|
Abstract
|
In this work, we investigated the effect of Gelatin on the solubility and diffusivity of normal
pentane in poly (vinyl alcohol) (PVA)/Gelatin (Gel) blends. The processibility of PVA was
enhanced after adding the gelatin as plasticizer to PVA which gelatin could extend the
process widow of PVA with destroying the hydrogen bonding of the polymer matrix.
Therefore, the PVA/Gel blends with different concentrations were prepared by simple
solution-casting method. The intermolecular suitable interactions in PVA/Gel blends
were confirmed using the FTIR, XRD and SEM/EDX analyzes. In the following, the effect
of various factors like temperature, pressure and gelatin content on the thermodynamic
parameters like specific free volume, solubility and diffusivity was investigated. It was
shown that there was a relationship between the specific free volume of the blends with
the solubility and diffusivity of normal pentane in blends. The specific free volume of
blends was determined by applying the PVT data and the Sanchez-Lacombe (SL) equation
of state, in which it was enhanced with increasing of the temperature and gelatin in blends,
respectively. Also, the solubility and diffusivity of normal pentane in samples were determined by the magnetic suspension balance (MSB) system. The results presented that
the solubility and diffusivity of n-pentane improved with increasing of gelatin content in
blend, pressure and temperature decrement, respectively.
|