This work addresses the surface properties and solubility parameters of sodium alginate (SA) using the inverse gas chromatography (IGC) technique. The dispersive component of the surface free energy,γS D, of the studied adsorbent surface was calculated in the infinite dilution region. The specific enthalpy of adsorption,ΔH S, the specific free energy of adsorption, ΔG S, and the specific entropy of adsorption, ΔS S, of solvents on SA were determined. The acidic K A and the basic K D parameters of the SA surface were calculated. The values obtained for K A and K D parameters indicated that the SA surface has a basic character. The interactions between 16 solvents and SA were investigated at a temperature range (373.2–398.2 K). The weight fraction activity coefficient,Ω1 ∞, Flory–Huggins interaction parameter, χ12 ∞, equation-of-state interaction parameter, χ12 *, and effective exchange energy parameter, X eff, of the SA–solvent system were estimated. The results indicated that all the studied solvents are poor solvents for SA. This means that it can be used in the packaging food and biomedical field. The solubility parameter of SA, δ2, was determined as 17.5 (cal/cm3)1/2.

It was determined that the thermal stability of poly(4-methyl-1-pentene) (P4MP) was maintained up to 424 C in an inert atmosphere by thermogravimetric analysis. The retention diagrams of ethyl acetate, tert-butyl acetate, and benzene on P4MP were plotted at temperatures between 30 and 280 C by inverse gas chromatography (IGC) technique. Melting temperature of the polymer was determined as 230 and 239.5C by IGC and differential scanning calorimetry (DSC), respectively. The percent crystallinity of P4MP was obtained from the retention diagrams at temperatures below melting point. , and effective exchange energy parameter, X eff of octane, nonane, decane, undecane, dodecane, tridecane, n-butyl acetate, isobutyl acetate, isoamyl acetate with P4MP, were determined between 240 and 280 C by IGC.

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