Dumbbell-shaped Diacetylene Monomers for Physical Gelation and Its Topochemical Polymerization
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We newly designed and synthesized photopolymerizable dumbbell-shaped diacetylene liquid crystal monomers with dicarboxylic acid group at the center. These two kinds of monomers have chemically connected tails, such as amphiphilic biphenyl mesogens (abbreviated as BP3DA) and hydrophobic alkyl chains (abbreviated as AT3DA). For AT3DA, it is appropriate for the topochemical reaction because of the lateral adjacent molecular packing between diacetylene moieties. Despite of its highly ordered crystal phases of BP3DA, photopolymerization did not proceed. Because AT3DA formed the fibrous structure through hydrogen bonding, consequent photopolymerization stabilized the physical gel state via the covalently connected poly diacetylene network. Moreover, the AT3DA gel was readily changed from the reddish gel state to the orange sol state when the AT3DA gel was heated. This work was supported by the BK21 Plus, the BRL 2015042417, and Mid-Career Researcher Program (2016R1A2B2011041).