A colourimetric method for the determination of the degree of chemical cross-linking in aspartic acid-based polymer gels

B. Gyarmati, N. Hegyesi, B. Pukánszky, A. Szilágyi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A 2,4,6-trinitrobenzenesulphonic acid (TNBS)-based assay is developed to determine the degree of chemical cross-linking in aspartic acid-based polymer gels. The conventional colourimetric method for the quantitative determination of amine groups is difficult to use in polymer networks; thus, an improved method is developed to analyse polymer gels swollen in dimethyl sulfoxide (DMSO). Reaction products of the derivatizing reaction are examined by NMR. The chemical stability of the reagent is increased in DMSO, and the method shows satisfactory linearity and accuracy. The degree of chemical cross-linking in the investigated gels is close to its theoretical maximum, but the conversion of the pendant amine groups to cross-linking points is strongly dependent on the feed composition of the gels.

Original languageEnglish
Pages (from-to)154-164
Number of pages11
JournalExpress Polymer Letters
Volume9
Issue number2
DOIs
Publication statusPublished - 2015

Fingerprint

aspartic acid
Aspartic Acid
Polymers
Gels
gels
Dimethyl sulfoxide
Acids
polymers
Dimethyl Sulfoxide
Amines
amines
Trinitrobenzenesulfonic Acid
Chemical stability
Reaction products
reaction products
linearity
reagents
Assays
Nuclear magnetic resonance
nuclear magnetic resonance

Keywords

  • 2,4,6-trinitrobenzene-sulphonic acid
  • Cross-linking ratio
  • Degree of cross-linking
  • Poly(aspartic acid)
  • Polymer gels

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry
  • Chemical Engineering(all)
  • Organic Chemistry
  • Physical and Theoretical Chemistry

Cite this

A colourimetric method for the determination of the degree of chemical cross-linking in aspartic acid-based polymer gels. / Gyarmati, B.; Hegyesi, N.; Pukánszky, B.; Szilágyi, A.

In: Express Polymer Letters, Vol. 9, No. 2, 2015, p. 154-164.

Research output: Contribution to journalArticle

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AU - Szilágyi, A.

PY - 2015

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