Lattice imaging of HBA-HNA non-periodic layer crystals

✍ Scribed by C.J.G. Plummer; H.-H. Kausch

• Book ID: 104164579
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 499 KB
• Volume: 38
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/s0032-3861(96)00904-4

✦ Synopsis

Solution cast thin films of the Vectra RM HBA-HNA thermotropic liquid crystalline random copolymer, annealed for 1 h at 240°C have been investigated by HREM. Non-periodic layer crystals were observed with the c* direction lying in, or close to the plane of the films, with crystalline core widths of about 10 nm. Lattice fringes werre obtained from the 1 1 0 and 2 0 0 planes of the orthorhombic unit cell, and from the first of the non-periodic meridional maxima of the fibre diffraction pattern, these latter extending over the whole of the core widths. ~