The Interaction Between Acrylonitrile and Acrylonitrile ? Styrene Copolymer by Inverse Gas Chromatography

The interaction between acrylonitrile and an acrylonitrile-styrene copolymer was studied by the use of Inverse Gas Chromatography (IGC). The Gibb's free energy, the ethalpy and entropy were calculated from the chromatographic data. It was found that the negative value of the free energy increases with the decrease in temperature and that the negative value of the heat of adsorption increases with the decrease in the amount of ACN injected into the gas chromatograph. These results indicate that the polymer-monomer interaction increases with the decrease in temperature and monomer concentration pointing to the possibility that at very low monomer concentrations no migration may occur, at ambient temperatures, from a package made of the studied polymer.