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  • Polymer and Materials Science  (658)
  • 1965-1969  (658)
  • 1
    Electronic Resource
    Electronic Resource
    Infrared and nuclear magnetic resonance of maleic anhydride copolymers and their half esters (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 12 (1968), S. 2191-2200 
    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: Infrared and NMR group-type methods for the analysis of the anhydride content of maleic anhydride copolymers such as poly(maleic anhydride-co-α-olefin) and the half ester content of their reaction products with alcohols are described. The infrared analyses are based on the integrated absorptivities of the anhydride carbonyl and the combination of the acid and ester carbonyl. The NMR method is based on the intensities of the various chemically shifted groups in the copolymer. The use of dimethyl sulfoxide as an auxiliary solvent has made the infrared analysis possible.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1968.070121001
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  • 2
    Electronic Resource
    Electronic Resource
    Poly(arylene sulfones) prepared by friedel-crafts reactions (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 1802-1804 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstract
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1967.150050728
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  • 3
    Electronic Resource
    Electronic Resource
    Elastomeric and mechanical properties of poly-m-carboranylenesiloxanes (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 1725-1735 
    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: A new high-temperature elastomer, SiB-2, has been investigated by stress relaxation, modulus-temperature, and volume--temperature techniques. SiB-2 was found to be more stable than a related elastomer, radiation-cured silicone rubber, having about twice as long as a chemical relaxation time at 250°C. Possible mechanisms to account for this increased stability are discussed. At low temperatures, Tg for SiB-2 was estimated at -34°C., which compares well with Ti = -30°C. for this polymer. By comparison, SiB-3 has Ti = -60°C., while phenyl-modified SiB-4 was found to have Ti = -25°C. Tm for SiB-2 was estimated to be + 56°C.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1966.070101111
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetics of alcohol-isocyanate reactions with metal catalystsFrom a thesis to be submitted by B. Thir to the Graduate School of the University of Detroit in partial fulfillment of the requirements for the M.S. degree in chemistry. (1965)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 9 (1965), S. 1787-1795 
    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: A study has been conducted of the kinetics of the reactions of primary and secondary alcohols with phenyl isocyanate in the presence of metal catalysts. It has been determined that the type and concentration of metal catalyst, the structure of the alcohols, and the type of solvent play an important role in the reaction rates and ratios of rate constants. Catalysis by lead naphthenate increased the reaction rates of 2-methoxy-l-propanol and 1-methoxy-2-propanol more than 3-methoxy-1-propanol, whereas catalysis by dibutyltin dilaurate enhanced the reaction rates of 3-methoxy-1-propanol more than those of 2-methoxy-1-propanol and of 1-methoxy-2-propanol. Dibutyltin dilaurate has been found to impart a high ratio of Kprimary/Ksecondary, where the primary alcohol was 3-methoxy-1-propanol and the secondary alcohol was 1-methoxy-2-propanol. Determinations of mixtures in toluene solutions containing up to 75%, of 3-methoxy-1-propanol were made with good accuracy.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1965.070090514
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  • 5
    Electronic Resource
    Electronic Resource
    The steady flow shear modulus of polymer meltsProd. No. 1277 (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 75-80 
    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: Relaxation times of polyethylene melts have been measured by Aloisio, Matsuoka, and Maxwell. One implication regarding their observations is that the elastic properties of polymer melts must be time-dependent. In particular, the steady-flow shear modulus depends on the strain rate. Some interpretations of data in the literature have been based on concepts in rubber elasticity where the steady-flow modulus is an equilibrium value, independent of strain rate. We have used Pao's theory for viscoelastic flow together with measurements of relaxation times to discuss the strain rate dependence of the steady-flow shear modulus of melts. The existence of a strain rate-dependent shear modulus leads naturally to a nonlinear relation between shear stress and recoverable shear strain. The conclusions regarding the molecular weight dependence of the modulus also differ from interpretations based on rubber elasticity.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1966.070100105
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of the Maxwell orthogonal rheometer (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 127-131 
    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 analysis of the Maxwell orthogonal rheometer for polymer melts is made by using the constitutive equation of White and Metzner. The results indicate that the shear deformation involved is oscillatory and that the storage and loss moduli of the melt may be derived from the measured stress response.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1967.070110110
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  • 7
    Electronic Resource
    Electronic Resource
    Polymerization of styrene with the VOCl3/Li(iC5H11) catalyst systemNCL Communication No. 1034. (1968)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 117 (1968), S. 224-230 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Polymerisation von Styrol mit dem Katalysatorsystem VOCl3/Li(iC5H11) wurde untersucht. Die Polymerisationsgeschwindigkeit fällt mit zunehmendem Li/V-Verhältnis stark ab; die Molekulargewichte der erhaltenen Polymeren haben dagegen bei Li/V = 1 ein Maximum. Die Reaktion ist in bezung auf den Katalysator und das Monomere von der 1. Ordnung. Die Aktivierungsenergie beträgt 5,67 kcal/mol. Zinkdiäthyl wirkt als Überträger. trans-Stilben hat keinen Einfluß, weder auf die Molekulargewichte noch auf die Reaktionsgeschwindgkeit. Bei einem molaren Li/V-Verhältnis von 1 beträgt die mittlere Wertigkeit des Vanadiums 4,12; mit zunehmendem Li/V-Verhältnis fällt sie ab.
