A series of urethane-substituted polydiacetylenes (PDA-mUEt) with different alkyl chain lengths (m=4, 5, and 6) in side chain substituents of (CH 2 ) m OCONHC 2 H 5 were synthesized. The effect of the alkyl chain length on the thermochromic phase transition was investigated by measurements of reflectance spectra for the PDA-mUEt crystals. The thermochromic phase transition...
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