Abstract
Polymerization of 4-acetoxybenzoic acid (ABA) with 3,5-diacetoxybenzoic acid (DABA) was examined to control the morphology of poly(p-oxybenzoyl) (POB). Polymerizations were carried out at a concentration of 1.0% in an aromatic solvent Therm S-1000® (mixture of dibenzyltoluene) at 320°C. Polymerization of ABA yielded the POB fibrillar crystals, but the polymerization with DABA at a concentration in the feed (χf) of 0.10-0.15 afforded novel network structures comprised of spheres connected by fibrillar crystals. The diameter of the spheres prepared at χf of 0.15, which were 0.7 and 5.0 μm, showed bimodality. The network distance, fibril length, and fibril width were 6.1, 2.6, and 0.1 μm, respectively. They possessed high crystallinity. The network structure was formed as follows. Co-oligomers were first precipitated in the beginning of the polymerization by liquid-liquid phase separation to form the microdroplets. The fibrillar crystals were formed in the coalesced spheres by the crystallization of oligomers induced by the increase of molecular weight. 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.
| Original language | English |
|---|---|
| Pages (from-to) | 1624-1634 |
| Number of pages | 11 |
| Journal | Journal of Polymer Science, Part A: Polymer Chemistry |
| Volume | 43 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Apr 15 2005 |
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Keywords
- Morphology
- Networks
- Phase separation
- Polycondensation
- Polyesters
ASJC Scopus subject areas
- Polymers and Plastics
- Materials Chemistry
Cite this
Novel network morphology of poly(p-oxybenzoyl). / Kimura, Kunio; Kohama, Shin Ichiro; Kondoh, Satomi; Uchida, Tetsuya; Yamashita, Yuhiko; Oohazama, Takeshi; Sakaguchi, Yoshimitsu.
In: Journal of Polymer Science, Part A: Polymer Chemistry, Vol. 43, No. 8, 15.04.2005, p. 1624-1634.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Novel network morphology of poly(p-oxybenzoyl)
AU - Kimura, Kunio
AU - Kohama, Shin Ichiro
AU - Kondoh, Satomi
AU - Uchida, Tetsuya
AU - Yamashita, Yuhiko
AU - Oohazama, Takeshi
AU - Sakaguchi, Yoshimitsu
PY - 2005/4/15
Y1 - 2005/4/15
N2 - Polymerization of 4-acetoxybenzoic acid (ABA) with 3,5-diacetoxybenzoic acid (DABA) was examined to control the morphology of poly(p-oxybenzoyl) (POB). Polymerizations were carried out at a concentration of 1.0% in an aromatic solvent Therm S-1000® (mixture of dibenzyltoluene) at 320°C. Polymerization of ABA yielded the POB fibrillar crystals, but the polymerization with DABA at a concentration in the feed (χf) of 0.10-0.15 afforded novel network structures comprised of spheres connected by fibrillar crystals. The diameter of the spheres prepared at χf of 0.15, which were 0.7 and 5.0 μm, showed bimodality. The network distance, fibril length, and fibril width were 6.1, 2.6, and 0.1 μm, respectively. They possessed high crystallinity. The network structure was formed as follows. Co-oligomers were first precipitated in the beginning of the polymerization by liquid-liquid phase separation to form the microdroplets. The fibrillar crystals were formed in the coalesced spheres by the crystallization of oligomers induced by the increase of molecular weight. 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.
AB - Polymerization of 4-acetoxybenzoic acid (ABA) with 3,5-diacetoxybenzoic acid (DABA) was examined to control the morphology of poly(p-oxybenzoyl) (POB). Polymerizations were carried out at a concentration of 1.0% in an aromatic solvent Therm S-1000® (mixture of dibenzyltoluene) at 320°C. Polymerization of ABA yielded the POB fibrillar crystals, but the polymerization with DABA at a concentration in the feed (χf) of 0.10-0.15 afforded novel network structures comprised of spheres connected by fibrillar crystals. The diameter of the spheres prepared at χf of 0.15, which were 0.7 and 5.0 μm, showed bimodality. The network distance, fibril length, and fibril width were 6.1, 2.6, and 0.1 μm, respectively. They possessed high crystallinity. The network structure was formed as follows. Co-oligomers were first precipitated in the beginning of the polymerization by liquid-liquid phase separation to form the microdroplets. The fibrillar crystals were formed in the coalesced spheres by the crystallization of oligomers induced by the increase of molecular weight. 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.
KW - Morphology
KW - Networks
KW - Phase separation
KW - Polycondensation
KW - Polyesters
UR - http://www.scopus.com/inward/record.url?scp=17644411988&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=17644411988&partnerID=8YFLogxK
U2 - 10.1002/pola.20639
DO - 10.1002/pola.20639
M3 - Article
VL - 43
SP - 1624
EP - 1634
JO - Journal of Polymer Science, Part A: Polymer Chemistry
JF - Journal of Polymer Science, Part A: Polymer Chemistry
SN - 0887-624X
IS - 8
ER -