유사한 메소게닉 단위와 격자의 교대서열을 가지는 주사슬 중합체에 대한 모형화합물

Model compounds for main-chainpolymers having alternating sequences of similar mesogenic units and spacers

Two series of main chain liquid crystalline polymers consisting of aromatic Schiff-base mesogenic units and polymethylene spacers were synthesized and their thermal transitions and liquid crystalline properties were studied. And a series of dimesogenic compounds having two identical, terminal Schiff-base type mesogens and a central polymethylene spacer were prepared and their thermal transitions and liquid crystalline properties were compaerd with those of the corresponding monomesogenic compounds. The mesomorphic properties of the polymers and the compounds were studied by differential scanning calorimetry and on a hot-stage of a polarizing microscope.