A multistep synthetic route for the preparation of a series of poly(oxy-l,4-phenyleneoxycarbonyl-l,4- phenyleneoxypolymethylene)s having a varying length of the polymethylene spacer from the di- to the hexamethylene group is reported. The polymers prepared were characterized particularly for their liquid crystalline properties by differential scanning calorimetry, wide-angle X-ray diffractometry and observation of their textures on a polarizing optical microscope. All the polymers, with the exception of the trimethylene polymer, formed the nematic phase in melt. They exhibited the well known odd-even effect at melting temperature as well as at isotropization temperature.
Посилання на статтю:
Synthesis and characterization of poly(oxy-1,4- phenyleneoxyca rbony1-1,4- phenyleneoxypolymethylene)s / Jung-II Jin*, Yong-II Cho, Byung-Hee Sohn and Chung-Seock Kang // Polymer. – 1993. – Vol 34. – P. 3019-3024.