Abstract
The crystals of 5,7-dodecadiyne-1,12-diol bis[phenylcarbamate] (TCDU) with the two different structures, TCDU-1 and TCDU-2, were grown from TCDU-acetone solution by controlling the rate of evaporation of solvent. The monomer crystals with the two different structures polymerize selectively into different phases of polymer crystals: TCDU-1 into B-phase, and TCDU-2 into A-phase. Studies of thermally-induced phase transition of polymerized crystals have revealed a reversible A-B phase transition at 393 K in A-phase crystals polymerized from TCDU-2. However, it has also been shown that the phase transition is not induced thermally in B-phase crystals polymerized from TCDU-1 at any temperatures from 7 to 450 K. These results are discussed on the basis of the current structural model of A and B phases of polydiacetylene crystals.
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