Adsorption Thermodynamics of Polyamidoamide Epichlorohydrin Polymer in an Aqueous Fibrous Suspension

This study was to examine the thermodynamic features of polyelecrolytic adsorption of polyamidoamine-epichlorohydrin(PAE) in a papermaking wet-end. The PAE adsorption experiments were conducted in a stirred jar containing an aqueous fibrous suspension and evaluated in terms of Langmuir and Freundlich parameters. The electrokinetic property of a stock was examined by measuring the zeta potential of each colloidal suspension. The polyelectrolytic PCD titration was employed to determine the adsorbed amounts of PAE polymer. The zeta potential of a stock, being varied significantly depending upon the addition of PAE polymer, showed initially a sharp increase and later an exponential decay as a function of time . The PAE adsorption exhibited a pseudo-Langmuir adsorption behavior at$20^{\circ}C$ , whereas its Freundlich power(v) increased in a proportional way at an elevated temperature. The train numbers calculated on the basis of adsorption thermodynamics were 7 to 8. The length of the extended loop of PAE was calculated as 215 nm at $20^{\circ}C$ and increased at a rate of 9% at every $10^{\circ}C$ rise in temperature. The PAE adsorption was proven to be an exothermic physisorption with the estimated adsorption enthalpy of -27 to -29 kJ/mol.

Keywords

PAE ; Papermaking ; Polymer Adsorption ; Langmuir ; Enthalpy

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@article{ JCGMDC_2003_v47n3_220} ,title={Adsorption Thermodynamics of Polyamidoamide Epichlorohydrin Polymer in an Aqueous Fibrous Suspension} ,volume={3} , url={http://dx.doi.org/10.5012/jkcs.2003.47.3.220}, DOI={10.5012/jkcs.2003.47.3.220} , number= {3} , journal={Journal of the Korean Chemical Society} , publisher={Korean Chemical Society} , author={Sung-Hoon, Yoon and Kwang-Suk, Joo and Tae-Won, Lee and Kun-Han, Kim and Byung-Bin, Park} , year={2003} , month={Jun}