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Yamashita Y, Yanagisawa M, Tokita M. Dynamics of Spinodal Decomposition in a Ternary Gelling System. Gels 2018; 4:gels4020026. [PMID: 30674802 PMCID: PMC6209272 DOI: 10.3390/gels4020026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 03/16/2018] [Accepted: 03/19/2018] [Indexed: 11/16/2022] Open
Abstract
The phase diagram and phase transitions of the ternary system of gelatin, water and poly(ethylene glycol) oligomers were studied as a function of the weight fraction of gelatin and the weight fraction and molecular weight of poly(ethylene glycol) oligomers. It was found that both phase separation and the sol-gel transition occur in this ternary system. The relative position of the phase separation line and the sol-gel transition line depends on the weight fraction and the molecular weight of the poly(ethylene glycol) oligomer that coexists in the solution. All aspects of the phase diagram are sensitive to the molecular weight of the poly(ethylene glycol) oligomer. Since the phase separation line crosses the sol-gel transition line in the phase space that is created by the temperature and the weight fraction of gelatin, the phase space is typically divided into four regions, where each region corresponds to a definite phase. The transitions between mutual phases were studied using the light-scattering technique.
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Affiliation(s)
- Yutaro Yamashita
- Department of Physics, Graduate School of Science, Kyushu University, 744 Motooka, Fukuoka 810-0935, Japan.
| | - Miho Yanagisawa
- Department of Physics, Graduate School of Science, Kyushu University, 744 Motooka, Fukuoka 810-0935, Japan.
| | - Masayuki Tokita
- Department of Physics, Graduate School of Science, Kyushu University, 744 Motooka, Fukuoka 810-0935, Japan.
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Affiliation(s)
- Shaul A. Aharoni
- a Chemical Research Center Allied Chemical Company , Morristown, New Jersey, 07960
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Affiliation(s)
- Mikihito Takenaka
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hirofumi Shimizu
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Shotaro Nishitsuji
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Hirokazu Hasegawa
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
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