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  • Elsevier  (236)
  • Wiley-Blackwell  (84)
  • 1990-1994  (320)
  • 1975-1979
  • 1990  (320)
  • 1
    Electronic Resource
    Electronic Resource
    Negligible kinetic solvent interactions for the rate of photobromination of toluenes where the bromine atom is a principal chain carrierDedicated to Professor Ikchoon Lee on the occasion of his 60th birthday. Preliminary results of this work have been presented earlier. (1990)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 3 (1990), S. 803-806 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The bromine atom is a major chain carrier in the photobromination of toluenes by N-bromosuccinimide. Only an uncomplexed bromine atom can abstract hydrogen atoms from toluenes. The nature of the polar transition state is entirely different from that of solvolytic reactions and the solvent polarity therefore cannot infuence the rates of the bromination.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610031206
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  • 2
    Electronic Resource
    Electronic Resource
    Binary blends of nylons with ethylene vinyl alcohol copolymers: Morphological, thermal, rheological, and mechanical behavior (1990)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 341-349 
    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: Binary blends of ethylene vinyl alcohol copolymers, containing 62 (EVOH-62) and 71 (EVOH-71) mole percent vinyl alcohols, with nylons (nylon-6, nylon-6/12, and nylon-12) have been prepared from melt mixing in a twin screw compounding machine. Morphological, thermal, rheological, and mechanical properties were determined. EVOH-62/nylon-6 and EVOH-71/nylon-6 blends showed homogeneous phase morphologies in the nylon-6-rich region, and fine phase separations (c.a. 2 × 10-7 m) in the EVOH-rich region. Melting point depression, positive deviations in viscosity and flexural modulus, and negative deviation in impact strength from the simple additive rule were generally observed. And the results were possibly interpreted in terms of compatibility and increased nylon/EVOH interactions over the nylon/nylon interactions. On the contrary, clean phase separations in large domains were observed from EVOH-71/nylon-6/12 and EVOH-71 /nylon-12 blends. Fibrillation was also obtained from EVOH rich blends. Probably due to the incompatible nature of these blends, yield at low rate of shear and a mechanical property drop were also observed.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760300605
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence for formation of 2-nitrobenzoylperoxy radical generated from 2-nitrobenzoyl chloride and superoxide: Spin trapping of the peroxyradical intermediate and its oxidizing abilities (1990)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 3 (1990), S. 482-484 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 2-Nitrobenzoyl chlorde was reacted with superoxide in acetonitrile to form 1 2-nitrobenzoylperoxy radical intermediate which showed a stronger oxidizing ability than that from superoxide, as confirmed by ESR spin trapping studies.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610030711
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  • 4
    Electronic Resource
    Electronic Resource
    Curing and phase separation behavior of amine terminated butadiene acrylonitrile copolymer (ATBN) modified epoxy (1990)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 1 (1990), S. 211-217 
    Details
    ISSN: 1042-7147
    Keywords: Phase separation ; Curing ; Vitrification ; Light scattering ; ATBN ; 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
    Notes: The vitrification effect during the curing reaction of amine terminated butadiene acrylonitrile copolymer-(ATBN)-modified epoxy resin is studied by the differential scanning calorimetry. A new reaction kinetic equation is derived to describe the effect of vitrification on the reaction rate at both glassy and rubbery state of reactants. ATBN is added to improve the impact properties of the cured epoxy resin. The phase separation behavior during the curing reaction is analyzed by the light scattering and turbidity experiments. From the results of the cloud point measurements, it is observed that the ATBN-epoxy system showed upper critical solution temperature (UCST) behavior. From the results of the light scattering experiments, the domain correlation length increases as the content of ATBN increases.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1990.220010304
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  • 5
    Electronic Resource
    Electronic Resource
    Collisionally-activated dissociation of methane molecular ion. Analysis of a mass-analysed ion kinetic energy peak shape (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 327-334 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Collisionally-activated dissociation (CAD) of methane molecular ion to methyl ion is studied in the kiloelectronvolt collision energy region by mass-analysed ion kinetic energy (MIKE) spectrometry. The CAD-MIKE peak shape was deconvoluted using the algorithm developed previously. The kinetic energy release distribution evaluated from the deconvoluted peak shape exhibits a bimodal feature. This is attributed to the participation of two different mechanisms for collisional activation, leading to electronic and vibrational excitations, respectively.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290040907
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  • 6
    Electronic Resource
    Electronic Resource
    Gas transport in polyurethane-polystyrene interpenetrating polymer network membranes (1990)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 1 (1990), S. 231-238 
    Details
    ISSN: 1042-7147
    Keywords: IPN membrane ; Low temperature Synthesis ; Miscibility control ; Gas permeability ; Free volume ; 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
    Notes: The gas (oxygen and nitrogen) transport characteristics of the IPN membranes of polyurethane/polysturene were studied. The effect of synthesis temperature, composition, and crosslink density of the IPN membranes were analyzed. Polyurethane was prepared thermally and polystyrene was prepared by photolytic polymerization methods at various temperatures. The degree of intermixing between component polymers in the IPN membrane increased with decreasing synthesis temperature from 50°C to -10°C. The PS phase Tg was shifted inwardly up to 12°C. The permeability coefficient decreased and ideal separation factor increased also with decreasing the synthesis temperature due to the increase of miscibility. The permeability coefficient of oxygen and nitrogen ranged in the 10-10 and 10-10 order of magnitude. The permeability coefficient showed the minimum value and the ideal separation factor showed the maximum value at about 40 wt% polyrethane composition. The permeability data agreed well with the simple free volume model proposed by Lee [18].
