Photo- and Thermoinduced Sol-Gel Transitions in Blends of Azobenzene Copolymers and Pluronic Surfactants
Novel self-assembling copolymers of 4-Methacryloyloxyazobenzene and NN-dimethylacrylamide (MOAB-DMA) exhibiting a pronounced photoviscosity effects in water are described. An optimum polymer architecture corresponding to maximum contents of the azobenzene moieties that allowed for the aqueous solubi...
| Principais autores: | , , |
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| Formato: | Artigo |
| Idioma: | English |
| Publicado em: |
2005
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| Assuntos: | |
| Acesso em linha: | http://hdl.handle.net/1721.1/30390 |
| _version_ | 1826205140069122048 |
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| author | Deshmukh, Smeet Bromberg, Lev Hatton, T. Alan |
| author_facet | Deshmukh, Smeet Bromberg, Lev Hatton, T. Alan |
| author_sort | Deshmukh, Smeet |
| collection | MIT |
| description | Novel self-assembling copolymers of 4-Methacryloyloxyazobenzene and NN-dimethylacrylamide (MOAB-DMA) exhibiting a pronounced photoviscosity effects in water are described. An optimum polymer architecture corresponding to maximum contents of the azobenzene moieties that allowed for the aqueous solubility of the MOAB-DMA copolymer at ambient temperature was observed at a molar fraction of the MOAB moieties in the copolymer of 0.2. When blended with Pluronic F127 copolymers, the MOAB-DMA solutions become both irradiation- and temperature-sensitive and capable of sol-gel transitions depending on the MOAB-DMA content. Effect of the MOAB-DMA copolymer addition to concentrated Pluronic F127 solutions was studied by controlled stress rheology. The presence of the amphiphilic MOAB-DMA copolymers in the micellar Pluronic solutions enabled irradiation-dependent shifts in gelation temperature, while the viscoelastic gel modulus was not significantly affected by the MOAB-DMA copolymers, indicating that cubic lattice of the Pluronic responsible for the gel formation was not compromised. The UV- and T-dependent gelling media might prove to become viable electrophoretic separation matrices. |
| first_indexed | 2024-09-23T13:07:23Z |
| format | Article |
| id | mit-1721.1/30390 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T13:07:23Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | mit-1721.1/303902019-04-12T07:24:10Z Photo- and Thermoinduced Sol-Gel Transitions in Blends of Azobenzene Copolymers and Pluronic Surfactants Deshmukh, Smeet Bromberg, Lev Hatton, T. Alan Azobenzene Pluronic F127 photoviscosity effect N-dimethyl acrylamide Novel self-assembling copolymers of 4-Methacryloyloxyazobenzene and NN-dimethylacrylamide (MOAB-DMA) exhibiting a pronounced photoviscosity effects in water are described. An optimum polymer architecture corresponding to maximum contents of the azobenzene moieties that allowed for the aqueous solubility of the MOAB-DMA copolymer at ambient temperature was observed at a molar fraction of the MOAB moieties in the copolymer of 0.2. When blended with Pluronic F127 copolymers, the MOAB-DMA solutions become both irradiation- and temperature-sensitive and capable of sol-gel transitions depending on the MOAB-DMA content. Effect of the MOAB-DMA copolymer addition to concentrated Pluronic F127 solutions was studied by controlled stress rheology. The presence of the amphiphilic MOAB-DMA copolymers in the micellar Pluronic solutions enabled irradiation-dependent shifts in gelation temperature, while the viscoelastic gel modulus was not significantly affected by the MOAB-DMA copolymers, indicating that cubic lattice of the Pluronic responsible for the gel formation was not compromised. The UV- and T-dependent gelling media might prove to become viable electrophoretic separation matrices. Singapore-MIT Alliance (SMA) 2005-12-16T14:56:55Z 2005-12-16T14:56:55Z 2006-01 Article http://hdl.handle.net/1721.1/30390 en Molecular Engineering of Biological and Chemical Systems (MEBCS) 325446 bytes application/pdf application/pdf |
| spellingShingle | Azobenzene Pluronic F127 photoviscosity effect N-dimethyl acrylamide Deshmukh, Smeet Bromberg, Lev Hatton, T. Alan Photo- and Thermoinduced Sol-Gel Transitions in Blends of Azobenzene Copolymers and Pluronic Surfactants |
| title | Photo- and Thermoinduced Sol-Gel Transitions in Blends of Azobenzene Copolymers and Pluronic Surfactants |
| title_full | Photo- and Thermoinduced Sol-Gel Transitions in Blends of Azobenzene Copolymers and Pluronic Surfactants |
| title_fullStr | Photo- and Thermoinduced Sol-Gel Transitions in Blends of Azobenzene Copolymers and Pluronic Surfactants |
| title_full_unstemmed | Photo- and Thermoinduced Sol-Gel Transitions in Blends of Azobenzene Copolymers and Pluronic Surfactants |
| title_short | Photo- and Thermoinduced Sol-Gel Transitions in Blends of Azobenzene Copolymers and Pluronic Surfactants |
| title_sort | photo and thermoinduced sol gel transitions in blends of azobenzene copolymers and pluronic surfactants |
| topic | Azobenzene Pluronic F127 photoviscosity effect N-dimethyl acrylamide |
| url | http://hdl.handle.net/1721.1/30390 |
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