Studies on microcapsules View Full Text


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Article Info

DATE

1977-04

AUTHORS

K. Takahashi, T. Kondo

ABSTRACT

Potentiometric titrations of several poly (phthaloyl amino acid) microcapsules were performed using KOH, NaOH, and LiOH as titrants. The effects of amino acid residues, counterion species, and counterions concentration on the titration behavior of the microcapsules were examined by using a theoretical potentiometric equation which allows to calculate the intrinsic dissociation constants for the carboxyl groups and surface potentials of the microcapsules from titration data. The values ofpK0 and ψ0 were found to be appreciably affected by amino acid residues in the polymers constituting the microcapsules. Lower pKo (higher acidity) and less negative surface potential (stronger counterion binding) were obtained in the titration with LiOH than in those with KOH and NaOH. As the counterion concentration in the medium increased, the dissociation of the carboxyl groups was promoted due to the decreased electrical work necessary to remove protons. More... »

PAGES

357-361

References to SciGraph publications

  • 1973-04. Studies on microcapsules in COLLOID AND POLYMER SCIENCE
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf01773532

    DOI

    http://dx.doi.org/10.1007/bf01773532

    DIMENSIONS

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