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  • 1
    Electronic Resource
    Electronic Resource
    Liquid crystalline oligomeric and polymeric phthalocyanines (1995)
    Weinheim : Wiley-Blackwell
    Advanced Materials 7 (1995), S. 877-880 
    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: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19950071015
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  • 2
    Electronic Resource
    Electronic Resource
    High speed puncture testing of thermoplastics (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 101-110 
    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 extensive study has been made of a broad range of polymeric materials, by the instrumented high speed puncture method. The range of strain rates prevalent in these tests has been related to the strain rates in parts subjected to normal abuse. It has been further demonstrated that at some critical test speed each material exhibited a load maximum which is accompanied by a change in the mode of failure and loss of ductility. This “critical speed” has been shown to be characteristic of the material under test.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080107
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  • 3
    Electronic Resource
    Electronic Resource
    Computer simulation of polymeric materials. I. Stress-strain behavior (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 1337-1347 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A model of polymeric materials has been developed that includes many of the features of condensed-phase polymer chain dynamics, central among them chain relaxation via conformational motion. The model consists of a number of chains of particles that are connected by bonds with multiwelled potentials to approximate the energetics of conformational motion. Interactions between particles on adjacent chains are modeled by short range repulsive potentials. We have examined the stress-strain behavior of the model using molecular dynamics simulations and find qualitative agreement with the observed experimental behavior of polymeric materials.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1988.090260701
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  • 4
    Electronic Resource
    Electronic Resource
    Energy storage in polymer chains under stress (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 1349-1359 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The local conformation and storage of energy in individual polymer chains during a deformation of a bulk polymer sample are examined by the computer simulation of a relatively simple model. It is shown that as the interaction between the chain atoms and surrounding medium increases, rotational angle motion is suppressed during the deformation, and large amounts of energy are stored in backbone bond angle and bond length distortions. The relationship of this phenomena to Tg and the implications for chain relaxation are discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1988.090260702
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of structure on polymerizability: Olefin polysulfone formation (1958)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 29 (1958), S. 549-556 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymerizability in the thermodynamic sense is measured by the free energy of polymerization. The effect of structure on polymerizability can be measured in two ways: (1) we may compare standard free energies (which are directly related to equilibrium monomer concentrations) at a given temperature; or (2) we may compare the temperatures at which the actual free energy changes are zero for a chosen monomer concentration. These temperatures are termed “ceiling temperatures” Tc and have been determined for the 1:1 copolymerization of sulfur dioxide S. with a wide variety of unsaturated compounds M, under the standard conditions [M] [S] = 27 mole2.1-2(binary mixture, mole fraction of M approximately 0.09). The polymers have the general formula Tc was determined by extrapolating the photochemical rate-temperature relation to zero rate. In the straight chain 1-olefin series Tc falls from ethylene (gt;135°) to propylene 90°, to butene-1 64°, and thereafter remains approximately constant with increasing chain length. With 2-olefins there is a progressive decrease from butene 34°, to pentene 8°, to heptene -38°. Branching invariably lowers Tc and the effect is greatest when the branching is at the double bond: thus isobutene 4°, 3-methylbutene-1 36°, 4,4-dimethylpentene-1 14°. 2-Ethyl substitution of a 1-olefin, or 2, 3 or 4 substitution of a 2-olefin results in inability to react at any temperature down to -80°. Cyclic olefins have Tc considerably higher than the corresponding 2-olefins: cyclopentene 102°, cyclohexene 24°. A number of allyl compounds have also been investigated. Tc is related to the heat and entropy of polymerization by the relation Tc = Delta;H/ΔS and in eight cases values of ΔH and ΔS have been obtained. A change of structure mainly affects ΔH. Estimated equilibrium monomer concentrations in polysulfone formation and in vinyl polymerization at 25°C. are summarized.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1958.1202912019
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  • 6
    Electronic Resource
    Electronic Resource
    Poly(2-ethyl-2-n-butyl trimethylene sulfone) (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 3001-3002 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170161126
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  • 7
    Electronic Resource
    Electronic Resource
    Energy transfer processes involving ultraviolet stabilizers. Quenching of singlet oxygen (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 1927-1937 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The role of electronically excited singlet (1Δg) oxygen molecules in the photooxidation of polymers has received increased attention in recent years. Little information regarding the interaction of ultraviolet stabilizers with singlet oxygen is known, however. In this study, singlet oxygen was produced by a microwave discharge in a flow system and rate constants were obtained for quenching by ultraviolet stabilizers. It was found that some nickel chelate stabilizers are effective quenchers of singlet oxygen and their quenching behaviors can be correlated with ultraviolet stabilization effectiveness in thin polypropylene and polyethylene films. The best oxygen quenchers of those examined are nickel chelates with sulfur donor ligands.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170110814
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  • 8
    Electronic Resource
    Electronic Resource
    Melt flow index values and molecular weight distributions of commercial thermoplastics (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 41 (1990), S. 1617-1627 
    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 traditional melt index test (ASTM D 1238) is widely used in the plastics industry to characterize polymer processability. The data from this measurement must be interpreted cautiously, however, because polymers are usually processed under conditions that are far removed from those of the melt index test. In this study, melt index (MI) values from a series of polystyrene, polypropylene, linear low-density polyethylenes (butene and octene copolymers), and high-density polyethylenes were measured and related to molecular weight distributions of these materials. It was found that a simple relationship between 1/MI versus M̄xw (where x = 3.4-3.7) was followed for the linear polymers with similar polydispersities. For branched polymers, the best correlation was that of -ln(MI) versus ln(M̄v). A general relation for shear modifiable polymers like polyethylenes cannot be obtained unless the rheological state of the material can also be defined.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070410721
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  • 9
    Electronic Resource
    Electronic Resource
    Characterization of linear low density polyethylene by temperature rising elution fractionation and by differential scanning calorimetry (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 425-434 
    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: In this article we consider characterization of the branching distribution of LLDPE by analytical TREF and by DSC techniques. Qualitatively, both methods yield parallel information, provided that the DSC samples are prepared at very slow cooling rates. Analytical TREF provides more quantitative information, however, in that the mass fraction of material with different branch levels can be estimated. Full characterization of a polyethylene requires the use of a preparative TREF technique, in which fractions dissolved at preselected temperatures are investigated for branching with high resolution 13C NMR and for molecular weight distribution, with high temperature SEC analyses.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070440307
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  • 10
    Electronic Resource
    Electronic Resource
    Fungal degradation of polycaprolactones (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 327-334 
    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: Three high molecular weight polycaprolactones (M̄w = 35,000, 18,600, and 7,130) were utilized as the sole carbon source by five of six fungi tested by the American Standards for Testing and Materials (ASTM) agar plate method. The fungi were Aspergillus flavus, A. niger, A. fumigatus, Chaetomium globosum, Pencillium funiculosum, and a Fusarium sp. Quantitative analysis of degradation was performed using gel permeation chromatography (GPC). GPC analysis demonstrated differences between the activities of organisms which appeared similar by the ASTM method, and showed that, while all molecular weight species within each polymer were hydrolyzed, in several cases low molecular weight end products were not assimilated. Depending on the organism, the dominant factor determining degradability was either polymer molecular weight or degree of crystallinity.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1983.070280128
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