Sulfonation degree determination by adiabatic bomb calorimetry of polystyrene ionomers

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2003
Dumanlı, Ahu Gümrah
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In this study, the sulfonation degree of sulfonated polystyrene is determined by adiabatic bomb calorimeter, which is a novel analysis method for this determination. The theoretical combustion enthalpy calculations are compared with the experimental results and a correlation factor is found between these values. The effect of neutralization on the calorific values is also examined. The sulfonation reaction and the degree of sulfonation are determined by analytical titration method and elemental sulfur analysis and these results are supported by the Tg values obtained from DSC. The molecular weight of polystyrene is determined in order to see the relationship between the experimental calorific value and molecular weight. Atomic Absorption Spectroscopy (AAS) is used to evaluate neutralization of sulfonated polystyrene samples. For this purpose, sulfonated polystyrene (SPS) samples with varying percentage of sulfonation are prepared. These SPS samples are used in the preparation of; 3.28 mol% Zn neutralized polystyrene (3.28% Zn-SPS), 4.38 % Zn- SPS, 6.51% Zn-SPS, 7.29 Zn-SPS and corresponding Magnesium and Aluminum ionomers. Na ionomers; 1.7 %Na-SPS, 2.6% Na*SPS, 4.2% Na-SPS are provided from Exxon laboratories are used also in the adiabatic bomb calorimeter and AAS analysis. The increasing sulfonation degree yields a decrease in both the experimental and the theoretical combustion enthalpy values. Metal ion incorporation i.e. Ai3+ to the structure alters the experimental combustion enthalpy values comparing with the corresponding sulfonated polystyrene. Higher sulfonation degree ionomers i.e. 7.29% Zn-SPS, deviates positively from the decreasing behavior of the combustion enthalpy, due to formation of higher degree of aggregation.
Ionomers, Polystyrene, Atomic absorption spectroscopy, Sulfonated, Adiabatic bomb calorimeter
https://hdl.handle.net/11511/13771
Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats
A. G. Dumanlı, “Sulfonation degree determination by adiabatic bomb calorimetry of polystyrene ionomers ,” M.S. - Master of Science, Middle East Technical University, 2003.
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