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  • Physics  (17)
  • Wiley-Blackwell  (17)
  • American Institute of Physics
  • International Union of Crystallography (IUCr)
  • 1995-1999
  • 1975-1979  (17)
  • 1978  (17)
  • 1
    Electronic Resource
    Electronic Resource
    Vinyl polymerization by metal complexes. XXV. Photopolymerization of vinyl monomers by porphyrin-iron(III) complexFor Part XXIV see Inaki et al. (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 399-406 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photopolymerization of methyl methacrylate was studied in the presence of the system of the tetraphenylporphine-iron(III) complex, free amine, and carbon tetrachloride at 0°C in methanol solution. It was found that the activity of the complex for polymerization does not depend upon the structure of the free amines added. The effect of the polymeric amines on the polymerization was also examined. The photochemical reaction process among the iron(III) complex, amine, and carbon tetrachloride was followed also under similar conditions by ultraviolet and visible spectroscopy. The scheme for the initiation species presented is supported by the results on the posteffect of the photopolymerization.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160210
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanical property studies of poly(ethylene terephthalate) crystallized by nonreactive liquids (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 1545-1557 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The mechanical properties of initially amorphous, unoriented poly(ethylene terephthalate) (PET) films crystallized in acetone and dioxane at room temperature were studied under tensile testing conditions. It was found that the nature of the liquid, the morphology it induced, and its significant residual level trapped within the PET following this type of crystallization all influenced the observed mechanical behavior. Further, thermally treating PET at 70, 90, and 174°C prior to the liquid treatments appeared to inhibit the effects of the liquids on the resultant mechanical behavior. Finally, because these liquids penetrated the polymer as distinct fronts, laminate-type structures were generated in the films. It then was shown that an ideal parallel element laminate could adequately model the mechanical behavior of the films.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160903
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  • 3
    Electronic Resource
    Electronic Resource
    Solubility of nitrogen and ethylene in molten, low-density polyethylene to 69 atmospheres (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 319-333 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Statistical mechanical correlations of ethylene and nitrogen solubility in molten, low-density polyethylene at several temperatures and at pressures to 69 atm are presented. The solubilities are taken from data previously published by us and by other workers. The data are modeled with a corresponding-states solution analysis applicable to mixtures of high-and low-density fluids. The model is based on a simple variation of the Flory and Prigogine corresponding-states theories. Gas sorption data are modeled well within experimental precision.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160211
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal properties of some hydrogenated poly(α-methyl styrenes) (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 1389-1397 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Synthesis of poly(isopropenyl cyclohexane) via the hydrogenation of poly(α-methyl styrene) is described. Depending on the reaction time and catalyst system a homopolymer or a copolymer is obtained. Under the conditions of synthesis both materials are highly syndiotactic. For the pure hydrogenated homopolymer (〉99.9%) the glass transition temperature was found to be 185.4°C, about 20°C above Tg of poly(α-ethyl styrene). Contrary to expectations, the glass transitions of the 92/8, 33/67 poly(isopropenyl cyclohexane-co-methyl styrene) and poly(α-methyl styrene) are almost identical, as are the decomposition temperature ranges. Thermal data indicate that the decomposition mechanism of the copolymers and hydrogenated homopolymer is random scission. The thermogravimetric curves also indicate that the copolymers are random. Thus, chain stiffness appears not to increase rapidly with hydrogenation of this highly syndiotactic polymer.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160805
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  • 5
    Electronic Resource
    Electronic Resource
    Vapor sorption isotherms for benzene and n-hepatane with poly(styrene-co-butadiene) (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 117-120 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Vapor sorption measurements of Flory-Huggins interaction parameters χ for three poly(styrene-co-butadiene) + solvent systems at 25°C are reported. For Philprene 1502 + benzene: χ = 0.379-0.297 v22; for Philprene 1502 + n-heptane: χ = 0.595 + 0.030 v2 for Solprene 1204 + benzene: χ = 0.516-0.026 v2. The volume for fractions of polymer v2 range from ca. 0.4 to 0.9.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160110
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  • 6
    Electronic Resource
    Electronic Resource
    Volume dependence of the elastic equation of state (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 121-130 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The elastic component of the solvent chemical potential in isotropically swollen polymer networks is investigated as a function of the degree of dilation. The experimental method is similar to one employed by Gee, Herbert, and Roberts; the differential solvent vapor sorption by crosslinked and uncrosslinked polymers is measured as a function of solvent activity. Three systems have been investigated: poly(dimethylsiloxane) + benzene, poly(styrene-co-butadiene) + benzene, and poly(styrene-co-butadiene) + n-heptane. The same vulcanizate was used for the latter two series of measurements. The qualitative behavior found for all three systems is in general agreement with the results of Gee et al. on natural rubber + benzene. The data suggest that the elastic and mixing free energies are not separable.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160111
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of pressure and chemical structure on the thermal conductivity of vitreous poly(alkyl methacrylates). II. Relation to free volume (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 689-694 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A quantitative model for the pressure dependence of the thermal conductivity K in glassy polymers is presented. By extending the hole theory of liquids to temperatures below the glass transition temperature, an equation of state is obtained and an expression for the pressure dependence of the thermal conductivity is then formulated from a consideration of the anharmonicity associated with the segmental vibrations. The resulting equation ΔK/K = γGf0[1-exp(-p/B*)], where γG is the Grüneisen parameter, f0 is the fractional free volume, and B* = kTg/V0, is compared with experimental results for the poly(alkyl methacrylates).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160410
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of rubber-toughened plastics by scanning electron microscopy (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 1321-1323 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160713
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  • 9
    Electronic Resource
    Electronic Resource
    Free-radical polymerization of phenylacetylene (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 407-414 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The free-radical polymerization of phenylacetylene initiated by azobisisobutyronitrile at 50°C was studied in bulk and in the presence of benzene and toluene. The polymerization rate is approximately first-order with respect to the initiator concentration. The number-average molecular weight of the polymer is independent of the initiator concentration in bulk and is approximately proportional to the monomer concentration in the presence of the two diluents, but independent of their nature. The data are consistent with a mechanism based on first-order decay of active to inactive radicals. This step appears to exert the major control over kinetic and molecular chain lengths. Chain transfer to the monomer is concluded to be absent or to make only a small contribution to molecular termination.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160211
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  • 10
    Electronic Resource
    Electronic Resource
    Pulse radiolysis study on the initial processes of radiation-induced cationic polymerization of styrene and α-methylstyrene (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 729-741 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Initial processes of radiation-induced cationic polymerization of styrene and α-methylstyrene have been studied by means of microsecond pulse radiolysis. For styrene, absorption bands caused by the monomer cation radical St+• appear at 630 and 350 nm in a mixture of isopentane and n-butyl chloride at about -165°C. In parallel with the decay of St+•, three absorption bands appear in the near-infrared (IR) region, and at 600 and 450 nm. The IR and 600 nm bands are assigned to the associated dimer cation radical St2+•, and the 450 nm band to the bonded dimer cation radical St-St+•. The kinetic behavior of these species shows that reaction of St+• with styrene monomer forms both St2+• and St-St+•. With the decay of St-St+•, another absorption band appears at 340 nm, and the lifetime of this band is relatively long. The 340 nm band may be due to carbonium ions of the growing polystyrene. For α-methylstyrene, the monomer cation radical (at 690 and 350 nm), the associated dimer cation radical (in the near-IR region and at 620 nm) and the bonded dimer cation radical (at 480 nm) behave in a manner similar to that of the corresponding styrene species. The absorption band caused by carbonium ions of growing poly(α-methylstyrene) appears at 340 nm.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160402
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