Journal of Materials Science

, Volume 49, Issue 14, pp 5076–5086 | Cite as

Determination of thermodynamic interactions of poly(l-lactide) and biphasic calcium phosphate/poly(l-lactide) composite by inverse gas chromatography at infinite dilution

  • Aleksandra B. Nastasović
  • Nenad L. Ignjatović
  • Dragan P. Uskoković
  • Dana D. Marković
  • Bojana M. Ekmeščić
  • Danijela D. Maksin
  • Antonije E. Onjia
Article
  • 252 Downloads

Abstract

Inverse gas chromatography at infinite dilution was applied to determine the thermodynamic interactions of poly(l-lactide) (PLLA) and the composite of biphasic calcium phosphate and PLLA (BCP/PLLA). The specific retention volumes, \( V_{\text{g}}^{0} \), of 11 organic compounds of different chemical nature and polarity (non-polar, donor or acceptor) were determined in the temperature range of 308–378 K for PLLA and 308–398 K for BCP/PLLA. The weight fraction activity coefficients of test sorbates, \( \Omega_{1}^{\infty } \), and the Flory–Huggins interaction parameters, \( \chi_{12}^{\infty } \), were estimated and discussed in terms of interactions of the sorbates with PLLA and BCP/PLLA. Also, the partial molar free energy, \( \Delta G_{1}^{\infty } \), the partial molar heat of mixing, \( \Delta H_{1}^{\infty } \), the sorption molar free energy, \( \Delta G_{1}^{\text{S}} \), the sorption enthalpy, \( \Delta H_{1}^{\text{S}} \), and the sorption entropy, \( \Delta S_{1}^{\text{S}} \), were analyzed. A different chromatographic behavior of the two investigated samples, PLLA and BCP/PLLA, was observed. The values of \( \Omega_{1}^{\infty } \) indicated n-alkanes, diethyl ether, tetrahydrofurane (THF), cyclohexane, benzene, dioxane (except for 338 K), and ethyl acetate (EtAc) (except for 338 K) as non-solvents, and chloroform (CHCl3) as good solvent (except for 378 K) for PLLA. For BCP/PLLA, CHCl3, EtAc (for 378 K), dioxane (except for 378 K), and THF were indicated as good solvents.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Aleksandra B. Nastasović
    • 1
  • Nenad L. Ignjatović
    • 2
  • Dragan P. Uskoković
    • 2
  • Dana D. Marković
    • 3
  • Bojana M. Ekmeščić
    • 1
  • Danijela D. Maksin
    • 3
  • Antonije E. Onjia
    • 3
  1. 1.University of Belgrade, Institute for Chemistry, Technology and Metallurgy, Department of ChemistryBelgradeRepublic of Serbia
  2. 2.Centre for Fine Particles Processing and NanotechnologiesInstitute of Technical Sciences of the Serbian Academy of Sciences and ArtsBelgradeRepublic of Serbia
  3. 3.University of Belgrade, Vinča Institute of Nuclear Sciences, Department of Chemical Dynamics and Permanent EducationBelgradeRepublic of Serbia

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