Abstract
Poly(acrylic acid-block-N-isopropylacrylamide) (PAAc-b-PNIPAm)-tethered octafunctional polyhedral olig-omeric silsesquioxane (POSS) were synthesized via POSS-initialized atom transfer radical polymerization. When very short PAAc blocks are placed between the POSS core and PNIPAm short chains, the critical temperature (T c) of POSS-PAAc-b-PNIPAm determined by cloud point measurements varies in a wide temperature range with pH, and its T c is even lower than that of POSS-PNIPAm with similar chain length at pH05.0, indicating a synergic effect between high local chain density and intramolecular interaction between PAAc and PNIPAm. When the PAAc blocks are relatively long, the pH response of POSS-PAAc-b-PNIPAm diminishes owing to the reduced local PNIPAm chain density.
| Original language | English |
|---|---|
| Pages (from-to) | 507-515 |
| Number of pages | 9 |
| Journal | Colloid and Polymer Science |
| Volume | 290 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Apr 2012 |
| Externally published | Yes |
ASJC Scopus Subject Areas
- Physical and Theoretical Chemistry
- Polymers and Plastics
- Colloid and Surface Chemistry
- Materials Chemistry
Keywords
- Critical temperature (T )
- PH responsive
- Poly(N-isopropylacrylamide)(PNIPAm)
- Polyhedral oligomeric silsesquioxane (POSS)
- Temperature responsive