Preparation of needle-like poly(azomethine) crystals by means of reaction-induced crystallization of oligomers

✍ Scribed by Kunio Kimura; Jin-Huang Zhuang; Kohtaro Shirabe; Yuhiko Yamashita

• Book ID: 104163836
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 395 KB
• Volume: 44
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/s0032-3861(03)00448-8

✦ Synopsis

Needle-like poly(azomethine) crystals were successfully prepared by the polycondensation of 1,4-phenylenediamine and 1,4terephthalaldehyde in liquid paraffin at 180 8C. The favorable polymerization concentration for the preparation of the well-defined needle-like crystals was 2.0 £ 10 22 mol l 21 . The average length and width of the needle-like crystals were 7.7 and 0.6 mm, respectively. These crystals possessed high crystallinity and good thermal stability. The extended polymer chains were aligned along the long axis of the needle-like crystal. The morphological observations indicated that the needle-like crystals were formed through the spiral growth of the oligomer lamellae caused by the screw dislocation.