Fig. 1. Several typical phenyl isothiocyanate liquid crystal compounds

Fig. 2. Time-dependent birefringence under two heat treatment conditions（100 ℃，normal environment and sealed environment）.

Fig. 3. Chemical reaction of phenyl isothiocyanate with nucleophilic reagent

Fig. 4. HPLC spectra of benzyl isothiocyanate methanol solution at different reaction times

Fig. 5. Mass spectrum of phenyl isothiocyanate compound solution after 72 h reaction