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Polymers
Volume 14
Issue 9
10.3390/polym14091823
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Article

Topology and Sequence-Dependent Micellization and Phase Separation of Pluronic L35, L64, 10R5, and 17R4: Effects of Cyclization and the Chain Ends

by
Tomohisa Watanabe
1,
Yubo Wang
1,
Tomoko Ono
2,
Satoru Chimura
1,
Takuya Isono
2,
Kenji Tajima
2,
Toshifumi Satoh
2,
Shin-ichiro Sato
2,
Daichi Ida
3 and
Takuya Yamamoto
2,*
1
Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan
2
Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Hokkaido, Japan
3
Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura 615-8510, Kyoto, Japan
*
Author to whom correspondence should be addressed.
Polymers 2022, 14(9), 1823; https://doi.org/10.3390/polym14091823
Submission received: 6 April 2022 / Revised: 26 April 2022 / Accepted: 27 April 2022 / Published: 29 April 2022
(This article belongs to the Section Polymer Networks and Gels)
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Abstract

The topology effects of cyclization on thermal phase transition behaviors were investigated for a series of amphiphilic Pluronic copolymers of both hydrophilic–hydrophobic–hydrophilic and hydrophobic–hydrophilic–hydrophobic block sequences. The dye solubilization measurements revealed the lowered critical micelle temperatures (TCMT) along with the decreased micellization enthalpy (ΔHmic) and entropy (ΔSmic) for the cyclized species. Furthermore, the transmittance and dynamic light scattering (DLS) measurements indicated a block sequence-dependent effect on the clouding phenomena, where a profound decrease in cloud point (Tc) was only found for the copolymers with a hydrophilic–hydrophobic–hydrophilic block sequence. Thus, the effect of cyclization on these critical temperatures was manifested differently depending on its block sequence. Finally, a comparison of the linear hydroxy-terminated, methoxy-terminated, and cyclized species indicated the effect of cyclization to be unique from a simple elimination of the terminal hydrophilic moieties.
Keywords: cyclic polymer; block copolymer; Pluronic; micellization; cloud point; phase transition cyclic polymer; block copolymer; Pluronic; micellization; cloud point; phase transition
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MDPI and ACS Style

Watanabe, T.; Wang, Y.; Ono, T.; Chimura, S.; Isono, T.; Tajima, K.; Satoh, T.; Sato, S.-i.; Ida, D.; Yamamoto, T. Topology and Sequence-Dependent Micellization and Phase Separation of Pluronic L35, L64, 10R5, and 17R4: Effects of Cyclization and the Chain Ends. Polymers 2022, 14, 1823. https://doi.org/10.3390/polym14091823

AMA Style

Watanabe T, Wang Y, Ono T, Chimura S, Isono T, Tajima K, Satoh T, Sato S-i, Ida D, Yamamoto T. Topology and Sequence-Dependent Micellization and Phase Separation of Pluronic L35, L64, 10R5, and 17R4: Effects of Cyclization and the Chain Ends. Polymers. 2022; 14(9):1823. https://doi.org/10.3390/polym14091823

Chicago/Turabian Style

Watanabe, Tomohisa, Yubo Wang, Tomoko Ono, Satoru Chimura, Takuya Isono, Kenji Tajima, Toshifumi Satoh, Shin-ichiro Sato, Daichi Ida, and Takuya Yamamoto. 2022. "Topology and Sequence-Dependent Micellization and Phase Separation of Pluronic L35, L64, 10R5, and 17R4: Effects of Cyclization and the Chain Ends" Polymers 14, no. 9: 1823. https://doi.org/10.3390/polym14091823

APA Style

Watanabe, T., Wang, Y., Ono, T., Chimura, S., Isono, T., Tajima, K., Satoh, T., Sato, S.-i., Ida, D., & Yamamoto, T. (2022). Topology and Sequence-Dependent Micellization and Phase Separation of Pluronic L35, L64, 10R5, and 17R4: Effects of Cyclization and the Chain Ends. Polymers, 14(9), 1823. https://doi.org/10.3390/polym14091823

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