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  • 2020-2023
  • 1985-1989  (3,443)
  • 1965-1969  (1,114)
  • 1945-1949  (87)
  • Chemistry  (4,644)
  • Industrial Chemistry
  • 1
    Electronic Resource
    Electronic Resource
    Properties of UV-curable polyurethane acrylates: Effect of reactive diluent (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 647-666 
    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: Several families of UV-cured polyurethane acrylates were synthesized, and the effects of reactive diluent type and content on their physical properties were investigated. Increasing reactive diluent content promoted the development of a second, high glass transition temperature phase in all the materials, thereby leading to increased strength and modulus. Changes in the extensibility of the samples upon addition of reactive diluent were inversely related to the effect of the diluent on the crosslink density. The effects of using different reactive diluents (di-, tri-, and tetraethylene glycol diacrylate and N-vinyl pyrrolidone) on the physical properties of the samples were attributed to differences in the softening point (Tg) of the homopolymer reactive diluents and the relative compatibility of the reactive diluents with the urethane acrylate segments.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300215
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of shock-thermal treatment on mechanical properties of steels (1989)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 14 (1989), S. 238-240 
    Details
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The shock-treatment permit to achieve high mechanical characteristics of steels. The interpretation of this effect is based on the possibility to change the carbon solubility in iron under these conditions. Measurements of the quality factors (internal friction in power-1) confirm this assumption.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prep.19890140604
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamic mechanical properties of thermoplastic elastomers from polypropylene-natural rubber blend (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 5509-5521 
    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: The dynamic mechanical properties of thermoplastic elastomers from polypropylene natural rubber blends have been evaluated with special reference to the effect of blend ratio and extent of dynamic crosslinking of the elastomer phase. The effects of HAF black and silica fillers have also been studied. It has been found that increasing the proportion of elastomer phase reduced the storage modulus and increased the loss tangent values of the blends. The effect of dynamic crosslinking was found to be more prominent in blends containing higher proportion of elastomer phase. The improvement in storage modulus and decrease in loss tangent values were quite remarkable with increase in extent of crosslinking in these blends. The 70:30 NR:PP blend was found to exist as a two-phase system, both the components forming continuous phases of the blend.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070320619
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  • 4
    Electronic Resource
    Electronic Resource
    Aqueous polymerization on clay surfaces. III. The polymerization of methyl methacrylate by montmorillonite/thiourea initiating system (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 27 (1989), S. 3977-3983 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Initiation of polymerization of methyl methacrylate with redox system montmorillonite (with lattice Fe3+)-thiourea has been achieved. The rates are dependent on both clay mineral and thiourea. Amidosulfenyl radicals are believed to initiate the polymerization on the clay surface. The polymerization produced nonextractable clay-polymer adduct up to an extent of 70 wt %. The pH of the medium (in the acidic range) did not affect the polymerization rate.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1989.080271209
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of fillers on the rheological behavior of thermoplastic 1,2 polybutadiene rubber (1988)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 28 (1988), S. 648-654 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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 influence of fillers like clay, silica, and carbon black on the rheological properties of 1,2 polybutadiene has been studied using a capillary rheometer. Silica filled compound exhibited the highest viscosity and clay filled compound the lowest viscosity at all shear rates. The effect of filler loading and temperature on the Theological behavior has also been studied. Smooth extrudates were obtained in most of the cases and die swell was lower for silica and carbon black filled compounds than for clay filled compounds. Rheograms of different 1,2 polybutadiene systems have been found to merge into a master curve using modified viscosity and shear rate functions that contain melt flow index as a parameter.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760281003
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  • 6
    Electronic Resource
    Electronic Resource
