A Study on the Thermodynamic Properties of Interactionbetween Polyelectrolyte and Surfactants

• Main Authors: Hsiao-Yun Yen, 顏孝耘
• Other Authors: 陳立仁
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/68287824696047214150

碩士 === 國立臺灣大學 === 化學工程學研究所 === 99 === 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.