Abstract
Using capillary viscometry, we have investigated the associative behavior of new amphiphilic telechelics incorporating polyhedral oligosilsesquioxane (POSS) as an end-group of poly(ethylene glycol) (PEG) chains of varying length. Solution viscosities were strongly affected by the solvent composition in THF/water mixtures. When water, a selective solvent for PEO segments but a selective non-solvent for POSS segments, was added to the THF solutions, behavior common to polyelectrolytes was observed. In particular, for relatively high concentrations the reduced viscosity remained nearly concentration-invariant for both POSS telechelics and pure PEG homopolymers, indicating a limiting molecular weight of aggregates. On the other hand, a dramatic increase in the reduced viscosity was observed with decreasing concentration for lower concentration values, suggesting aggregate formation and a concentration-dependent aggregate size.
Original language | English (US) |
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Pages (from-to) | 6202-6207 |
Number of pages | 6 |
Journal | Polymer |
Volume | 47 |
Issue number | 17 |
DOIs | |
State | Published - Aug 9 2006 |
Keywords
- Polyhedral oligosilsesquioxane
- Solution properties
- Telechelics
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry