Abstract
AbstractExposure of crystals of the thermochromic polydiacetylene (PDA) of the bis(ethylurethane) of 5,7‐dodecadiyne‐1,12‐diol (ETCD) to the hot solvents chlorobenzene and N,N‐dimethylformamide results in the conversion of the material to a nonthermochromic form. The material resulting from chlorobenzene extraction retains its original shape and is crystalline. It was further characterized by differential scanning calorimetry, X‐ray powder diffraction, and Raman spectroscopy. Significant amounts of chlorobenzene are not retained in the extracted material. It is indicated that chlorobenzene extracts monomer and oligomer causing expansion of the lattice, some disordering of the polymer chains, and removal of the interactions which allow observation of thermochromism. The implications of these findings for the role of possible mechanical strains in the crystal structure‐thermochromism relationship in urethane‐substituted PDA crystals are discussed.
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