Isomeric and structural effects in polymer cononsolvent systems
| Autor: | Xiaolong Lang, Michael J. A. Hore, Yuan Wei, Erin X. Xu, Lauren N. Walters |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Organic Chemistry 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Solvent Propanol chemistry.chemical_compound Monomer Aminolysis chemistry Dynamic light scattering Chemical engineering Materials Chemistry Reversible addition−fragmentation chain-transfer polymerization Solubility 0210 nano-technology |
| Zdroj: | Polymer. 170:190-197 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2019.03.011 |
| Popis: | Thermoresponsive poly ( N -isopropylacrylamide) (PNIPAM) has many analogs that exhibit cononsolvency behavior in mixtures of water and an alcohol. Cononsolvency is characterized by a combination of good solvents for a polymer that results in decreased solubility. In this work, the cononsolvency behavior of linear PNIPAM, four-arm (4f) star PNIPAM, and linear poly( N - n -propylacrylamide) (PNnPAM), with terminal groups that vary in hydrophobicity, were investigated in mixtures of water and propanol. Polymers were synthesized by RAFT polymerization and subsequently functionalized with one pot aminolysis/thiol-ene chemistry. Turbidimetry measurements and dynamic light scattering (DLS) were used to study the cononsolvency behavior by determining the critical solution temperature ( T c ). The measurements show that the size and shape of the hydrophobic region of both the solvent and n-alkyl acrylamide monomer affect T c and the phase transition behavior. The findings suggest methods to impart multiresponsiveness to soft material systems. |
| Databáze: | OpenAIRE |
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