Abstract
Micellization of three ethylene oxide-propylene oxide block copolymers L43 (EO 6 PO 21 EO 6 , mw PPO = 1220, %PEO = 30), PI23 (EO 20 PO 69 EO 20 , mw PPO = 4025, %PEO = 30) and F127 (EO 99 PO 69 EO 99 , mw PPO = 4025, %PEO = 70) in aqueous sodium chloride solution was examined by surface tension, dynamic light scattering and viscosity measurements over the temperature range 30-50°C. Salt induced micellization and micelle growth was observed; the presence of added sodium chloride develops hydrophobicity in the PPO moiety and reduces hydrophilicity of PEO moieties favouring micellization of these block copolymers at relatively lower concentrations than in water at ambient temperature. The results are discussed in terms of CMC, area/molecule, and hydrodynamic size of micelles. Aggregation pattern of copolymers with different molecular characteristics showed similarity but with some marked differences.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.