화학공학소재연구정보센터
Polymer, Vol.38, No.17, 4387-4399, 1997
Lamellar Macrocrystals of Nascent Liquid-Crystal Polymers
Large (up to 0.5 mm) single crystals of two liquid crystalline polymers, poly(p-oxybenzoate) (PpOBA) and the presumably random copolymer poly(m-oxybenzoate/2,6-oxynaphthoate) (1/1) [P(mOBA/ONA)], have been grown by the confined thin film melt polymerization technique at 180-200 degrees C. These large, thick ’macro’ crystals, as well as single disclination domains, form in regions in which the ’monomer melt’ spans the gap between the confining surfaces; when the ’melt’ only wets one of the surfaces thin, small crystals and single disclination domains are formed, as reported previously. When reheated to the polymerization temperature the copolymer disclination domains appear to revert to the liquid crystal state. The macrocrystals transform at the higher, 275 degrees C d.s.c. measured Tk-m of the copolymer. All of these structures, however, are composed of ca. 100 Angstrom thick lamellae for the growth conditions used. FTi.r. microscopy confirms the copolymer nature of the P(mOBA/ONA) samples.