Novel network morphology of poly(p-oxybenzoyl) (pages 1624–1634)
Kunio Kimura, Shin-ichiro Kohama, Satomi Kondoh, Tetsuya Uchida, Yuhiko Yamashita, Takeshi Oohazama and Yoshimitsu Sakaguchi
Version of Record online: 4 MAR 2005 | DOI: 10.1002/pola.20639
A novel network structure of poly(p-oxybenzoyl) was successfully prepared by the polymerization of 4-acetoxybenzoic acid with 3,5-diacetoxybenzoic acid at a concentration in the feed (χf) of 0.10–0.15. Polymerizations were carried out at a concentration of 1.0% in an aromatic solvent at 320 °C. The network structure was comprised of spheres connected by fibrillar crystals and possessed high crystallinity. Co-oligomers were first precipitated in the beginning of the polymerization by liquid–liquid phase separation to form microdroplets. The fibrillar crystals were formed in the coalesced spheres by the crystallization of oligomers. The fibrillar crystals connecting the spheres gradually appeared owing to the shrinkage of the spheres. The fibrillar crystals grew from the surface of the spheres with the crystallization of homo-oligomers of 4-oxybenzoyl units, and finally the network structure was completed.