    Tests of a “free-volume” model of gas permeation through polymer membranes. II. Pure Ar, SF6, CF4, and C2H2F2 in polyethylene (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 2149-2166 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Permeability coefficients for Ar, SF6, CF4, and C2H2F2 (1,1-difluoroethylene) in polyethylene membranes were determined from steady-state permeation rates at temperatures from 5 to 50°C, and at applied gas pressures of up to 15 atm. The temperature and pressure dependence of the permeability coefficients was represented satisfactorily by an extension of Fujita's free volume model of diffusion of small molecules in polymers. The parameters required by this model were determined from independent absorption (diffusivity) measurements with the above gases in polyethylene rods. The present work confirms the results of previous studies with CO2, CH4 C2H4 and C3H8 in polyethylene.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090241001
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  • 7
    Electronic Resource
    Electronic Resource
    A study on graft copolymerization of methyl methacrylate onto jute fiberCorrected proofs received January 21, 1985 (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 1399-1406 
    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: A kinetic study of the graft copolymerization of methyl methacrylate onto jute fiber using KMnO4-malonic acid redox initiator system has been made. Effects of the concentrations of malonic acid, monomer, and KMnO4 on graft yield have been studied. Besides, the effects of temperature, acid, and reaction medium, some inorganic salts on graft yield have been investigated. The most remarkable features of the investigation include the proposition of a mechanism, derivation of rate expression for the grafting process, and characterization of the grafted fiber by thermogravimetric analysis.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300407
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  • 8
    Electronic Resource
    Electronic Resource
    Complexes of metal ions with phosphorus or arsenic containing ligands. I. Complexes of Orthocarboxyphenyl Tertiary Arsines with zinc(II) and cadmium(II) (1968)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 363 (1968), S. 207-212 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden Zn- und Cd-Komplexe mit den Liganden o-Carboxyphenyl-dimethylarsin, o-Carboxyphenyl-diphenylarsin und o-Carboxyphenyl-di(p-tolyl)-arsin dargestellt. Cd ergibt mit allen drei Liganden polymere, offenbar oktaedrische Komplexe der allgemeinen Zusammensetzung M(OOC·C6H4·AsR2)2, während dies beim Zink nur bei den beiden beiden letzteren Liganden der Fall ist. Mit dem Dimethylarsin bildet Zink einen Komplex Zn(OOC·C6H4)·AsMe2·Me2As·C6 H4COOH mit Fünferkoordination.
    Notes: The complexes of zinc(II) and cadmium(II) have been prepared with the ligands o-carboxyphenyldimethylarsine, o-carboxyphenyldiphenylarsine and o-carboxyphenyldi(p-tolyl) arsine. The complexes of cadmium(II) with all the ligands and that of zinc(II) with the latter two have been assigned the general formula M(OOC·C6H4·AsR2)2 and appear to be octahedral due to their polymeric nature. Zinc(II) forms complex, Zn(OOC·C6H4·AsMe2)2·Me2 As·C6H4COOH, with the first ligand which is pentacoordinated.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19683630315
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  • 9
    Electronic Resource
    Electronic Resource
    Molecular weight distribution and conformational analysis of randomly branched poly(phenylene quinoxalines) of low branching degree (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 22-29 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch vergleichende Untersuchungen an verdünnten Lösungen von statistisch verzweigten Polyphenylchinoxalinen (PPC) mit niedrigem Verzweigungsgrad und von linearen PPC wird gefunden, daß die hydrodynamischen Eigenschaften und der Polydispersitätskoeffizient selbst auf sehr niedrige Verzweigungsgrade empfindlich ansprechen. Die Konformation verzweigter PPC in Lösung zeigt Abweichungen vom statistischen Gaussschen Knäuel. Die Molmassenverteilung der verzweigten PPC weist keine Übereinstimmung zwischen theoretischen und experimentell ermittelten Werten auf. Mögliche Ursachen für die fehlende Übereinstimmung werden diskutiert.
    Notes: By comparative investigations of solutions of randomly branched poly(phenylene quinoxalines) (PPQ) with low degree of branching and solutions of linear PPQ the hydrodynamic properties and polydispersity coefficient are shown to be sensitively affected by branching. The conformation of branched PPQ macromolecules in solution was found to deviate from Gaussian type. Additionally, differences between experimental and theoretical MWD were detected. Possible explanations of the observed desagreement are discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1985.010360105
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  • 10
    Electronic Resource
    Electronic Resource
    Resonance Raman spectrum of phenolphthalein in alkaline solution and vibrational spectra of the pure compound and its potassium salts (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 20 (1989), S. 651-654 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman and infrared spectra of phenolphthalein and its white and pink potassium salts together with the resonance Raman spectrum of the parent compound in alkaline solution were studied. From careful comparison of the spectra, the observed frequencies were assigned to appropriate vibrational modes and from these assignments frequencies originating from vibrations of hybridized bonds in the resonating molecular forms of phenolphthalein, believed to be present in alkaline solution were identified. It was shown that such resonating forms are present in the pink but not the white potassium salt. The spectral data also indicate that the vibrations of the carboxylate ion group do not take part in the resonance Raman phenomenon.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250201004
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