The synthesis and characterization of poly(oxy-2,6-naphthalenediylcarbonyl) (PON) whiskers from 2-acetoxy-6-naphthoic acid are described. The important factors in controlling PON crystal morphologies during high-temperature solution polymerization are polarity of solvent, concentration of monomer and stirring. Less-polar solvents like liquid paraffin or Therm S 800, low concentration of monomer and no stirring are desirable for making PON whiskers. The size of the whisker prepared in liquid paraffin is 7-17#m in length and 0.5-1.0/1m in width. From its electron diffraction patterns, it was found that this whisker exhibits a single-crystal nature and the polymer chains align along the long axis of the whisker. Owing to the close packing of polymer chains in this crystal, the whisker has the highest thermal stability compared with the other fibrillar and slab-like crystals. The formation mechanism of PON whiskers is also investigated in comparison to that of poly(oxy-l,4-benzenediylcarbonyl) whiskers.
Посилання на статтю:
Synthesis and characterization of poly( oxy-2,6-n a p ht ha len ed iylca rbo nyl ) whiskers from 2-acetoxy-6-naphthoic acid / Kunio Kimura, Seiji Endo and Yasuo Kato // Polymer. – 1993. – Vol 34. – P. 1054-1059.