Size control of aromatic polyamide hollow spheres prepared by reaction-induced phase separation

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Size control of the poly (1,4-phenylene-5-hydroxyisophthalamide) hollow spheres was examined by tuning the polymerization condition, focusing on concentration, temperature and solvent. Higher concentration lowered the diameter owing to the higher degree of super-saturation for nucleation. Temperature drop during the polymerization just before the nucleation was so effective to make the diameter smaller. Moreover, the diameter was susceptive to the solubility of oligomers in the solvent, and higher content of liquid paraffin in the aromatic solvent lowered the solubility, resulting in the decrease in the diameter. Based on these results, the combination of the temperature drop and the solvent effect was the most desirable to prepare the smallest hollow spheres, and the diameter of hollow spheres could be controlled from 4.4 to 0.7 μm.

Original languageEnglish
Pages (from-to)239-243
Number of pages5
JournalPolymer (United Kingdom)
Volume111
DOIs
Publication statusPublished - Feb 24 2017

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Nylons
Polyamides
Phase separation
Nucleation
Solubility
Polymerization
Mineral Oil
Supersaturation
Oligomers
Paraffins
Temperature
Tuning
Liquids

Keywords

  • Morphology
  • Phase behavior
  • Polyamides
  • Polycondensation
  • Porous materials

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry

Cite this

Size control of aromatic polyamide hollow spheres prepared by reaction-induced phase separation. / Nakayama, Hirofumi; Adachi, Naoto; Atarashi, Hironori; Uchida, Tetsuya; Yamazaki, Shinichi; Kimura, Kunio.

In: Polymer (United Kingdom), Vol. 111, 24.02.2017, p. 239-243.

Research output: Contribution to journalArticle

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AU - Nakayama, Hirofumi

AU - Adachi, Naoto

AU - Atarashi, Hironori

AU - Uchida, Tetsuya

AU - Yamazaki, Shinichi

AU - Kimura, Kunio

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N2 - Size control of the poly (1,4-phenylene-5-hydroxyisophthalamide) hollow spheres was examined by tuning the polymerization condition, focusing on concentration, temperature and solvent. Higher concentration lowered the diameter owing to the higher degree of super-saturation for nucleation. Temperature drop during the polymerization just before the nucleation was so effective to make the diameter smaller. Moreover, the diameter was susceptive to the solubility of oligomers in the solvent, and higher content of liquid paraffin in the aromatic solvent lowered the solubility, resulting in the decrease in the diameter. Based on these results, the combination of the temperature drop and the solvent effect was the most desirable to prepare the smallest hollow spheres, and the diameter of hollow spheres could be controlled from 4.4 to 0.7 μm.

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