This paper presents a hybrid network system composed of titania and a linear copolymer based on methyl methacrylate (MMA) and methacrylic acid (MA) monomers. The bonding between the carbonyl groups of the MMA and titania in this hybrid network system was inhibited via the addition of tetrabutylphosphonium chloride. Simultaneously, the titania components in the hybrid network system formed thermally reversible bonds with the carboxyl groups of the MA. The proposed hybrid copolymer not only melt molded and maintained a high titania dispersibility but also exhibited excellent 3D shape-memory characteristics. A bulk 3D body composed of multiple layers of the hybrid film achieved a fixed compressed state of approximately 41% that can be restored with a recovery rate of 81% via reheating.
In
this study, we developed a double-network hybrid polymer that
controls the strength and density of cross-linking points by utilizing
the bonds of titania and catechol groups with an o-nitrobenzyl group (ONBg) as the photoreactive cross-linking points.
In addition, this hybrid material system, which is composed of thermally
dissociable bonds between titania and carboxyl groups, can be molded
before light irradiation. The Young’s modulus increased by
approximately 1000 times upon irradiation with UV light. Moreover,
introducing microstructures using the photolithography technique improved
the tensile strength and fracture energy by approximately 32 and 15
times, respectively, compared to the sample without the photoreaction.
The improved toughness was achieved by the macrostructures, which
enhanced the effective cleavage of sacrificial bonds between the carboxyl
groups and titania.
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