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  • Polymer and Materials Science  (128)
  • 1995-1999
  • 1970-1974
  • 1965-1969  (128)
  • 1935-1939
  • 1965  (128)
Collection
Keywords
Publisher
Years
  • 1995-1999
  • 1970-1974
  • 1965-1969  (128)
  • 1935-1939
Year
  • 1
    Electronic Resource
    Electronic Resource
    Endgroup modification of unsaturated polyesters. Effect on chemical resistance (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 1681-1700 
    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: Endgroups of unsaturated polyesters formulated with mole ratios of 2/1/3 and 1/1/2 isophthalic acid/maleic anhydride/propylene glycol were modified. Carboxylic acid content was effectively reduced by esterification with alcohols or epoxides, amidation with phenyl isocyanate, or neutralization with amines. Hydroxyl content was reduced by esterification with acids or anhydrides and urethane formation with phenyl isocyanate. Chemical resistance was determined by measuring the decrease in flexural strength and modulus with exposure to 10% solutions of sodium hydroxide and sulfuric acid at 82°C. A 2-week test using the medium chemical-resistant 2/1/3 polyester indicated that any modification which decreased the carboxylic acid content improved chemical resistance. Modifications which increased or decreased the hydroxyl content had no significant effect in the 2-week tests; however, decrease of hydroxyl content appeared important in 6-month exposure tests. The 1/1/2 resins which have high initial chemical resistance had poorer chemical resistance after endgroup modification than the unmodified 1/1/2 resin, with the exception of the phenyl isocyanate-modified product which was equal to the unmodified resin. Water (0.8%) and xylene (0.1%) had no effect on chemical resistance. However, larger amounts of residual solvent were disadvantageous.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090507
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  • 2
    Electronic Resource
    Electronic Resource
    Organotin polyesters (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 3383-3388 
    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 interfacial polymerization technique was used in the preparation of organotion polyesters. Dialkyltin dihalides dissolved in an organic solvent immiscible with water were reacted with the dialkali metal or ammonium salt of a dicarboxylic acid. High yields of polyesters were obtained after short reaction times. The polyesters were generally insoluble and were high melting. Copolymers were also obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070091015
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of molecular weight distribution and branching on rheological parameters of polyethylene melts. Part I. Unfractionated polymersPresented at the 145th National Meeting of the American Chemical Society, New York, N. Y., September 1963. (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 757-765 
    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: It is well known that the rheological behavior of polyethylene melts is affected by at least four variables: (1) molecular weight, (2) molecular weight distribution, (3) long-chain branching and its distribution, and (4) short-chain branching. Of these, the first three appear to have the largest effects. In the present paper an attempt is made to determine the effect of molecular weight distribution by rheological studies of polymers having similar molecular weight distribution by rheological studies of polymers having similar molecular weights and degrees of branching, but varying considerably in their molecular weight distributions as determined by fractionation. The rheological parameters studied were melt recovery, non-Newtonian behavior, critical shear rate, and melt strength. It is shown that the melt recovery increases uniformly as the molecular weight distribution broadens. The degree of non-Newtonian behavior, as measured by the exponent n of the power law, also increases with distribution breadth and is particularly affected by the amount of low molecular weight polymer present. Melt strength increases in a similar manner. Critical shear rate is inversely related to the breadth of the molecular weight distribution and is particularly dependent on the molecular weight of the highest fractions. The log of the critical shear rate is inversely proportional to the melt index recovery.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090232
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of molecular weight distribution and branching on rheological parameters of polyethylene melts. Part II. Fractions and blendsPresented at the 145th National Meeting of the American Chemical Society, New New York, N. Y., September 1963. (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 767-776 
