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  • Wiley-Blackwell  (20)
  • Springer Nature  (10)
  • Molecular Diversity Preservation International
  • 1970-1974  (30)
  • 1
    Electronic Resource
    Electronic Resource
    Polymer deposition onto the support in column fractionation (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 779-788 
    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 effects of the depositing condition in column fractionation of isotactic polypropylene were studied in detail. A good fractionation was accomplished not only in selective but also in nonselective deposition. Furthermore, it was found, in opposition to Kenyon's opinion, that the polymer was not spread uniformly over the support, but deposited onto the support in the state of particles and that fractionation was not successful in the case of large particles. From these facts, the particle size is regarded as an important factor to attain good fractionation of isotactic polypropylene.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170310
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  • 2
    Electronic Resource
    Electronic Resource
    Fractionation of ethylene-propylene copolymers (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 3241-3241 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070171027
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  • 3
    Electronic Resource
    Electronic Resource
    One-point method for determination of number-average molecular weight (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 2435-2441 
    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 following well-known equation permits the ready determination of Mn from a single osmotic pressure measurement at a known concentration, if the second virial coefficient is previously given: \documentclass{article}\pagestyle{empty}\begin{document}$ \left( {{\pi \mathord{\left/ {\vphantom {\pi C}} \right. \kern-\nulldelimiterspace} C}} \right)^{{1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}} = \left( {{{RT} \mathord{\left/ {\vphantom {{RT} {\bar M_n }}} \right. \kern-\nulldelimiterspace} {\bar M_n }}} \right)^{{1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-\nulldelimiterspace} 2}} \left( {1 + {{\Gamma _2 C} \mathord{\left/ {\vphantom {{\Gamma _2 C} 2}} \right. \kern-\nulldelimiterspace} 2}} \right). $\end{document} On this basis, the one-point method was investigated to determine the number-average molecular weight. It was found that this method was applicable to commercial polymers. However, in this application, the dependence of Γ2 on molecular weight distribution has to be kept in mind.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170810
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  • 4
    Electronic Resource
    Electronic Resource
    Inorganic polymers. IV. Reactions of poly(P-phenylphosphonic imide). The replacement polymerization of poly(P-phenylphosphonic imide) with piperazine (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 14 (1970), S. 1547-1552 
    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: Poly(P-phenylphosphonic imide) reacts with a variety of compounds containing reactive hydrogen atoms, due to the instability of the —P—N—P— linkage to such reagents. Utilization of this property of the polymer may provide convenient routes to prepare various types of P-phenylphosphonic diamides, Ph(O)P(NH2)(NR′2), phosphonamidates, PhP(O)(NH2)(OR), etc. (R = H, alkyl, aryl, etc.). The reaction of the polyimide with piperazine results in a polymer containing structural units. The polymer thus obtained is however only partially soluble in the usual organic solvents, and this insolubility is probably due to crosslinking catalyzed by piperazine. The product polymer was found to be thermoplastic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1970.070140612
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  • 5
    Electronic Resource
    Electronic Resource
    Fractionation of ethylene-propylene copolymers (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 319-331 
    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: Ethylene-propylene (EP) copolymers were fractionated according to chemical composition, molecular weight, or monomer sequence length, which are fundamental distribution factors. Cloud points of polyethylene (PE), polypropylene (PP), and EP copolymer were determined prior to the fractionation. From the results, it was estimated that xylene-butyl cellosolve and tetralin-ethyl carbitol systems were suitable for the fractionations according to chemical composition and molecular weight, respectively. EP random-type copolymers were fractionated using a xylene-butyl cellosolve system. Separations according to chemical composition were obtained as expected. Then, the above polymer fractions were further fractionated in a tetralin-ethyl carbitol system. and the dependence on molecular weight was observed fairly well. Furthermore, fractionation according to monomer sequence length was satisfactorily achieved by solvent extraction using ethyl ether, n-hexane, cyclohexane, and n-heptane. Therefore, it is concluded that the more detailed characterizations of EP copolymers are made possible by a combination of these techniques.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170201
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of the combination of solvent and nonsolvent on the fractionation of polypropylene (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 2257-2268 
