A Study on the Thermodynamic Properties of Interaction between Polyelectrolyte and Surfactants
Date Issued
2011
Date
2011
Author(s)
Yen, Hsiao-Yun
Abstract
In the first part of this study, we examine the concentration regimes of poly(acrylic acid) (PAA) solution by capillary viscometer. Through the capillary viscometer, we find that under specific concentration (0.05 wt%), the solution will be in the semidilute-unentangled regime as the PAA Mw equals to 4500000 or 2500000 while it will be the dilute regime as the PAA Mw equals to 5000 or 1800.
In the second part, the interaction between anionic polyelectrolyte, poly(acrylic acid) and cationic surfactant, Tetratrimethylammonium bromide (C14TAB) has been investigated by isothermal titration calorimetry measurements. We found that in the different viscosity regime will affect the system.
In the third part, the interaction between anionic polyelectrolyte, poly(acrylic acid) and anionic surfactant, sodium dodecyl sulfate (SDS) has been investigated by isothermal titration calorimetry measurements, PH meter, and tensiometer. Poly(acrylic acid) chain becomes more hydrophobic by adding sodium dodecyl sulfate into poly(acrylic acid) solution. Then sodium dodecyl sulfate can form micelles on poly(acrylic acid) chain due to hydrophobic effect.
In the fourth part, the interaction between anionic polyelectrolyte, poly(acrylic acid) and nonionic surfactant, n-Octyltetraoxyethylene (C8E4) has been investigated by isothermal titration calorimetry measurements and tensiometer. N-Octyltetraoxyethylene can form micelles on poly(acrylic acid) chain due to hydrophobic effect.
Subjects
polyelectrolyte
PAA
surfactants
mixed micelle
surfacetension
isothermal titration calorimeter
SDS
C14TAB
C8E4
Type
thesis
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