Melt polycondensation of D,L-lactic acid: MALDI-TOF MS investigation of the ring-chain equilibrium

Sándor Kéki, Ildikó Bodnár, Jenö Borda, György Deák, Miklós Zsuga

Research output: Article

24 Citations (Scopus)

Abstract

The melt polycondensation of D,L-lactic acid was studied by the MALDI-TOF MS method at temperatures ranging from 100 to 220 °C. At low temperature, i.e., up to 120 °C, linear, and at higher temperature both linear and cyclic oligomers were formed. The ring-chain equilibrium was investigated in detail and the concentration-based equilibrium constants (Kx) and their dependence on the degree of polycondensation and on the temperature were determined. It was also found that the molecular size distribution of the linear chain oligomers obeys to "the most probable distribution". A detailed investigation also showed that the ring size distribution of the cyclic oligomers follows the Jacobson-Stockmayer theory.

Original languageEnglish
Pages (from-to)2833-2836
Number of pages4
JournalJournal of Physical Chemistry B
Volume105
Issue number14
Publication statusPublished - ápr. 12 2001

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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