    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 effects of the combination of solvent and nonsolvent on the column fractionation of polypropylene were investigated. Decalin, kerosene, and α-chloronaphthalene were employed as the solvents, whereas ethyl and butyl carbitol were employed as the nonsolvents. It was found that the molecular weight distribution of the fractions was not very significantly affected by the combination of solvent and nonsolvent. By applying Caplan's theory, namely, that M̄-1/2 is a linear function of the weight fraction of solvent contained in the eluent (where M is the average molecular weight of a fraction), we concluded that to conduct a good fractionation both the solvent and the nonsolvent should be poorer solvents for the polymer.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070160909
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis on the fractionation of polyethylene-polypropylene blends (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 1351-1358 
    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 hypothetical fractionation of polyethylene-polypropylene blends was carried out by assuming adequate molecular weight distribution and partition of polymer between two liquid phases for each hompolymer, and also by using the previously reported data of the molecular weight dependence on solubility. The experimental fractionation of blends was also carried out by the solvent gradient method, and the results were compared with those obtained by the hypothetical fractionation. Both results agreed fairly well in various distribution forms. Therefore, these results may provide valuable information for component or compositional analysis of unknown samples or copolymerization products.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070180506
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of the fractionation of ethylene-propylene copolymerization products (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 3345-3363 
    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 solution fractionation of ethylene-propylene copolymerization products was simulated by assuming an appropriate partition relationship for the polymer distribution between the two liquid phases and by using data for the molecular weight dependence of the solubility. Bivariate and log normal distribution functions were assumed for the polydispersities of the copolymer and the homopolymers, respectively. The products can be classified into five types: copolymer (EP), polyethylene-polypropylene (PE-PP), polypropylene-copolymer (PP-EP), polypropylene-copolymer-polyethylene(PP-EP-PE), and copolymer-polyethylene (EP-PE). The present work is mainly concerned with the latter three types. The experimental results, which could not be explained earlier in terms of pure EP or PE-PP blends, could be explained by the present computer analysis. Thus, even though the distribution curves vary in a complicated way with the component types and the ratios of amounts present, analysis of this kind should be useful for understanding the nature of unknown samples. Finally, the possibility of isolating pure components by solution fractionation is discussed.
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1974.070181114
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  • 9
    Electronic Resource
    Electronic Resource
    Fractionation of polypropylene by the rising temperature method (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 2235-2244 
    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: Polypropylene having high isotacticity was fractionated by the rising temperature method. This method was then compared with the solvent gradient method through the characterization of fractions. It was found that the elution behavior in the rising temperature method was explainable by the equation of equilibrium between the polymer in dilute solution and the solid state polymer on the support, assuming that the heat of fusion and transition points for the deposited polymer were variable with polymer species.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170722
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of triphenyl phosphite on the radical polymerization of acrylonitrile (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 151 (1972), S. 49-57 
    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: Bei der radikalischen, durch Azoisobuttersäuredinitril initiierten Polymerisation von Acrylnitril (AN) bewirkt zugesetztes Triphenylphosphit (TPP) je nach der angewendeten Menge entweder eine Verlangsamung oder eine Beschleunigung der Reaktion. Es wird angenommen, daß die Verlangsammung auf der Bildung relativ reaktionsträger Phosphoranylradikale aus TPP und 2-Cyanoisopropylradikalen beruht. Die Beschleunigung der Reaktion bei gröperem Zusatz von TPP wird mit der Bildung eines lockeren Komplexes aus AN und TPP erklärt, der durch UV-Spektren nachgewiesen wurde und der schneller polymerisiert als das reine AN. TPP hat keinen signifikanten Einfluß auf die Molekulargewichte der Polymeren. Der sehr geringe Phosphorgehalt (0,02-0,06%) entspricht einer Menge von nur 1-4 Atomen P pro Makromolekül.
    Notes: In the polymerization of acrylonitrile initiated with α,α′-azobisisobutyronitrile, triphenylphosphite exhibited two different effects on the rate of polymerization, a decreasing effect and an increasing effect. The decrease is due to the phosphoranyl radical formed by the addition of a 2-cyanopropyl radical to triphenylphosphite. The increase is due to the formation of a weak n-π complex between triphenylphosphite and acrylonitrile, which was confirmed from the UV absorption spectra. Triphenylphosphite had no significant effect on the molecular weight of the polymer. The phosphorus content in the polymer was small (0.02-0.06%), the number of phosphorus units in one polymer chain being 1-4.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021510104
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