Premium
Influence of a monomeric plasticizer on the water‐sorption behaviour of food‐grade plastics packaging materials
Author(s) -
Kalaouzis Panagiotis J.,
Demertzis Panagiotis G.
Publication year - 1993
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4990320203
Subject(s) - plasticizer , sorption , inverse gas chromatography , enthalpy , chemistry , van deemter equation , diffusion , chemical engineering , activation energy , monomer , polymer , polymer chemistry , materials science , thermodynamics , organic chemistry , adsorption , physics , high performance liquid chromatography , engineering
The interaction of water with poly(vinylchloride) and poly(vinylidene chloride‐vinylchloride) (p(VdC‐VC)) plasticized with different amounts of a monomeric plasticizer (dioctylphthalate) has been studied using inverse gas chromatography. The present work was focused on the effect of temperature and plasticizer content on the water sorption behaviour of these plastics packaging materials. Values for thermodynamic parameters such as Gibb's free energy (Δ G s ), enthalpy (Δ H s ), entropy (Δ S s ) and activity coefficient (γ) corresponding to sorption of water by the polymers have been calculated using chromatographic retention data. It was found that the sorption of water vapours increases with increasing the amount of plasticizer and decreases with increasing temperature. The Van Deemter equation was found to be applicable to these systems and was used to determine diffusion coefficients and activation energies for diffusion. Diffusion coefficient values increase with increasing amounts of plasticizer and they also increase with increasing temperature; this latter increase is accompanied by a decrease in the activation energy for diffusion. Present results were also compared to our own previous data, using a polymeric plasticizer.