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Autonomic healing and welding by interdiffusion of dangling chains in a weak gel
Author(s) -
Yamaguchi Masayuki,
Maeda Rika,
Kobayashi Ryota,
Wada Tadashi,
Ono Susumu,
Nobukawa Shogo
Publication year - 2012
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.3160
Subject(s) - crystallinity , materials science , polymer , glass transition , composite material , prepolymer , rheology , welding , self healing material , self healing , polyurethane , medicine , alternative medicine , pathology
Entanglement couplings of dangling chains in a weak gel are found to be applicable to the design of a self‐repairing polymer. It is confirmed that a cleavage applied using a razor blade is healed at room temperature without any manual intervention. Further, the healing efficiency is improved when the molecular weight of a prepolymer, which affects the length of dangling chains, is high. Because the healing occurs by interdiffusion of dangling chains, the relation between ambient temperature and glass transition temperature determines the time required for healing. In other words, a soft rubbery material whose glass transition temperature is lower than room temperature shows immediate healing. A weak gel whose tensile modulus is 100 MPa at room temperature, i.e. a leather‐like material, shows healing even at room temperature in a relatively short time ( ca 2 h). Finally, when a weak gel shows crystallinity, healing occurs at a temperature above the melting point. Because the material has a permanent network structure, it will not show macroscopic flow even after exposure to high temperature. Copyright © 2011 Society of Chemical Industry

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