ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    On the dissociation equilibrium of high-molecular weak electrolytes (1951)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 7 (1951), S. 89-95 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Using the cellulose glycolic acid ethers of various etherification degrees as a sample of high-molecular weak electrolytes, investigations were carried out on some problems on the dissociation equilibrium, such as the influence of sample concentration, distribution density of electrolyte radicals, the salt effect, and the effect of neutralization reagents. The experimental data were treated by means of the modified Kern's dissociation formula (1) and Kagawa's formula (2). (1)$$ \frac{{a_{\rm H} \cdot \alpha }}{{1 - \alpha }} = K = K_s \left( {\frac{{1 - \alpha }}{\alpha }} \right)^m $$ (2)$$ \frac{{a_{\rm H}^2 }}{{C_{\rm P} (1 - \alpha )}} = k = k_s \left( {\frac{{1 - \alpha }}{\alpha }} \right)^n $$ The results obtained were discussed with Kagawa's opinion on the fixation of counterions.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1951.120070108
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Activity of counter ion in polyelectrolyte solutions (1955)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 17 (1955), S. 365-374 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The activity of silver ion was measured potentiometrically with various sample solutions of silver or silver-sodium salt, prepared from three different kinds of carboxymethylcellulose, for the purpose of elucidating these several points: dependence of the activity coefficient of counter ion upon the concentration of polyelectrolyte in salt-free solutions; influence of the silver content of the sample upon activity coefficient; salt effect on activity coefficient; and dependence of activity coefficient upon the degree of neutralization. These experimental results indicate that the characteristics of polyelectrolyte solutions are in many respects quite different from those of simple electrolyte solutions. The applicability of the theory proposed by Ōsawa, Imai, and Kagawa is discussed in some detail, although the discussion is restricted to the salt-free system only.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1955.120178504
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Viscometric behavior of polyacrylate ion in concentrated salt solutions (1955)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 18 (1955), S. 535-542 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Viscosities of polyacrylate ion in the presence of potassium bromide, sodium bromide, lithium bromide, sodium iodide, sodium hydroxide, and hydrochloride acid in aqueous solution were measured over the approximate ranges 0.0-0.6% polymer and salt up to saturation with respect to polyacrylate or to salt. The general initial effect of added electrolyte is to reduce the ratio ηsp/c and to convert the curve characteristic of polyelectrolytes into a straight line, which can be extrapolated to zero polymer concentration to given [η], the intrinsic viscosity of the polymer in the presence of excess salt. Sodium hydroxide and sodium bromide produce minima in plots of [η] against salt concentration. Sodium iodide precipitates polyacrylate at 1.5 N iodide as a translucent gel, which redissolves at 3.0 N and finally reprecipitates at 6 N. In the latter range of concentration, [η] exhibits a maximum. Both by-ions and counter-ions have specific effects on the viscosity of the polyion.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1955.120189009
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Colligative properties of polyelectrolyte solutions. VI. Donnan membrane equilibrium (1959)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 38 (1959), S. 213-228 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Donnan membrane equilibrium of a linear polyelectrolyte solution was studied, using sodium polyvinyl alcohol sulfate as the sample and sodium chloride as the diffusible salt. Simultaneous measurements of membrane potential, sodium and chloride ion activities, sodium chloride distribution, osmotic pressure, and viscosity were carried out. The measurements of membrane potential and ionic activities gave consistent results which could be accounted for by the Donnan theory. The second virial coefficient, which was found to be much lower than the ideal Donnan term, was examined according to Scatchard's theory. It was found that while the theory gave a good qualitative explanation to the experimental results, it could not be used for quantitative discussion. For quantitative examination of the experimental second virial coefficient, the value of second virial coefficient was calculated from the assumption that osmotic pressure is proportional to the difference of the sum of solute activities on both sides of membrane, and was found to be nearly equal to the observed value.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1959.1203813319
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Theory of strong polyelectrolyte solutions. I. Coiled macro ions (1954)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 13 (1954), S. 93-111 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new theory of strong polyelectrolyte solutions based upon the Poisson-Boltzmann equation is presented. Assuming that the ratio of the effective charge of the macro ion to its original charge is very small, the Poisson-Boltzmann equation is solved without adopting the Debye-Hückel approximation. As a result of the calculation, the effective charge of the actual coiled macro ion with the strongly dissociative groups was found small enough to justify this assumption for the solutions of varying concentration over wide range. Moreover, the free energy, and consequently the chemical potential of the components, of the polyelectrolyte solution with or without simple salt are calculated. The idea of “ion fixation” is theoretically introduced as convenient for representing the state of the polyelectrolyte solution. The theoretical results obtained above are quantitatively compared with experimental data with very good agreement.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1954.120136808
