Well-Defined Dual Light- and Thermo-Responsive Rod-Coil Block Copolymers Containing an Azobenzene, MEO2MA and OEGMA
| Autor: | Changjun Park, Jaewon Heo, Sang Youl Kim, Tae-Hyoung Kim, Jinhee Lee |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
controlled polymerization
chemistry.chemical_classification Materials science Polymers and Plastics Photoisomerization MEO2MA Atom-transfer radical-polymerization thermo-responsive behavior rod-coil block copolymer self-assembly General Chemistry Polymer Methacrylate Lower critical solution temperature lcsh:QD241-441 chemistry.chemical_compound End-group azobenzene lcsh:Organic chemistry Azobenzene chemistry Polymer chemistry Copolymer light-responsive behavior OEGMA |
| Zdroj: | Polymers Volume 12 Issue 2 Polymers, Vol 12, Iss 2, p 284 (2020) |
| ISSN: | 2073-4360 |
| DOI: | 10.3390/polym12020284 |
| Popis: | Here we report the dual light- and thermo-responsive behavior of well-defined rod-coil block copolymers composed of an azobenzene unit, 2-(2-methoxyethoxy)ethyl methacrylate (MEO2MA) and oligo(ethylene glycol) methacrylate (OEGMA). Azobenzene-containing rigid rod blocks prepared by chain growth condensation polymerization of the azobenzene containing monomer were used as a macroinitiator of atom transfer radical polymerization (ATRP) after attaching an &alpha bromoisobutyryl group as an end group. Synthesis of well-defined rod-coil block copolymers with different coil block lengths was achieved by copolymerization of MEO2MA and OEGMA monomers. The synthesized polymers exhibited amphiphilic properties and polymeric micelles were formed in aqueous solution. The light-responsive behaviors of azobenzene moieties, photoisomerization by irradiation of light, and thermo-responsive behaviors of P(MEO2MA-co-OEGMA) coil blocks, aggregation by increment of temperature over lower critical solution temperature, were investigated. A dual stimuli-responsive behavior of the rod-coil block copolymers was observed when exposed to light and heat. |
| Databáze: | OpenAIRE |
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