    Notes: The polymerization of styrene with the VOCl3/Li(iC5H11) catalyst system has been studied. Rates of polymerization fall sharply with increase in Li/V ratio; the molecular weights, however, show a maximum at Li/V = 1. Polymerization is first order with respect to catlyst as well as monomer concentrations. Activation energy was found to be 5.67 kcal/mole. Zinc diethyl acts as chain transfer agent. There was no effect of trans-stilbene on molecular weights as well as on rate of polymerization. Valence of vanadium at Li/V molar ratio 1 is 4.12 and it decreases with increase in ratio.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1968.021170121
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  • 8
    Electronic Resource
    Electronic Resource
    Zustandsdiagramm des polyäüthylen/polypropylen-systems (1968)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 117 (1968), S. 231-241 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: It is shown that the phase of a mixture of high pressure polyethylene and isotactic polypropylene depends on temperature, weight fraction, and molecular weight of the polymers. Mixtures with high polypropylene content form solid solutions. A variation of the molecular weight of polypropylene has a significant effect on the phase state of the mixture, the molecular weight of polyethylene does not. The phase diagram can be represented best in a three-dimensional coordinate system with temperature, composition, and molecular weight of polypropylene as coordinates.
    Notes: Der Phasenzustand des aus Hochdruckpolyäthylen und isotaktischem Polypropylen bestchenden Polymerengemisches wurde in Abhängigkeit von der prozentualen Zusammensetzung und von den Molekulargewichten der Komponenten untersucht. Es zeigte sich, daß der Phasenzustand von der Temperatur, dem Gewichtsverhältnis der Komponenten und dem Molekulargewicht der Polymeren abhängt. Feste Lösugen bilden sich bei einem hohen Polypropylengehalt des Gemisches. Das Molekulargewicht des Polyäthylens wirkt sich nicht merklich aus, dasjenige des Polypropylens hingegen beeinflußt den Phasenzustand des Gemisches. Das Zustandsdiagramm des Polymerengemisches wird am besten in einem räumlichen Koordinatensystem mit Temperatur, Zusammensetzung und Molekulargewicht des Polypropylens als Koordinaten dargestellt.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1968.021170122
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  • 9
    Electronic Resource
    Electronic Resource
    Some rheological properties of molten polypropylene (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 871-883 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The following measurements were carried out on the melts of two samples of polypropylene, one with a narrow and one with a broad molecular weight distribution: viscosity in steady shear flow, dynamic storage and loss moduli, total normal thrust in cone-and-plate apparatus, and flow birefringence. The validity of various theoretical interrelations between the measured quantities is checked. The influence of molecular weight distribution is qualitatively discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.160060507
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature dependence of the growth rate of spherulites (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 165-180 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The spherulitic growth data that exist in the literature for a wide diversity of polymers have been analyzed according to various possible nucleation mechanisms. It is demonstrated that, if allowed a reasonable choice for the equilibrium melting temperature, no unbiased selection of a unique nucleation process can be made. Moreover, a set of universal parameters exists for each of the allowable nucleation processes which enables the data to be represented by a single straight line which encompasses all the polymers. The only quantities specific to a given polymer are the equilibrium melting temperature and the activation energy for transport. The magnitude of the latter quantity is shown to be dependent on the glass temperature of the polymer.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.160060109
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