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COACERVATION AND PHASE BEHAVIOR OF AQUEOUS SOLUTIONS OF OPPOSITELY CHARGED POLYELECTROLYTES

Huang, Shuyue, Huang
http://rave.ohiolink.edu/etdc/view?acc_num=akron152588540294971

Abstract Details

, Master of Science, University of Akron, Polymer Engineering.
Complex coacervation is a liquid-liquid phase separation of a macromolecular solution composed of two oppositely charged polymers, leading to one dense polymer-rich phase called complex coacervate and one solvent-rich phase. Complex coacervates are capable of easily partitioning solutes within them based on relative affinities of solute-water and solute-polyelectrolyte pairs, as the coacervate phase has low surface tension with water, facilitating the transport of small molecules into the coacervate phase. The uptake of small molecules is expected to influence the physicochemical properties of the complex coacervate, including the hydrophobicity within coacervate droplets, phase boundaries of coacervation and precipitation, solute uptake capacity, as well as the coacervate rheological properties. The phase separation, or complex coacervation, upon mixing of aqueous solutions of oppositely charged polyelectrolytes, poly(diallyldimethylammonium chloride) (PDAC) and poly(sodium 4-styrene sulfonate) (SPS) was investigated in the presence of various concentrations of two different dyes, methylene blue (MB) or bromothymol blue (BtB). Besides, partitioning of dyes, including methylene blue (MB), rhodamine B (RhB), and bromothymol blue (BtB) into complex coacervates of branched polyethylenimine and poly(sodium 4-styrenesulfonate) was studied. Turbidity was used to show how various parameters affect phase behavior of polyelectrolyte complexes. UV-vis spectroscopy was used to study the uptake ability of small molecules into coacervate phase. Isothermal titration calorimetry (ITC) was employed to study the intermolecular interaction of dyes revealing strong electrostatic, p-p and cation-p interaction between polyelectrolyte and dye. Zeta potential was applied to study the electrokinetic potential of the particles. Fluorescence measurement was used to study the hydrophobic interaction between dyes and coacervate droplets. Dynamic rheological experiments were taken to study the impact of small molecules on the rheological behavior of coacervates.
Nicole Zacharia (Advisor)
Kevin Cavicchi (Committee Chair)
Tianbo Liu (Committee Member)
Polymers

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Citations

  • Huang, Huang, S. (n.d.). COACERVATION AND PHASE BEHAVIOR OF AQUEOUS SOLUTIONS OF OPPOSITELY CHARGED POLYELECTROLYTES [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron152588540294971

    APA Style (7th edition)

  • Huang, Huang, Shuyue. COACERVATION AND PHASE BEHAVIOR OF AQUEOUS SOLUTIONS OF OPPOSITELY CHARGED POLYELECTROLYTES. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron152588540294971.

    MLA Style (8th edition)

  • Huang, Huang, Shuyue. "COACERVATION AND PHASE BEHAVIOR OF AQUEOUS SOLUTIONS OF OPPOSITELY CHARGED POLYELECTROLYTES." Master's thesis, University of Akron. Accessed APRIL 26, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=akron152588540294971

    Chicago Manual of Style (17th edition)

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