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MODIFICATION OF CALCIUM ALGINATE MEMBRANES WITH MONTMORILLONITE CLAY TO ALTER THE DIFFUSION COEFFICIENT

VALE, JAMES MICHAEL
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1093967807

Abstract Details

2004, MS, University of Cincinnati, Arts and Sciences : Chemistry.
The purpose of this study was to decrease chemical permeation of model compounds through calcium alginate film by adding small amounts of Montmorillonite (MMT) clay. In order to ensure maximum effectiveness of the clay it is crucial for MMT to be sufficiently exfoliated. During exfoliation MMT platelets are separated, thus increasing surface area improving dispersion within the calcium alginate matrix. The extent of exfoliation was verified by Light scattering particle-sizing and X-ray diffraction. Sodium alginate polymer solutions were blended with 0 to10% pre-exfoliated MMT on a dry weight basis to investigate the effect MMT has on alginate permeability. The polymer blends were cast into thin films and dried. The sodium alginate films were crosslinked with calcium chloride solution forming the water insoluble calcium alginate. The MMT impregnated calcium alginate films were subjected to permeation study to determine model chemical permeation. A Hanson Research diffusion cell was used to study the model permeation of a chemical across the calcium alginate membranes. Ultraviolet (UV) absorbance was used to determine the concentration of the model chemical that crossed the alginate membrane. Benzaldehyde was used for the model chemical due to its high UV absorbance and favorable oil to water partition coefficient. Accumulated benzaldehyde concentrations were then used to calculate diffusion coefficients for benzaldehyde within each film. The results indicate exfoliated MMT addition decreased the permeability of calcium alginate polymer membranes. The data show that addition of 0.5% clay yields decreased permeation compared to nascent calcium alginate film by approximately 2.5X. MMT clay amounts above 3% show a complicated clay concentration dependence, but were generally smaller than those of a calcium alginate film with 0% clay.
Dr. James Mark (Advisor)
51 p.
Chemistry, Polymer
alginate; montmorillonite; membrane

Recommended Citations

Citations

  • VALE, J. M. (2004). MODIFICATION OF CALCIUM ALGINATE MEMBRANES WITH MONTMORILLONITE CLAY TO ALTER THE DIFFUSION COEFFICIENT [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1093967807

    APA Style (7th edition)

  • VALE, JAMES. MODIFICATION OF CALCIUM ALGINATE MEMBRANES WITH MONTMORILLONITE CLAY TO ALTER THE DIFFUSION COEFFICIENT. 2004. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1093967807.

    MLA Style (8th edition)

  • VALE, JAMES. "MODIFICATION OF CALCIUM ALGINATE MEMBRANES WITH MONTMORILLONITE CLAY TO ALTER THE DIFFUSION COEFFICIENT." Master's thesis, University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1093967807

    Chicago Manual of Style (17th edition)

ucin1093967807
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© 2004, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.