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Theory of the effect of counterion size upon titration behavior of polycarboxylic acids (1957)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 23 (1957), S. 477-484 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The effect of the ionic radius of counterions has been introduced into the dissociation theory of polyelectrolytes, using the familiar rod-like model. Increments in the average dissociation constant pKa and slope n for polyacrylic acid with increasing size of the gegenion have been calculated and compared with data using potassium and some tetraalkylammonium hydroxides. Good agreement is encountered. The effects of changes in concentration of the polyacid and of the presence of neutral salt are also considered.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1957.1202310340
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Colligative properties of polyelectrolyte solutions. IV. Activity coefficient of sodium ion (1958)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 31 (1958), S. 256-256 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1958.1203112257
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Colligative properties of polyelectrolyte solutions. V. Activity coefficients of counter- and by-ions (1959)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 37 (1959), S. 375-383 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Simultaneous measurements of the activity coefficients of counter- and by-ions in polyelectrolyte solutions were carried out. Sodium polyvinyl alcohol sulfate was used as the sample of polyelectrolyte and sodium chloride as the extraneous salt. The activity coefficient of sodium counter-ion was determined by using a sodium amalgam electrode and that of chloride ion was determined by a sliver-silver chloride elctrode. It was found that the activity coefficient of both counter- and by-ions has little relationship with the volume of polymer coil, and that the additivity of counter-ion activity found for hydrogen ion by Mock and Marshall holds also for sodium ion. It was also found that there is good agreement between the experimental results and the theory of Katchalsky and Lifson if we use their same theory for calculating the volume of polymer coil, although the volume is too large to be considered reasonable.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1959.1203713208
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Ripening reactions of viscose (1951)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 7 (1951), S. 421-430 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: From the same standpoint as Kagawa and Katsuura's opinion on the hydrolysis of cellulose sulfate, the authors argue that the spontaneous decomposition of cellulose xanthate in the course of ripening is ripening is wholly due to the alkali saponification which arises at the unionized ester-group: (1) (2) Taking the characteristic features of the electrolytic dissociation of polymeric electrolytes into consideration, the authors derive theoretically the fomula of saponification velocity: (3)\documentclass{article}\pagestyle{empty}\begin{document}$ - {{d\gamma } \mathord{\left/ {\vphantom {{d\gamma } {dt}}} \right. \kern-\nulldelimiterspace} {dt}} = k\gamma ^n $\end{document} The experimental results agree satisfactorily with this formula when n = 2. The authors also examine experimentally the variation in composition of viscose with especial reference to Na2S and Na2CS3 as the salt components, and explained the secondary reactions in ripening presumably as being caused by the successive decomposition of the primary decomposition product of xanthate, viz., dithiocarbonate, by the following mechanism, in which much stress is laid upon the ionization of reaction components: (4) (5a) (5b)
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1951.120070405
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Activity coefficient of byions and ionic strength of polyelectrolyte solutions (1952)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 9 (1952), S. 405-415 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: With the polyelectrolyte solutions prepared by adding potassium chloride into the solution of sodium carboxymethyl celluloses in the various proportions, the activity of chloride ion was measured potentiometrically, from which the ionic strength of the sample solutions was computed. From these experimental results it has been found that Lewis' law of ionic strength, although it does not hold in the original sense as it is, seems applicable for the polyelectrolyte solutions if an assumption is permitted that the so-called segment accompanied by a portion of counterions behaves like a permanent point-charge ion. Thus, the degree of fixation of counterions was computed, and the dissociation state of strong polyelectrolyte was discussed. Furthermore, a brief report was made on the difference between the activity coefficients of byions and counterions in their thermodynamical meaning as well as on the connection of the nature of polyelectrolyte solutions with that of simple electrolyte solutions according to the authors' two phase conception.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1952.120090502
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...