Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/16873
Title: The effect of Polyelectrolyte on Surfactant clouding
Authors: MOE SANDE
Keywords: Polyelectrolyte, surfactant, clouding, phase separation
Issue Date: 30-Jul-2009
Source: MOE SANDE (2009-07-30). The effect of Polyelectrolyte on Surfactant clouding. ScholarBank@NUS Repository.
Abstract: Interactions between cationic and anionic polyelectrolyte and nonionic surfactants are investigated in the ongoing research project. They are critical for control of industrial products such as paints, detergents, cosmetics, pharmaceuticals, etc. One simple way to study such systems is to determine the clouding point of the mixture. The clouding point and phase behavior of polymer-surfactant systems are remarkably dependent on the polymer species, concentration, and molecular weight. Clouding behavior and the cloud point temperature (CPT) has been investigated for systems containing nonionic surfactant [Triton X-114, Triton X-100, or Pentaethylene Glycol Monododecyl Ether (C12E5)] and polyelectrolyte [anionic sodium polystyrenesulfonate (NaPSS) or cationic polydiallyldimethylammonium chloride (PDADMAC)]. It was observed that NaPSS of low molecular weight may increase CPT, while its counterpart of high molecular weight depresses CPT. For PDADMAC, the CPT is always s reduced. Upon heating slightly above the clouding point temperature, the mixture will separate into two macroscopic phases. From UV-Vis spectrum, it is found that one phase is surfactant rich and the other is surfactant lean. The concentration analysis for NaPSS is also conducted with UV-Vis, and reveals that the polymer is comparably partitioned in the two phases on the contrary. The electrostatic repulsion and hydrophobic interaction are thought to be the dominant forces affecting the clouding and phase separation.<br>
URI: http://scholarbank.nus.edu.sg/handle/10635/16873
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