51
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Li C, Madsen J, Armes SP, Lewis AL. A New Class of Biochemically Degradable, Stimulus-Responsive Triblock Copolymer Gelators. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200600324] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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52
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Kaneko T, Asoh TA, Fukushige Y, Akashi M. Water-Driven Thermoresponsive Peptohelical Cushion. Macromolecules 2006. [DOI: 10.1021/ma052307u] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tatsuo Kaneko
- Department of Nanostructured and Advanced Materials, Department of Science and Engineering, Kagoshima University, 1-21-40, Korimoto, Kagoshima, 890-0065, Japan, and Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan
| | - Taka-aki Asoh
- Department of Nanostructured and Advanced Materials, Department of Science and Engineering, Kagoshima University, 1-21-40, Korimoto, Kagoshima, 890-0065, Japan, and Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan
| | - Yoshitsugi Fukushige
- Department of Nanostructured and Advanced Materials, Department of Science and Engineering, Kagoshima University, 1-21-40, Korimoto, Kagoshima, 890-0065, Japan, and Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan
| | - Mitsuru Akashi
- Department of Nanostructured and Advanced Materials, Department of Science and Engineering, Kagoshima University, 1-21-40, Korimoto, Kagoshima, 890-0065, Japan, and Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan
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53
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Li Y, Tang Y, Narain R, Lewis AL, Armes SP. Biomimetic stimulus-responsive star diblock gelators. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:9946-54. [PMID: 16229513 DOI: 10.1021/la050356u] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Novel biomimetic gelators with star diblock copolymer architectures have been synthesized by atom-transfer radical polymerization (ATRP). Two types of trifunctional ATRP initiator were used to polymerize 2-(methacryloyloxy)ethyl phosphorylcholine [MPC] at 20 degrees C, followed by sequential monomer addition of various tertiary amine methacrylates or mixtures thereof. Poor living character was achieved using an amide-based trifunctional initiator, but the analogous triester initiator gave reasonably well-defined thermo-responsive and pH-responsive star diblock copolymers. The most effective thermo-responsive gelators were obtained by the statistical terpolymerization of 2-(dimethylamino)ethyl methacrylate [DMA], 2-(diethylamino)ethyl methacrylate [DEA], and a monomethoxy-capped poly(propylene oxide) methacrylate [PPOMA], whereas pH-responsive gelators were prepared using 2-(diisopropylamino)ethyl methacrylate [DPA] as the second monomer. Star diblock copolymer gelators that were both thermo-responsive and pH-responsive were obtained by the statistical copolymerization of DMA with DPA. Copolymer compositions were assessed by 1H NMR spectroscopy, and the molecular weight distributions of the three-arm star MPC homopolymer precursors were assessed by aqueous gel permeation chromatography. Static light scattering was used to obtain weight-average molecular weights of selected star diblock copolymers and rheological measurements and variable-temperature 1H NMR were used to probe the onset of gelation.
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Affiliation(s)
- Yuting Li
- Department of Chemistry, Dainton Building, University of Sheffield, Brook Hill, Sheffield S3 7HF, UK
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54
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Morino K, Oobo M, Yashima E. Helicity Induction in a Poly(phenylacetylene) Bearing Aza-18-crown-6 Ether Pendants with Optically Active Bis(amino acid)s and Its Chiral Stimuli-Responsive Gelation. Macromolecules 2005. [DOI: 10.1021/ma047303o] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kazuhide Morino
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Masato Oobo
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Eiji Yashima
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
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55
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Ihata O, Kayaki Y, Ikariya T. Double stimuli-responsive behavior of aliphatic poly(urethane-amine)s derived from supercritical carbon dioxide. Chem Commun (Camb) 2005:2268-70. [PMID: 15856118 DOI: 10.1039/b418850k] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Copolymeric products from 2-methylaziridine and carbon dioxide showed sharp and rapid phase transitions in response to both temperature and pH; the responsive property can be controlled by varying the reaction conditions whilst maintaining the supercritical state.
