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

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Title: A phase diagram of neutral polyampholyte : from solution to tough hydrogel
Authors: Ihsan, Abu Bin Browse this author
Sun, Tao Lin Browse this author
Kuroda, Shinya Browse this author
Haque, Md. Anamul Browse this author
Kurokawa, Takayuki Browse this author →KAKEN DB
Nakajima, Tasuku Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Issue Date: Sep-2013
Journal Title: Journal of Materials Chemistry B
Volume: 1
Issue: 36
Start Page: 4555
End Page: 4562
Publisher DOI: 10.1039/c3tb20790k
Abstract: 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)
Type: article (author version)
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 龔 剣萍 (Gong Jian Ping)

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