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  • 1
    Electronic Resource
    Electronic Resource
    Tailored polymers by cationic ring-opening polymerization (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 223 (1994), S. 1-11 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: After a general classification of the cationic ring-opening polymerizations (CROP's) according to their polymerization mechanism, a number of examples of tailored polymers based on CROP are presented. The monomers used for the synthesis of these tailored structures are tetrahydrofuran (THF), N-tert-butyl aziridine (TBA), 2-methyl-1,3-oxazoline (MeOX) and 1,3-dioxolane (DXL).The polymer structures include different block and graft copolymers, macromonomers, star-shaped polymers, polymer networks and interpenetrating polymer networks (IPNs).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052230101
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  • 2
    Electronic Resource
    Electronic Resource
    The hard elasticity of polypropylene and its blends with polyethylene (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 27 (1989), S. 581-588 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Hard elastic monofilaments from polypropylene (PP) and its blends with polyethylene (PE) have been studied. Filaments with sharply different degrees of hard elasticity have been obtained by the same melt-spinning process from three types of PP resin with almost the same isotacticity, molecular weight, and melt index and from blends of one of the PP resin with PE or high-molecular weight PP (HMPP). With addition of a small amount of HDPE or HMPP to the parent PP resin, the hard elasticity of the filaments is increased significantly. Filaments with high hard elasticity can be prepared from PP resins of blends which show a relatively slow spherulitic growth rate. It is argued that the increased hard elasticity is due to row lamellae in PP fibers containing more adjacent folded chains and fewer tie molecules between lamellae and chain entanglements in the amorphous phase.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1989.090270307
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  • 3
    Electronic Resource
    Electronic Resource
    Bulk-to-surface diffusion measurements in a (111)Cu(0.1 at.%)Sn single crystal using a linear programmed heating method (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 22 (1994), S. 598-601 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Using the recently proposed method of linear heating, the diffusion parameters (D0 and E) were determined for a Cu(0.1 at.%)Sn single crystal. In this method, the sample temperature is increased linearly with time and the surface concentration is measured by Auger electron spectroscopy as a function of temperature (or time). The main advantage of this method is that the diffusion parameters may be obtained from a single run. Four runs were made at 0.1, 0.25, 0.5 and 1.0 °C s-1 and the average diffusion parameters (D0 = 9.2 × 10-4m2 s-1 and E = 189 kJ mol-1) agree well with other published values.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.7402201127
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  • 4
    Electronic Resource
    Electronic Resource
    Auger/LEED linear heating study of Sn and S bulk-to-surface diffusion in a Cu(111)(Sn, S) single crystal (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 23 (1995), S. 110-114 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The novel technique of linearly heating a sample to obtain both the pre-exponential factor D0 and the activation energy E from a single run is applied to the Cu(111)(Sn, S) system. Using Auger electron spectroscopy the surface enrichment is measured as a function of time (temperature) and fitted with an integral expression containing the fit parameters D0 and E. The fit values at all heating rates agree excellently with published, our own experimental and conventional t1/2 values after temperature corrections.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740230211
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  • 5
    Electronic Resource
    Electronic Resource
    Solid complexes of lithium perchlorate with cross-linked polymers of α-methacryloyl-ω-methoxypoly(oxyethylene)s. Conductivities and morphology (1985)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 6 (1985), S. 761-765 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1985.030061110
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  • 6
    Electronic Resource
    Electronic Resource
    Use of AES to determine sputter-induced concentration profiles in Cu-Ni alloys (1993)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 20 (1993), S. 95-98 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The difference in escape depth of Auger electrons of different energies was used to determine sputter-induced concentration profiles in Cu-Ni alloys. Alloys with Cu/Ni concentrations of 70/30, 50/50 and 30/70 at.% were bombarded with 2 keV Ar+ ions. After equilibrium has been reached, an AES spectrum for the alloy was recorded using a 12-bit analogue-to-digital converter interfaced with a computer. Spectra for the pure elements, Cu and Ni, were recorded under identical conditions and were used to generate Auger spectra for the alloys that could be compared with the experimental data. The layer concentration values for which the best fit was obtained were used to construct a concentration profile. The results indicate a Cu-enriched first layer followed by a depleted zone. It is concluded that the bombardment of Cu-Ni alloys by 2 keV Ar+ ions leads to the segregation of copper and that AES can be used to determine sputter-induced profiles if the necessary experimental precautions are taken.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740200114
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  • 7
    Electronic Resource
    Electronic Resource
    Reply to comment on ‘neglected and hidden errors in the quantification of Auger electron spectroscopy’ by J. du plessis (Surf. Interface Anal. 20, 228 (1993)) (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 21 (1994), S. 590-591 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740210814
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  • 8
    Electronic Resource
    Electronic Resource
    Hard elasticity of polyethylene formed by cold-drawing and annealing (1987)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 8 (1987), S. 539-542 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1987.030081105
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  • 9
    Electronic Resource
    Electronic Resource
    Radiation-induced copolymerization of isobutyl vinyl ether with trichloroethylene (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 2681-2690 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The radiation-induced copolymerization of isobutyl vinyl ether with trichloroethylene was investigated in the temperature range from -50°C to 100°C over a wide range of comonomer compositions. A copolymer was obtained in which the monomers alternate with regularity along the polymer chain over essentially the entire range of comonomer compositions. Both the rate of copolymerization and the number-average molecular weight of the resulting copolymer were found to depend strongly on the initial comonomer composition. The monomer reactivity ratios were determined and correspond well with calculated values. An apparent activation energy of 3.2 kcal/mole was obtained for the copolymerization process which exhibits a dose rate dependence of 0.72. The number-average molecular weight was found to be strongly dependent on the irradiation temperature, reaching a maximum value at 5°C.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170111020
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  • 10
    Electronic Resource
    Electronic Resource
    Radiation-induced ionic polymerization of isobutyl vinyl ether in bulk (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 2457-2466 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The radiation-induced ionic polymerization of isobutyl vinyl ether was investigated under conditions where the monomer was dried with molecular sieves. The investigation covered the temperature range from -16°C to 90°C, and the dose-rate range from 1015 to 1020 eV/g-sec, using both γ-rays and electrons. A very high overall activation energy of 15.9 kcal/mole was found for the process below 30°C. Above 30°C, however, the value of the overall activation energy dropped to 4.9 kcal/mole, a phenomenon which is ascribed to the solvation of the propagating carbonium ion below 30°C. The dose-rate dependence of the rate of polymerization was found to be 0.58 over the entire dose-rate range investigated. The molecular weight of the polymer was found to be far less sensitive to trace amounts of water than the rate of polymerization. The molecular weight of the polymer depended strongly on the irradiation temperature, reaching a maximum value of about 120,000 at 35°C. It is shown that at temperatures above 20°C regenerative chain transfer processes play an important role in determining the molecular weight of the polymer.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.170121101
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