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Solution behavior of normal and reverse triblock copolymers (pluronic L44 and 10R5) individually and in binary mixture.

Authors
  • Naskar, Bappaditya
  • Ghosh, Soumen
  • Moulik, Satya P
Type
Published Article
Journal
Langmuir
Publisher
American Chemical Society
Publication Date
May 08, 2012
Volume
28
Issue
18
Pages
7134–7146
Identifiers
DOI: 10.1021/la3000729
PMID: 22506970
Source
Medline
License
Unknown

Abstract

Solution properties of pluronics L44 or L [(PEO)(10)(PPO)(23)(PEO)(10)] and 10R5 or R [(PPO)(8)(PEO)(22)(PPO)(8)] were studied individually as well in their binary mixtures in aqueous medium. The critical micelle concentration (CMC), critical micelle temperature, and cloud point (CP) were determined. Ideal and nonideal behaviors of their mixtures in the formation of CMC and CP were observed; the energetics of the studied processes were determined. Spectrophotometry, isothermal titration calorimetry and dynamic light scattering (DLS) methods were used for evaluations. Morphologies of the dispersed L, R, and their mixtures along with their polydispersities were determined from DLS measurements. Atomic force microscopy was also employed. The interfacial properties of L and R were investigated forming Langmuir monolayers in a surface balance. The surface pressures (π) generated by the compounds were moderate, the area per molecule was higher for R than L. R has shown antibacterial activity against both gram positive and gram negative bacteria whereas L was inactive in this respect.

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