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  • 1
    Electronic Resource
    Electronic Resource
    Distribution of chemical composition of statistical copolymers from the conversion dependences of copolymer or residual monomer mixture composition (1986)
    s.l. : American Chemical Society
    Macromolecules 19 (1986), S. 1575-1580 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00160a016
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of microgel-containing polymers by the light scattering method: A new method of evaluation and its comparison with other proceduresTo Professor O. Wichterle on the occasion of his 70th birthday (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 2097-2110 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new method suitable for computer treatment was suggested for the evaluation of data obtained by light scattering from polymer solutions containing microgel. The method is based on the assumption of bimodal molar mass distribution and requires no additional data and/or restrictions. The accuracy of the present method was compared with that of other evaluation procedures (suggested by Lange, Gruber and Schurz, Strazielle, and Kratochvíl) using model mixtures consisting of two polymers differing by 2 to 3 orders of magnitude in molar mass. The values of molecular parameters (Mw,1, Mw, z2, (rz,12)1/2, (rz,22)1/2) obtained by the present method are in general more reliable then those calculated by means of the other evaluation procedures.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021841014
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  • 3
    Electronic Resource
    Electronic Resource
    Fractionation of a statistical copolymer in a demixing-solvent system: Theory and experiment (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 48 (1993), S. 1127-1135 
    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 has been shown that, under specific conditions, a demixing-solvent fractionation according to chemical composition can be applied to statistical copolymers. Formally, identical expressions have been derived for the distribution of a copolymer between coexisting phases in precipitation (sol-gel) and demixing-solvent fractionations. Theory predicts that the effects of molar mass and chemical composition cannot be separated in either of the phaseequilibrium fractionations. With demixing solvents, the partition coefficient depends steeply on copolymer composition, which enables one, e.g., to separate homopolymers from a blend. Multistep demixing-solvent fractionation of a copolymer may proceed only in specific cases, e.g., immediately below the maximum of the coexistence curve. A feasibility study was performed with a chemically heterogeneous statistical copolymer of styrene and 2-methoxyethyl methacrylate; the experimental results have confirmed the theoretical predictions. © 1993 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070480701
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of the accuracy of determination of molar mass distribution by the GPC with the on-line light-scattering detector (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 31 (1986), S. 919-928 
    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 effect of errors of the concentration (c-) and the light-scattering molar mass (M-) detector in gel permeation chromatography (GPC) on the accuracy of the determination of the molar mass distribution (MMD) was analyzed. Model calculations showed that the reliability of MMD obtained from c-detector data and from a carefully performed calibration dependence is higher than that obtained by combining data of the M- and c-detectors. A criterion of the uncertainty of the MMD determination by the GPC method with the M-detector was suggested, and its dependence on MMD parameters of the analyzed polymer and on the magnitude of injection was investigated.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070310315
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  • 5
    Electronic Resource
    Electronic Resource
    An analysis of the accuracy of determining molar-mass averages of polymers by GPC with an on-line light-scattering detector (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 34 (1987), S. 2325-2336 
    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 effect of errors of concentration and molar-mass detectors in GPC on the accuracy of determining molar-mass averages Mn and Mw was analyzed. Model calculations show that by means of GPC with an on-line low-angle laser light-scattering (LALLS) photometer only Mw can be determined with acceptable accuracy. Mn can be determined with acceptable accuracy only for polymers that have very small polydispersities. Mn can be determined with greater accuracy from data of a concentration detector and chromatographic-column-calibration data. The most suitable procedure for the determination of Mw seems to be a direct integration of the molar-mass detector output, even if the error due to neglecting the second virial coefficient term is significant. Compared with the inaccuracy of detectors, axial dispersion appears not to be the main source of errors in GPC with an on-line molar-mass detector.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070340622
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  • 6
    Electronic Resource
    Electronic Resource
    Termination in radical copolymerization: Correlation of experimental data (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 3269-3279 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Various termination models in the radical copolymerization are compared on the basis of available experimental data for the dependence of the initial rate of copolymerization on the composition of the monomer mixture. A diffusion-controlled model seems to be more adequate for the majority of reported data than a chemically controlled one. The potential effect of activity coefficients in calculations of the initial rate of copolymerization is discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170211123
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  • 7
    Electronic Resource
    Electronic Resource
    Light scattering in multicomponent solutions - A general equation (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 18 (1980), S. 2369-2377 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A general equation for light scattering in multicomponent solutions is derived and applied to some important systems. The equation is compared with one published earlier by Casassa and Eisenberg [Adv. Protein Chem., 19, 287 (1964)], and the difference between them is explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.180181205
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  • 8
    Electronic Resource
    Electronic Resource
    Model calculations of the distribution function of molecular weight and chemical composition of binary statistical copolymers (1984)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 22 (1984), S. 501-517 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Model calculations based on the kinetics of free-radical copolymerization were carried out for the distribution functions of molecular weight and chemical composition, and for heterogeneity parameters of statistical copolymers. The calculations were conducted so as to depict the dependence of the heterogeneity parameters on the degree of conversion and to make possible an estimate of the maximal heterogeneity of statistical copolymers at given monomer reactivity ratios and rate constants. A comparison of the results obtained with a critical analysis of the feasibility of the determination of heterogeneity parameters by light scattering has revealed that, for statistical co polymers, this method can in principle be used with satisfactory accuracy only with samples of high degree of conversion and high molecular weight. The frequently used approximation P = 0 cannot be applied with out careful verification.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1984.180220312
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