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Affiliation(s)
- Osamu Ihata
- PRESTO, Japan Science and Technology Agency, 2-12-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
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56
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Serizawa T, Wang ZJ, Tateishi T, Akashi M. Ultrathin Hydrogels Prepared from Poly(acrylic acid-co-acrylamide) and Poly(vinylamine) on a Solid Substrate. Polym J 2004. [DOI: 10.1295/polymj.36.54] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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57
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Serizawa T, Ohmori T, Akashi M. Controlled Polymer Desorption from Layer-by-Layer Assembly into Dilute Ionic Solutions. Polym J 2003. [DOI: 10.1295/polymj.35.810] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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58
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Tachibana Y, Kurisawa M, Uyama H, Kobayashi S. Thermo- and pH-responsive biodegradable poly(alpha-N-substituted gamma-glutamine)s. Biomacromolecules 2003; 4:1132-4. [PMID: 12959575 DOI: 10.1021/bm034123y] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
New double stimuli-responsive poly(alpha-N-substituted gamma-glutamine) has been developed, which was synthesized by the reaction of poly(gamma-glutamic acid) with amino alcohols. Appropriate combinations of the amino alcohols provided the biodegradable poly(amino acid) exhibiting a sharp lower critical solution temperature (LCST) in water. Furthermore, the phase transition temperature was highly sensitive to pH changes.
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Affiliation(s)
- Yoichi Tachibana
- Department of Materials Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
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59
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Goto H, Zhang HQ, Yashima E. Chiral stimuli-responsive gels: helicity induction in poly(phenylacetylene) gels bearing a carboxyl group with chiral amines. J Am Chem Soc 2003; 125:2516-23. [PMID: 12603139 DOI: 10.1021/ja029036c] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Poly(phenylacetylene) gels (gel-1-H and gel-2-H) bearing a carboxy pendant were synthesized either by the copolymerization of (4-carboxyphenyl)acetylene (gel-1-H) with a bis(phenylacetylene) derivative as the cross-linking reagent using a rhodium complex ([Rh(cod)(2)]BF(4): cod = 1,5-cyclooctadiene) as the catalyst or by the cross-linking of poly[(4-carboxyphenyl)acetylene] with diamines (gel-2-H). The obtained gels were found to swell in DMSO and exhibited an induced circular dichroism (ICD) in the long absorption region of the main chain in the presence of optically active amines. These results indicate that a predominantly one-handed helix can be induced in the polymer network of the gels through chiral acid-base interactions. The swelling properties and the Cotton effect intensities of the gels depend on the cross-linking ratio and the chiral amines. Gel-1-Na and gel-2-Na prepared from gel-1-H and gel-2-H, respectively, also significantly swelled in water and showed ICDs characteristic of chiral amino alcohols and free amino acids in water.
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Affiliation(s)
- Hidetoshi Goto
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
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60
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Serizawa T, Nakashima Y, Akashi M. Stepwise Fabrication and Characterization of Ultrathin Hydrogels Prepared from Poly(vinylamine-co-N-vinylformamide) and Poly(acrylic acid) on a Solid Substrate. Macromolecules 2003. [DOI: 10.1021/ma021500a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takeshi Serizawa
- Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
| | - Yumiko Nakashima
- Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
| | - Mitsuru Akashi
- Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
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61
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Serizawa T, Kawanishi N, Akashi M. Layer-by-Layer Assembly between Poly(vinylamine hydrochloride-co-N-vinylformamide) with Variable Primary Amine Content and Poly(sodium styrenesulfonate). Macromolecules 2003. [DOI: 10.1021/ma020734r] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takeshi Serizawa
- Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, Korimoto 1-21-40, Kagoshima 890-0065, Japan
| | - Nami Kawanishi
- Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, Korimoto 1-21-40, Kagoshima 890-0065, Japan
| | - Mitsuru Akashi
- Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, Korimoto 1-21-40, Kagoshima 890-0065, Japan
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62
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Serizawa T, Nanameki K, Yamamoto K, Akashi M. Thermoresponsive Ultrathin Hydrogels Prepared by Sequential Chemical Reactions. Macromolecules 2002. [DOI: 10.1021/ma011465s] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Takeshi Serizawa
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
| | - Kazuhisa Nanameki
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
| | - Kazuya Yamamoto
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
| | - Mitsuru Akashi
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
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