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A phase diagram of neutral polyampholyte : from solution to tough hydrogel

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タイトル: A phase diagram of neutral polyampholyte : from solution to tough hydrogel
著者: Ihsan, Abu Bin 著作を一覧する
Sun, Tao Lin 著作を一覧する
Kuroda, Shinya 著作を一覧する
Haque, Md. Anamul 著作を一覧する
Kurokawa, Takayuki 著作を一覧する
Nakajima, Tasuku 著作を一覧する
Gong, Jian Ping 著作を一覧する
発行日: 2013年 9月
誌名: Journal of Materials Chemistry B
巻: 1
号: 36
開始ページ: 4555
終了ページ: 4562
出版社 DOI: 10.1039/c3tb20790k
抄録: Our recent study has revealed that neutral polyampholytes form tough physical hydrogels above a critical concentration Cm,c by forming ionic bonds of wide strength distribution. In this work, we systematically investigate the behavior of a polyampholyte system, poly(NaSS-co-DMAEA-Q), randomly copolymerized from oppositely charged monomers, sodium p-styrenesulfonate (NaSS) and acryloyloxethyltrimethylammonium chloride (DMAEA-Q) without and with a slight chemical cross-linking. A phase diagram of formulation has been constructed in the space of monomer concentration Cm and cross-linker density CMBAA. Three phases are observed for the as-synthesized samples: homogeneous solution at dilute Cm, phase separation at semi-dilute Cm, and homogenous gel at concentrated Cm. Above a critical Cm,c, the polyampholyte forms a supramolecular hydrogel with high toughness by dialysis of the mobile counter-ions, which substantially stabilizes both the intra- and inter chain ionic bonds. The presence of the chemical cross-linker (CMBAA > 0) brings about a shift of the tough gel phase to lower Cm,c. The tough polyampholyte gel, containing [similar]50 wt% water, is highly stretchable and tough, exhibits fracture stress of σb [similar] 0.4 MPa, fracture strain of εb [similar] 30, and the work of extension at fracture Wext [similar] 4 MJ m−3. These values are at the level of most tough soft materials. Owing to the reversible ion bonds, the poly(NaSS-co-DMAEA-Q) gels also exhibit complete self-recovery (100%) and high fatigue resistance upon repeated large deformation.
Rights: embargo12ヶ月あり(2014.9以降)
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/58074
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 龔 剣萍 (Gong Jian Ping)

 

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