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Study on Triblock Copolymers: From Relaxation Dynamics of Solution to Toughening Mechanism of Physical Double Network Hydrogels
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| Title: | Study on Triblock Copolymers: From Relaxation Dynamics of Solution to Toughening Mechanism of Physical Double Network Hydrogels |
| Other Titles: | トリブロック共重合体に関する研究：溶液緩和のダイナミクスからダブルネットワーク物理ゲルの高靭性化原理まで |
| Authors: | 叶, 亜楠 Browse this author |
| Issue Date: | 25-Sep-2018 |
| Publisher: | Hokkaido University |
| Abstract: | H ydrogels composed of three - dimensional polymer network and abundant of water are a class of typical soft and wet matters, which are used for numerous applications including force - sensitive adhesives, scaffolds of tissue engineering, gas filtration membranes, drug - controlled release and ionic conductive media. However, traditional hydrogels are mechanically weak, which limits their application severely. Recently, several tough and self - recoverable hydrogels were developed by introducing physical association as sacrificial bonds to dissipate energy, which widely extend the scope of applications even as structural biomaterials, like artificial cartilage and ligament. Despite great success in creation of tough and self - recoverable hydro gels, the developments genera lly relied on an empirical and trial - and - error approach as the understanding of structure and toughening mechanism of those gels is still unclear . This thesis focuses on revealing the structure and underlying toughening mechanism of tough and self - recover able hydrogels. Recently developed hydrogels based on self - assembly of ABA type triblock copolymer were chosen as a model system, which have been demonstrated to possess excellent mechanical property and self - recoverable capability. These gels are prepared in sequential steps:
(i) firstly the triblock copolymer poly(butyl methacrylate) - b - poly(methacrylic acid) - b - poly(butyl methacrylate) , PBMA - PMAA - PBMA , was dissolved in dimethylformamide ( DMF ) to form precursor solution ;
(ii) then the precursor solution und ergoes a solvent exchange process along 10 with self - assembly of endblock PBMA into micelles act ing as cross - linking to form B gels;
(iii) finally the second polymer , polyacrylamide (PAAm) was introduced to form sacrificial hydrogen bonds between the carboxy group of PMAA and amino group of PAAm , and to generate the tough and self - recoverable hydrogels, named as B - DN gel . In this work, we systematically studied the preparation process and the structure - property relationship of those gels, including relaxation dynamic of precursor solution, contribution of physical crosslinks and trapped entanglements in B - gels, the effect of molecular parameters on self - assembly structure of B - gels, and the structure - property relationship of B - D N gels. Benefiting from the thoro ughly understanding of chain structure and self - assembly structure in gelation process and final gels, we successfully developed thin but ultra - tough and 100 % recoverable hydrogel membranes with high pH sensitivity, excellent mechanical properties and bioc ompatibility , which is urgently needed in many fields but rarely realized in hydrogels before. |
| Conffering University: | 北海道大学 |
| Degree Report Number: | 甲第13331号 |
| Degree Level: | 博士 |
| Degree Discipline: | 生命科学 |
| Examination Committee Members: | (主査) 教授 龔 剣萍, 教授 小松崎 民樹, 教授 黒川 孝幸, 助教 中島 祐 |
| Degree Affiliation: | 生命科学院（生命科学専攻） |
| Type: | theses (doctoral) |
| URI: | http://hdl.handle.net/2115/89227 |
| Appears in Collections: | 課程博士 (Doctorate by way of Advanced Course) > 生命科学院(Graduate School of Life Science)
学位論文 (Theses) > 博士 （生命科学）
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