Diffusion And Equilibrium Measurements In Polymer-Solvent Systems By Inverse Gas Chromatography Method
by
Eser, Hülya.
Title
:
Diffusion And Equilibrium Measurements In Polymer-Solvent Systems By Inverse Gas Chromatography Method
Author
:
Eser, Hülya.
Personal Author
:
Eser, Hülya.
Publication Information
:
[s.l.]: [s.n.], 2004.
Physical Description
:
x, 90 leaves.: ill.+ 1 computer laser optical disc.
Abstract
:
In this study, thermodynamic properties, namely retention volume, infinitely dilute weight fraction activity coefficient, Flory- Huggins interaction parameter, solubility parameters of solute and polymer, partition coefficient and diffusion coefficients of the various solvents in poly (methyl methacrylate co butyl methacrylate) (PMMA co BMA) and poly (lactide co glycolide) (PLGA) at infinite dilution of the solvent have been determined by inverse gas chromatography (IGC). In this technique, a small amount of the solvent was injected into the capillary column and its retention time was measured and used to calculate several polymer-solvent interaction parameters which are mentioned above. The solutes used in this study were methanol, ethanol, propanol, butanol, methyl acetate, ethyl acetate, propyl acetate, dichloromethane, trichloromethane, acetone, methyl methacrylate, butyl methacrylate, water for PMMA co BMA and acetone, dichloromethane, trichloromethane, ethyl acetate, ethyl alcohol, tetrahydrofuran, water for PLGA. The glass transition temperature of the polymers were determined as 106 0C and 42 0C for PMMA co BMA and PLGA respectively by differential scanning calorimetry. Experiments were performed in the range of 150-200 0C for PMMA co BMA and 80-120 0C for PLGA which are above the glass transition temperature of the polymer. The thermodynamic results, obtained from the experiments, indicated that trichloromethane and dichloromethane were the most suitable solutes among all the solvents studied for both of the polymers. The partition (K) and diffusion coefficients (Dp) of various solvents at infinite dilution of the solvent were calculated by using the model developed by Pawlisch et al. (1987). The optimum K and Dp values that best fit the data were found and the model predicted experimental data very well. In summary, IGC method is a powerful tool for the determination of thermodynamic and diffusion properties of solvent in polymer at infinite dilution of the solvent. Vrentas- Duda free volume theory was used to correlate the diffusion data and to investigate the effect of solvent size on diffusion process. The theory has shown to correlate diffusion data above the glass transition temperature very well for the PMMA-co-BMA .solvent system.
Subject Term
:
Inverse gas chromatography
Added Author
:
Tıhmınlıoğlu, Funda
Added Corporate Author
:
İzmir Institute of Technology. Chemical Engineering.
Added Uniform Title
:
Thesis (Master)--İzmir Institute of Technology: Chemical Engineering.
İzmir Institute of Technology: Chemical Engineering--Thesis (Master).
Electronic Access
:
Library | Material Type | Item Barcode | Shelf Number | Status |
---|
IYTE Library | Thesis | T000451 | QD79.C45.E75 2004 C.1 | Tez Koleksiyonu |
IYTE Library | Supplementary CD-ROM | ROM0342 | QD79.C45.E75 2004 EK1 | Tez Koleksiyonu |