Abstract
Polyimides are useful high-performance plastics, and their properties are strongly influenced by the morphology including molecular orientation The morphology control of polyimide is required to create structural materials and devices. This study provides the new procedure to control the morphology by using oligomer phase separation during solution polymerization in poor solvents. When the molecular weight of the oligomers exceeds a critical value, the oligomers are phase-separated through super-saturated state. If they are precipitated via crystallization, the crystals having high molecular weight are formed by the subsequent solid-state polymerization in the crystals, for instance, lozenge-shape crystals of poly(p-phenylene pyromelliteimide) (PPPI) and lath-like crystal of Kaptoa On the other hand, when they are precipitated via liquid-liquid phase separation, the microspheres of PPPI and other polyimides are obtained. The miscibility between oligomers and solvents is an important parameter to control the morphology.
| Original language | English |
|---|---|
| Title of host publication | Polymer Preprints, Japan |
| Pages | 76-78 |
| Number of pages | 3 |
| Volume | 55 |
| Edition | 1 |
| Publication status | Published - 2006 |
| Event | 55th SPSJ Annual Meeting - Nagoya, Japan Duration: May 24 2006 → May 26 2006 |
Other
| Other | 55th SPSJ Annual Meeting |
|---|---|
| Country | Japan |
| City | Nagoya |
| Period | 5/24/06 → 5/26/06 |
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Keywords
- Morphology
- Oligomer
- Phase separation
- Polyimide
ASJC Scopus subject areas
- Engineering(all)
Cite this
Morphology control of polyimides by using phase separation during polymerization. / Kimura, Kunio.
Polymer Preprints, Japan. Vol. 55 1. ed. 2006. p. 76-78.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Morphology control of polyimides by using phase separation during polymerization
AU - Kimura, Kunio
PY - 2006
Y1 - 2006
N2 - Polyimides are useful high-performance plastics, and their properties are strongly influenced by the morphology including molecular orientation The morphology control of polyimide is required to create structural materials and devices. This study provides the new procedure to control the morphology by using oligomer phase separation during solution polymerization in poor solvents. When the molecular weight of the oligomers exceeds a critical value, the oligomers are phase-separated through super-saturated state. If they are precipitated via crystallization, the crystals having high molecular weight are formed by the subsequent solid-state polymerization in the crystals, for instance, lozenge-shape crystals of poly(p-phenylene pyromelliteimide) (PPPI) and lath-like crystal of Kaptoa On the other hand, when they are precipitated via liquid-liquid phase separation, the microspheres of PPPI and other polyimides are obtained. The miscibility between oligomers and solvents is an important parameter to control the morphology.
AB - Polyimides are useful high-performance plastics, and their properties are strongly influenced by the morphology including molecular orientation The morphology control of polyimide is required to create structural materials and devices. This study provides the new procedure to control the morphology by using oligomer phase separation during solution polymerization in poor solvents. When the molecular weight of the oligomers exceeds a critical value, the oligomers are phase-separated through super-saturated state. If they are precipitated via crystallization, the crystals having high molecular weight are formed by the subsequent solid-state polymerization in the crystals, for instance, lozenge-shape crystals of poly(p-phenylene pyromelliteimide) (PPPI) and lath-like crystal of Kaptoa On the other hand, when they are precipitated via liquid-liquid phase separation, the microspheres of PPPI and other polyimides are obtained. The miscibility between oligomers and solvents is an important parameter to control the morphology.
KW - Morphology
KW - Oligomer
KW - Phase separation
KW - Polyimide
UR - http://www.scopus.com/inward/record.url?scp=33749683195&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33749683195&partnerID=8YFLogxK
M3 - Conference contribution
VL - 55
SP - 76
EP - 78
BT - Polymer Preprints, Japan
ER -