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1990.220010307
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of compatibilizer on the crystallization kinetics and mechanical properties of nylon 6/LDPE blends (1990)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 1 (1990), S. 325-334 
    Details
    ISSN: 1042-7147
    Keywords: Compatibilizer ; Crystallization kinetics ; Impact strength ; Nylon 6/LDPE blends ; Morphology ; 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
    Notes: The crystallization kinetics of Nylon 6 (PA) in PA/low-density polyethylene (LDPE) blends were studied by differential scanning calorimeter (DSC). The effects of crystallization temperature, blend ratio, and compatibilizer (MOD) on the crystallization kinetics were evaluated by the modified Avrami equation, and the effect of compatibilizer on the mechanical properties of PA/LDPE blends were also investigated.(1)In PA/LDPE blends, the crystallization rate increased with decreasing crystallization temperature in the crystallization temperature range between 181°C and 190°C.(2)In PA/LDPE blends, the introduction of LDPE into PA resulted in an increase in the crystallization rate, while in PA/LDPE/MOD blends the introduction of MOD into the PA/LDPE blend resulted in a decrease in the crystallization rate, which resulted from the partial intermixing of LDPE and MOD in the blends.(3)In PA/LDPE blends, the Avrami exponents were found to be in the neighborhood of three of four over the crystallization temperature range between 181°C and 190°C, almost independent of the composition, while in PA/LDPE/MOD blends, the Avrami exponents showed lower values. In the light of these results and morphological features, it is suggested that for PA/LDPE blends, the crystallization proceeds by athermal nucleation followed by a three dimensional growth, while for PA/LDPE/MOD blends there is a transition from spherulitic growth to somewhat fibrillar growth.(4)PA/LDPE/MOD(80/20/20) blends show a five times higher impact property, with a good balance of tensile properties, than the PA homopolymer.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1990.220010507
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  • 8
    Electronic Resource
    Electronic Resource
    Kinetic study of ethylene polymerization by highly active silica supported TiCL4/MgCl2 catalysts (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 837-854 
    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 kinetics of ethylene polymerization with TiCl4/MgCl2/SiO2 has been investigated in the range of temperatures between 40 and 90°C and in the range of ethylene pressures between 4 and 12.4 kg/cm2. The role of MgCl2 was discussed from the dependence of the Mg/Ti ratio on the catalytic activity. The polymerzation rate was first order with respect to the monomer concentration and the dependence of the polymerization rate on the concentration of Al(C2H5)3 could be described by the Langmuir-Hinshelwood mechanism. The dependence of initial rate and the time to reach the maximum polymerization rate on the concentration of Al(C2H5)3 was also discussed. Polymerization rates as a function of the polymerization temperature showed a maximum and the activation energy was 11.8 kcal/mol between 50 and 80°C. The polymerization rate decreased with the increase of hydrogen partial pressure. The active site concentration (C*) was 1.9 × 10-2 mol/mol Ti by the inhibition method with carbon monoxide.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390406
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  • 9
    Electronic Resource
    Electronic Resource
    Adsorption and reaction of 4-methoxycinnamonitrile on a silver surface: A surface-enhanced Raman spectroscopic study (1990)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 21 (1990), S. 743-749 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Surface-enhanced Raman scattering of cis- and trans-4-methoxycinnamonitrile (4MCN) was investigated in aqueous silver sols. Both isomers adsorbed on the silver surface via the cyano group. The adsorption strength for the cis isomer appeared to be greater than that for the trans isomer. However, cis-4MCN, adsorbed selectively on the silver surface, was readily converted to the trans isomer via a laser-assisted surface reaction. The exact mechanism of the photoisomerization is not yet completely understood. It is thought that the reaction occurs via the absorption of a single visible photon which is in resonance with the low-energy tail of the broadened absorption band of the adsorbed cis isomer.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250211107
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  • 10
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    Hybrid emulsion spectrometer for the detection of hadronically produced heavy flavor states (1990)
    Elsevier
    Details
    Publication Date: 1990-04-01
    Print ISSN: 0168-9002
    Electronic ISSN: 1872-9576
    Topics: Physics
    Published by Elsevier
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