22.3.3 Self-Healing Composites Based on CD-Guest Interactions
Up to now, most SHPs focus on restoring their mechanical properties by mending the
mechanical damage [35–39]. Only few attempts have been made to materials which
are able to restore other functional properties. Our groups develop a strategy for selfhealing functional materials by connecting functional inorganic particles, such as
nanotubes, magnetic particles, TiO 2 particles, and polymer network through
CD-guest interactions [40–42]. The resulting materials combine the good mechanical properties and the functions of inorganic particles and, furthermore, show
healing ability owing to the host-guest interactions.
For example, a kind of conductive elastomers with autonomic self-healing
properties has been prepared by using poly(2-hydroxyethyl-methacrylate)
(PHEMA) as polymer matrix and connecting β-CD-modified single-walled carbon
nanotubes (β-CD-SWCNTs) with polymer matrix through host-guest interactions
[41]. The preparation process was shown in Fig. 5a. These composites combined
the elasticity of polymer network and the conductivity of the SWCNTs had
autonomic healing ability owing to the host-guest interactions. The mechanical
healing efficiency reached around 90% and electrical healing efficiency reached
Fig. 4 (a) Chemical structure of β-CD-PP AAm hydrogels. (b) Color change of β-CD-PP AAm
hydrogels by heating and applying an alternating electric voltage (60 V). (c) After standing for 24 h,
two cut β-CD-PP AAm hydrogels pieces were rejoined. (Reprinted in part with permission from
Ref. [34]. Copyright 2017, American Chemical Society)
594
S. Zhang et al.
Up to now, most SHPs focus on restoring their mechanical properties by mending the
mechanical damage [35–39]. Only few attempts have been made to materials which
are able to restore other functional properties. Our groups develop a strategy for selfhealing functional materials by connecting functional inorganic particles, such as
nanotubes, magnetic particles, TiO 2 particles, and polymer network through
CD-guest interactions [40–42]. The resulting materials combine the good mechanical properties and the functions of inorganic particles and, furthermore, show
healing ability owing to the host-guest interactions.
For example, a kind of conductive elastomers with autonomic self-healing
properties has been prepared by using poly(2-hydroxyethyl-methacrylate)
(PHEMA) as polymer matrix and connecting β-CD-modified single-walled carbon
nanotubes (β-CD-SWCNTs) with polymer matrix through host-guest interactions
[41]. The preparation process was shown in Fig. 5a. These composites combined
the elasticity of polymer network and the conductivity of the SWCNTs had
autonomic healing ability owing to the host-guest interactions. The mechanical
healing efficiency reached around 90% and electrical healing efficiency reached
Fig. 4 (a) Chemical structure of β-CD-PP AAm hydrogels. (b) Color change of β-CD-PP AAm
hydrogels by heating and applying an alternating electric voltage (60 V). (c) After standing for 24 h,
two cut β-CD-PP AAm hydrogels pieces were rejoined. (Reprinted in part with permission from
Ref. [34]. Copyright 2017, American Chemical Society)
594
S. Zhang et al.