Self-organizing polycondensation of (E)-4-acetoxycinnamic acid for preparation of poly(p-oxycinnamoyl) microspheres

Kunio Kimura, Hiromasa Inoue, Shin Ichiro Kohama, Yuhiko Yamashita, Yoshimitsu Sakaguchi

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Preparation of poly(p-oxycinnamoyl) (POC) microspheres was examined by the reaction-induced phase separation of oligomers during the polycondensation of (E)-4-acetoxycinnamic acid in various solvents. Polymerization in liquid paraffin yielded the microspheres having a smooth surface at 270-330 °C, of which the average diameter was 4.6 μm. In contrast to this, the morphology of the products was drastically changed in Therm S 800 (TS8) and Therm S 900 (TS9) by polymerization temperature. When the polymerization was carried out at 310 °C in TS8 and 300 °C in TS9, the microspheres were obtained, of which the average diameter was 3.9 and 3.3 μm, respectively. The platelike crystals were formed under these temperatures, of which thickness was approximately 0.1 μm. The formation of the microspheres was highly related to the miscibility between the oligomers and the solvents. The average diameter of the microspheres increased with the decrease of the miscibility, and this tendency could be accounted for by the interfacial tension between two immiscible liquid phases. The microspheres were formed through the formation of the microdroplets by the liquid-liquid phase separation of the oligomers and the subsequent solidification of the microdroplets due to the further polymerization in them.

Original languageEnglish
Pages (from-to)7721-7729
Number of pages9
JournalMacromolecules
Volume36
Issue number20
DOIs
Publication statusPublished - Oct 7 2003

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Polycondensation
Microspheres
Acids
Polymerization
Oligomers
Liquids
Phase separation
Solubility
Mineral Oil
Paraffins
Surface tension
Solidification
Temperature
Crystals

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Self-organizing polycondensation of (E)-4-acetoxycinnamic acid for preparation of poly(p-oxycinnamoyl) microspheres. / Kimura, Kunio; Inoue, Hiromasa; Kohama, Shin Ichiro; Yamashita, Yuhiko; Sakaguchi, Yoshimitsu.

In: Macromolecules, Vol. 36, No. 20, 07.10.2003, p. 7721-7729.

Research output: Contribution to journalArticle

Kimura, Kunio ; Inoue, Hiromasa ; Kohama, Shin Ichiro ; Yamashita, Yuhiko ; Sakaguchi, Yoshimitsu. / Self-organizing polycondensation of (E)-4-acetoxycinnamic acid for preparation of poly(p-oxycinnamoyl) microspheres. In: Macromolecules. 2003 ; Vol. 36, No. 20. pp. 7721-7729.
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