    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: Studies of the rheological properties of fractions of linear and branched polyethylenes have shown that the melt recovery of linear polyethylene fractions is very small and independent of molecular weight over a wide range. Fractions containing high degrees of long-chain branching, on the other hand, have high melt recoveries. The melt recovery of a fraction can therefore be used as an index of long-chain branching. Alternatively, if no long-chain branching is present, the melt recovery is a unique function of the molecular weight distribution. This effect is illustrated by blends of fractions. The log of the critical shear rate is a linear function of the log melt viscosity of the fraction for both linear and branched polyethylenes. This would indicate that the critical shear rate of polydisperse samples would depend primarily on the weight-average of Z-average molecular weight of the polymer. This is confirmed by previous studies on polydisperse samples. It also appears that critical shear rate is highly dependent on the homogeneity of the sample. Blends of the same fractions had quite different critical shear rates, depending on the procedure used to prepare them, even though their molecular weight distributions were identical. The change in viscosity with shear rate is not a unique function of molecular weight or melt viscosity. Fractions of linear polyethylene show a greater change in viscosity with shear rate than branched fractions of similar low shear melt viscosity. This suggests that the effect is related to chain entanglement or coordinated segmental motion.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090233
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  • 5
    Electronic Resource
    Electronic Resource
    On molecular rigidity of polymers at low temperatures: NMR observations at 4.2°K. (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 3 (1965), S. 1065-1067 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; 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.1965.110031218
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  • 6
    Electronic Resource
    Electronic Resource
    Separation of stereoisomers of methyl 2,4,6-Heptanetricarboxylate (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 3 (1965), S. 893-896 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.110031101
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  • 7
    Electronic Resource
    Electronic Resource
    ESR study of free radicals formed by γ-irradiation of poly(ethylene terephthalate) (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 3 (1965), S. 993-996 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.110031204
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  • 8
    Electronic Resource
    Electronic Resource
    Refractive index-molecular weight relationships for poly(ethylene oxide)This paper represents the results of one phase of research carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract number NAS7-100, sponsored by the National Aeronautics and Space Administration. (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 2707-2710 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030728
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  • 9
    Electronic Resource
    Electronic Resource
    Reaction of α, α-diphenyl-β-picrylhydrazyl with acids (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 3107-3116 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The action of dilute aqueous mineral acids on α,α-diphenyl-β-picryl hydrazyl (DPPH) has been studied and shown to result in the rapid loss of the characteristic color of the radical. Hydrobromic and hydrochloric acids yield α,α-diphenyl-β-picryl hydrazine (DPPH-H) and the corresponding halogen-substituted α,α-diphenyl-β-picryl hydrazine. Hydroiodic acid gives DPPH-H, iodine, and a small quantity of DPPH. A number of organic acids cause similar reactions. Kinetic studies on the hydrobromic acid system indicate that the reaction is first-order with respect to: hydrogen ion concentration, DPPH concentration, and anion concentration. The ability of the anion to undergo one-electron transfer and to dimerize are also important, and the strongest nucleophile gives the fastest reaction. A mechanism which involves ionic attack is proposed to account for the reaction of DPPH with acid. The limitations of DPPH in studying reaction mechanisms are then discussed in relation to the proposed ionic mechanism.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030906
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and polymerization of N[2-(2-methyl-4-oxopentyl)]-acrylamide-A new reactive vinyl monomerPaper presented at the 147th meeting of the American Chemical Society, Philadelphia, Pennsylvania, April 1964. (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 1601-1608 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The synthesis and polymerization reactivity of N[2-(2-methyl-4-oxopentyl)]-acrylamide (diacetone acrylamide) is described. This reactive vinyl monomer is prepared in good yield from acetone, acrylonitrile and sulfuric acid. Diacetone acrylamide is a white crystalline solid with the water solubility characteristics of acrylamide and the organic solvent solubility of N-alkyl acrylamides. Diacetone acrylamide readily homopolymerizes and forms copolymers with a wide variety of comonomers. Reactivity ratios in the copolymerization of diacetone acrylamide with styrene and methyl methacrylate are reported and the Alfrey-Price Q and e values calculated. These results, along with data from the copolymerization of diacetone acrylamide with a group of typical vinyl monomers, are presented to indicate the high reactivity of this new monomer.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1965.100030427
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