Abstract
Poly(benzimidazobenzophenanthroline) (BBL) chain ends were substituted with a well-known thermally responsive polymer poly(N-isopropylacrylamide). The resulting polymers showed superior colloidal stability in aq. dispersions compared to previously reported poly(ethylene oxide) substituted BBL, and in one case, particles were found to be colloidally stable up to 900 mM NaCl concn. The typical lower crit. soln. temp. (LCST) behavior of poly(N-isopropylacrylamide) (PNIPAm) in water was partially lost due to the harsh conditions of the chain end substitution reaction but adjusting the pH or ionic strength facilitated thermally induced phase sepn. of the dispersed polymer particles. After cooling to ambient temp., the particles could be re-dispersed and their colloidal stability was regained.
| Original language | English |
|---|---|
| Pages (from-to) | 2957-2965 |
| Number of pages | 9 |
| Journal | Colloid and Polymer Science |
| Volume | 293 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2015 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- Critical solution temperature (lower
- thermally responsive particles of poly(benzimidazobenzophenanthroline) modified with poly(N-isopropylacrylamide))
- Polybenzimidazoles Role: PRP (Properties)
- SPN (Synthetic preparation)
- PREP (Preparation) (polyamide-
- Polyamides Role: PRP (Properties)
- PREP (Preparation) (polybenzimidazole-
- Colloids (stability
- Dispersion of materials
- Molecular weight
- Phase separation
- Semiconductor materials
- Size distributions
- Thermal stability (thermally responsive particles of poly(benzimidazobenzophenanthroline) modified with poly(N-isopropylacrylamide))
- polybenzimidazobenzophenanthroline
- aq
- dispersion
- polyisopropylacrylamide
- modification
- thermal
- responsiveness