Micellization of ω-functionalized diblock copolymers in selective solvent. Study on the effect of hydrogen bonds

A. Karatzas, M. Talelli, T. Vasilakopoulos, M. Pitsikalis*, Nikolaos Hadjichristidis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Two series of cu-functionalized diblock copolymers polystyrene-b- polyisoprene, PS-PI, having hydroxyl end groups either at the PS (PI-PS-OH) or at the PI (PS-PI-OH) block were synthesized by living anionic polymerization. The samples had similar molecular weights but different compositions. Employing suitable post-polymerization reactions the hydroxyl groups were transformed to the corresponding 2-ureido-4-pyrimidinone (UPy) functions. The UPy group is known to dimerize strongly in a self-complementary array of four cooperative hydrogen bonds. The micellization properties of the unfunctionalized and the ω-functionalized polymers having either hydroxyl or UPy end groups were studied in n-decane, which is a selective solvent for the PI block, by static and dynamic light scattering and dilute solution viscometry. A distinct micellar behavior was obtained depending on the nature of the end group and their location either at the core-forming or the corona-forming block. To confirm the results regarding the effect of the hydrogen bonds the solid-state properties of the copolymers were studied by differential scanning calorimetry and thermogravimetric analysis. Furthermore, the dilute solution properties were investigated in chloroform, which is a common good solvent for both the PS and PI blocks but nonpolar, thus allowing the formation of hydrogen bonds.

Original languageEnglish (US)
Pages (from-to)8456-8466
Number of pages11
JournalMacromolecules
Volume39
Issue number24
DOIs
StatePublished - Nov 28 2006

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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