Rheological study on rapid recovery of hydrogel based on oligomeric electrolyte.
The hydrogel consisting of an oligomeric electrolyte, poly[pyridinium-1,4-diyl-iminocarbonyl-1,4-phenylenemethylene chloride] (1-Cl) underwent self-healing at temperatures lower than its gelation temperature after destruction of the gel network in a shear flow. The self-healing mechanism was investigated by rheological measurements on three different kinds of gels including a low-molecular weight organogelator and a polymeric hydrogelator. Although all of the three gels exhibited thermo-reversible hysteresis loops in the shear moduli, only 1-Cl hydrogel recovered its mechanical properties after vigorous agitation. It is conjectured that the self-healing is due to formation of network structure via a chlorine ion mediated hydrogen bond for which the activation energy is on the order of 10 kJ/mol.
Kundu
Shyamal Kumar
SK
Institute for Solid State Physics, The University of Tokyo, Kashiwanoha, Kashiwa, Chiba, Japan.
Matsunaga
Takuro
T
Yoshida
Masaru
M
Shibayama
Mitsuhiro
M