Abstract
Morphology control of poly(p-oxycinnamoyl) (POC) was studied to overcome the poor processability and microspheres were prepared by the self-organizing polycondensation of (E)-4-acetoxycinnamic acid (ACA) in aromatic solvent at 320°C without stirring. The work reported investigated the fabrication of POC needle crystals by hydrodynamically induced crystallization during polymerization of ACA. Polymerizations of ACA were carried out in a cylindrical vessel equipped with a stirring bar at a concentration of 1.5% under stirring with different speed (γ) of 300, 700 and 1100 rpm. Microspheres were obtained at γ of 300 rpm via liquid-liquid phase separation. In contrast to this, morphology was drastically changed from sphere to needle at γ of 700 and 1100 rpm These needle crystals were obtained with the yield of 22-27 %, which were 1.0-1.5 μm in length and 1.0-1.5 μm in width. The purely laminar flow in the cylindrical vessel at low stirring speed changed to Taylor vortices with the increase of γ and this brought about the huge concentration of oligomers along to the circular flow leading to the crystallization to form the needle crystals.
| Original language | English |
|---|---|
| Title of host publication | Polymer Preprints, Japan |
| Pages | 600 |
| Number of pages | 1 |
| Volume | 54 |
| Edition | 1 |
| Publication status | Published - 2005 |
| Event | 54th SPSJ Annual Meeting 2005 - Yokohama, Japan Duration: May 25 2005 → May 27 2005 |
Other
| Other | 54th SPSJ Annual Meeting 2005 |
|---|---|
| Country | Japan |
| City | Yokohama |
| Period | 5/25/05 → 5/27/05 |
Fingerprint
Keywords
- Crystallization
- Microsphere
- Needle crystal
- Polycondensation
- Polyester
- Stirring
ASJC Scopus subject areas
- Engineering(all)
Cite this
Fabrication of poly(p-oxycinnamoyl) needle crystals by using hydrodynamically induced crystallization during solution polymerization. / Muraoka, Mayuko; Yamazaki, Shinichi; Kimura, Kunio.
Polymer Preprints, Japan. Vol. 54 1. ed. 2005. p. 600.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Fabrication of poly(p-oxycinnamoyl) needle crystals by using hydrodynamically induced crystallization during solution polymerization
AU - Muraoka, Mayuko
AU - Yamazaki, Shinichi
AU - Kimura, Kunio
PY - 2005
Y1 - 2005
N2 - Morphology control of poly(p-oxycinnamoyl) (POC) was studied to overcome the poor processability and microspheres were prepared by the self-organizing polycondensation of (E)-4-acetoxycinnamic acid (ACA) in aromatic solvent at 320°C without stirring. The work reported investigated the fabrication of POC needle crystals by hydrodynamically induced crystallization during polymerization of ACA. Polymerizations of ACA were carried out in a cylindrical vessel equipped with a stirring bar at a concentration of 1.5% under stirring with different speed (γ) of 300, 700 and 1100 rpm. Microspheres were obtained at γ of 300 rpm via liquid-liquid phase separation. In contrast to this, morphology was drastically changed from sphere to needle at γ of 700 and 1100 rpm These needle crystals were obtained with the yield of 22-27 %, which were 1.0-1.5 μm in length and 1.0-1.5 μm in width. The purely laminar flow in the cylindrical vessel at low stirring speed changed to Taylor vortices with the increase of γ and this brought about the huge concentration of oligomers along to the circular flow leading to the crystallization to form the needle crystals.
AB - Morphology control of poly(p-oxycinnamoyl) (POC) was studied to overcome the poor processability and microspheres were prepared by the self-organizing polycondensation of (E)-4-acetoxycinnamic acid (ACA) in aromatic solvent at 320°C without stirring. The work reported investigated the fabrication of POC needle crystals by hydrodynamically induced crystallization during polymerization of ACA. Polymerizations of ACA were carried out in a cylindrical vessel equipped with a stirring bar at a concentration of 1.5% under stirring with different speed (γ) of 300, 700 and 1100 rpm. Microspheres were obtained at γ of 300 rpm via liquid-liquid phase separation. In contrast to this, morphology was drastically changed from sphere to needle at γ of 700 and 1100 rpm These needle crystals were obtained with the yield of 22-27 %, which were 1.0-1.5 μm in length and 1.0-1.5 μm in width. The purely laminar flow in the cylindrical vessel at low stirring speed changed to Taylor vortices with the increase of γ and this brought about the huge concentration of oligomers along to the circular flow leading to the crystallization to form the needle crystals.
KW - Crystallization
KW - Microsphere
KW - Needle crystal
KW - Polycondensation
KW - Polyester
KW - Stirring
UR - http://www.scopus.com/inward/record.url?scp=33645580271&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33645580271&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33645580271
VL - 54
SP - 600
BT - Polymer Preprints, Japan
ER -