Fabrication of poly(p-oxycinnamoyl) needle crystals by using hydrodynamically induced crystallization during solution polymerization

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 languageEnglish
Title of host publicationPolymer Preprints, Japan
Pages600
Number of pages1
Volume54
Edition1
Publication statusPublished - 2005
Event54th SPSJ Annual Meeting 2005 - Yokohama, Japan
Duration: May 25 2005May 27 2005

Other

Other54th SPSJ Annual Meeting 2005
CountryJapan
CityYokohama
Period5/25/055/27/05

Fingerprint

Needles
Crystallization
Polymerization
Fabrication
Crystals
Microspheres
Acids
Liquids
Polycondensation
Laminar flow
Oligomers
Phase separation
Vortex flow

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 proceedingConference contribution

Muraoka, M, Yamazaki, S & Kimura, K 2005, Fabrication of poly(p-oxycinnamoyl) needle crystals by using hydrodynamically induced crystallization during solution polymerization. in Polymer Preprints, Japan. 1 edn, vol. 54, pp. 600, 54th SPSJ Annual Meeting 2005, Yokohama, Japan, 5/25/05.
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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.

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KW - Polyester

KW - Stirring

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