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  • Polymer and Materials Science  (85)
  • MASERS  (31)
  • ASTROPHYSICS
  • STRUCTURAL MECHANICS
  • 1970-1974
  • 1960-1964  (131)
  • 1963  (131)
Collection
Publisher
Years
  • 1970-1974
  • 1960-1964  (131)
Year
  • 11
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. S15 
    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
    Additional Material: 1 Ill.
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  • 12
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 13
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effect of magnesium ion binding on the dissociation of side chain carboxyl group in α-poly-L-glutamic acid has been measured by a modified titration technique involving pretitration of the polyacid with a strong base of a weakly bound counterion followed by addition of aliquots of the neutral salt of the more strongly bound counterion, magnesium chloride. The changes in the ionization of the carboxylic acid groups in the poly-L-glutamic acid side chains have been measured as a function of both the degree of preionization and of the concentration of magnesium chloride added. These changes have been related to changes in the polymer configuration (helix-coil transition) as a function of degree of pre-ionization. The effects of ionic strength and of ion binding have been determined by a comparison of tetramethyl ammonium chloride and of magnesium chloride at the same ionic strength. The plot proposed by Wada has been used to determine the pure helical region, the region of helix-coil transition, and the pure coil region with both magnesium chloride and tetramethyl ammonium chloride as added salts. At the same ionic strength the effects produced by magnesium chloride addition are far greater than for tetramethyl ammonium chloride. Magnesium chloride at an ionic strength of 0.25 × 10-4 produces an effect equivalent to that of tetramethyl ammonium at an ionic strength of 15.0 × 10-4. This effect is also apparent when the concentration of carboxyl groups ionized by magnesium chloride addition is determined. The much larger effects produced by the magnesium ion are attributed to the enhanced binding of this ion. The results reported indicate binding is favored in the helical configuration. The binding in the random coil configuration is similar to that reported previously for other randomly coiled polyelectrolytes.
    Additional Material: 3 Ill.
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  • 14
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 1 (1963), S. 231-238 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies of different preparations of ribonuclease A by thin film dialysis and countercurrent distribution have shown the existence of conformational isomers. These forms are slowly interconvertible in a particular solvent environment. They show the minimum molecular weight of ribonuclease and do not differ enzymatically or by rotatory dispersion.
    Additional Material: 3 Ill.
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  • 15
    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 convenient method of preparing zinc ethylenediamine complex (ZED) solution for use as solvent for cellulose pulp is described, and the advantages in using this solvent (0.25M zinc in 41% ethylenediamine in water) over cupriethylenediamine (CED) or cuprammonium solutions for viscometric determination of molecular weight of cellulose are indicated. Intrinsic viscosities of eight rayon-grade pulp solutions have been determined at four temperatures: 15, 20, 25, and 30°C. The constants K = 5.85 × 10-5 and a = 0.936 of the Mark-Houwink equation [η] = KMna, required for evaluating the molecular weight of cellulose pulps in ZED solution, have been determined by using the molecular weight values obtained from CED solutions.
    Additional Material: 3 Ill.
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  • 16
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 357-374 
    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 modification of cellulose (cotton fabric or yarn) has been carried out with acrylonitrile under ionizing radiation. Irradiation of the cotton in aqueous acrylonitrile solutions with gamma- or electron radiation produces a modified cotton with improved rot and mildew resistance similar to that of cyanoethylated cotton. Strength properties are not significantly affected, provided the radiation dose is less than 5 Mrads. The pickup of acrylonitrile by cotton depends on monomer concentration, dose, and dose rate. It was also observed that water was necessary to give the desired uniform modification. Doses of 0.5-1.5 Mrads produced modifications in the range of 8-15%. Dose rate effects are present at low doses, where pickup decreases with increasing dose rate. Above 5 Mrads, dose rate effects are minimized. Although the data do not show whether actual grafting is occurring with the cellulose, either directly from radiation or through oxidative products formed in the water, or whether the cellulose is being swollen with the aqueous monomer solution which is then intimately polymerized by radiation fragments resulting from the radiation, it is apparent that polymer is formed uniformly upon or within the cellulose structure and that it cannot be removed by solvent extraction. As a result of the modification, the solubility of the cellulose in its usual solvents is decreased and other properties are modified, especially rot resistance, which is improved. Modification of cotton with monomers other than acrylonitrile has also been considered. Pickups of styrene, acrylic acid, methyl isopropenyl ketone, ethyl acrylate, and methyl methacrylate have been obtained from methanol-water solutions.
    Additional Material: 5 Ill.
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  • 17
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 451-459 
    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 reactivity ratios in the copolymerizations of N-tert-octyl acrylamide, N-n-octyl acrylamide, and N,N-di-n-butyl acrylamide with styrene and methyl methacrylate have been determined, and the Alfrey-Price Q and e values calculated. The distributed monomer N,N-di-n-butyl acrylamide was found to be more reactive than either N-n-octyl or N-tert-octyl acrylamide, which were of about the same reactivity.
    Additional Material: 6 Ill.
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  • 18
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 475-491 
    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 the present paper different views concerning polymer-to-polymer adhesion were considered and the theory suggested whereby adhesion of high polymers as well as autohesion is reduced to diffusion of chain molecules or their segments and to the formation of a sturdy bond between the adhesive and the adherend as a result. From the viewpoint of the suggested theory the influence of such factors as the duration of contact between the adhesive and the adherend, contact temperature, molecular weight of the adhesive, shape and polarity of macromolecules, and phase state of polymers was considered and explained.
    Additional Material: 5 Ill.
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  • 19
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 971-992 
    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 complex elastic modulus G*(ω) = iG′(ω) + iG′(ω) is shown to be a function not only of the frequency (ω) but also of the damping factor a if the strain is of the form x = x0 exp {- at} sin ωt. The general equations for G*(ω,a) = G′(ω,a) + iG″ (ω,a) = are derived in terms of the relaxation spectrum. The use of a spring to aid the specimen and reduce the ratio a/ω is discussed, and its desirability demonstrated. If data are thus available in terms of either G″(ω) or G″(ω,a) the iterated second approximation of Ninomiya and Ferry provides a rapid and powerful method of finding the relaxation spectrum. To the accuracy to which the time-temperature reduction factor aT is known or can be predicted by means such, for example, as the WLF equation, the function G″(ω,a) over a temperature range at nearly constant frequency can be translated into terms of G″(ω,a) at constant temperature and varying frequency. In such cases, the relatively simple torsional pendulum, or some analogue of it, can economically provide a characterization of the viscoelastic behavior of the material over an extended time or frequency range.
    Additional Material: 14 Ill.
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  • 20
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 1515-1521 
    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: Methacrylylacetylacetone and acrylylacetylacetone were prepared by acylation of acetylacetone enolate salts with methacrylyl chloride and acrylyl chloride, respectively. Both monomers yielded poor homopolymers. Methacrylylacetylacetone formed copolymers with styrene and methyl methacrylate without difficulty.
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