suivants: 1La silice en solution dans la cryolithe est dissociée (probablement en Si4+ et O2-).2A 980° et avec une cathode de graphite, les tensions de décomposition sont resp. de 1,20 volt pour Al2O3 et de 0,95 volt pour SiO2.3Par électrolyse d'une solution cryolithique de SiO2 avec une cathode de Ni, on peut obtenir directement un alliage compact Ni—Si, dont la teneur en Si peut aller jusqu'à 25%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19570400706
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  • 10
    Electronic Resource
    Electronic Resource
    “Living” free radical polymerization of macromonomers: Preparation of well defined graft copolymers (1997)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 198 (1997), S. 155-166 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Well defined graft copolymers have been synthesized by a nitroxide-mediated “living” free radical process using pre-formed macromonomers. Analysis of the graft systems revealed that the macromonomer was efficiently incorporated into the polymeric backbone to give block copolymers of controlled molecular weight and narrow polydispersities. An added benefit of the “living” free radical process is that macromonomers, such as polylactide or polycaprolactone, which contain reactive functional groups can be used to form novel graft systems using this approach. Functionalized monomers or polymeric initiators were also used in the copolymerization mixture to give graft systems with a variety of functional groups attached to the backbone.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1997.021980112
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