Morphology control of various aromatic polyimides by using phase separation during polymerization

Kanji Wakabayashi, Shin ichiro Kohama, Shinichi Yamazaki, Kunio Kimura

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Morphology control of various aromatic polyimides representative as poly(4,4′-oxydiphenylene pyromelliteimide) was examined by using the phase separation during solution polymerization. Polymerizations of aromatic dianhydrides and aromatic diamines to the polyimides were carried out in poor solvents at 240-330 °C for 6 h with no stirring. Polymerization concentrations were from 0.25% to 3.0%. The polyimides were obtained as yellow precipitates. Two categorized morphologies were created, which were particles and crystals exhibiting lath-like and plate-like habits. These morphologies of polyimides could be selectively controlled by the polymerization conditions. The higher concentrations, less miscible solvents and lower temperatures were preferable to yield the particles via liquid-liquid phase separation. On the contrary, the lower concentration, miscible solvents and higher temperature were desirable to yield the crystals. The polyimide precipitates showed high crystallinity and possessed excellent thermal stability at which the 10 wt% loss temperatures in N2 were in the range of 590-694 °C.

Original languageEnglish
Pages (from-to)458-466
Number of pages9
JournalPolymer
Volume48
Issue number2
DOIs
Publication statusPublished - Jan 12 2007

Fingerprint

Polyimides
Phase separation
Polymerization
Precipitates
Crystals
Diamines
Liquids
Temperature
Thermodynamic stability

Keywords

  • Morphology
  • Phase separation
  • Polyimide

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Morphology control of various aromatic polyimides by using phase separation during polymerization. / Wakabayashi, Kanji; Kohama, Shin ichiro; Yamazaki, Shinichi; Kimura, Kunio.

In: Polymer, Vol. 48, No. 2, 12.01.2007, p. 458-466.

Research output: Contribution to journalArticle

@article{d306957fa53a4c3abfa99a55ffdb194c,
title = "Morphology control of various aromatic polyimides by using phase separation during polymerization",
abstract = "Morphology control of various aromatic polyimides representative as poly(4,4′-oxydiphenylene pyromelliteimide) was examined by using the phase separation during solution polymerization. Polymerizations of aromatic dianhydrides and aromatic diamines to the polyimides were carried out in poor solvents at 240-330 °C for 6 h with no stirring. Polymerization concentrations were from 0.25{\%} to 3.0{\%}. The polyimides were obtained as yellow precipitates. Two categorized morphologies were created, which were particles and crystals exhibiting lath-like and plate-like habits. These morphologies of polyimides could be selectively controlled by the polymerization conditions. The higher concentrations, less miscible solvents and lower temperatures were preferable to yield the particles via liquid-liquid phase separation. On the contrary, the lower concentration, miscible solvents and higher temperature were desirable to yield the crystals. The polyimide precipitates showed high crystallinity and possessed excellent thermal stability at which the 10 wt{\%} loss temperatures in N2 were in the range of 590-694 °C.",
keywords = "Morphology, Phase separation, Polyimide",
author = "Kanji Wakabayashi and Kohama, {Shin ichiro} and Shinichi Yamazaki and Kunio Kimura",
year = "2007",
month = "1",
day = "12",
doi = "10.1016/j.polymer.2006.11.061",
language = "English",
volume = "48",
pages = "458--466",
journal = "Polymer",
issn = "0032-3861",
publisher = "Elsevier BV",
number = "2",

}

TY - JOUR

T1 - Morphology control of various aromatic polyimides by using phase separation during polymerization

AU - Wakabayashi, Kanji

AU - Kohama, Shin ichiro

AU - Yamazaki, Shinichi

AU - Kimura, Kunio

PY - 2007/1/12

Y1 - 2007/1/12

N2 - Morphology control of various aromatic polyimides representative as poly(4,4′-oxydiphenylene pyromelliteimide) was examined by using the phase separation during solution polymerization. Polymerizations of aromatic dianhydrides and aromatic diamines to the polyimides were carried out in poor solvents at 240-330 °C for 6 h with no stirring. Polymerization concentrations were from 0.25% to 3.0%. The polyimides were obtained as yellow precipitates. Two categorized morphologies were created, which were particles and crystals exhibiting lath-like and plate-like habits. These morphologies of polyimides could be selectively controlled by the polymerization conditions. The higher concentrations, less miscible solvents and lower temperatures were preferable to yield the particles via liquid-liquid phase separation. On the contrary, the lower concentration, miscible solvents and higher temperature were desirable to yield the crystals. The polyimide precipitates showed high crystallinity and possessed excellent thermal stability at which the 10 wt% loss temperatures in N2 were in the range of 590-694 °C.

AB - Morphology control of various aromatic polyimides representative as poly(4,4′-oxydiphenylene pyromelliteimide) was examined by using the phase separation during solution polymerization. Polymerizations of aromatic dianhydrides and aromatic diamines to the polyimides were carried out in poor solvents at 240-330 °C for 6 h with no stirring. Polymerization concentrations were from 0.25% to 3.0%. The polyimides were obtained as yellow precipitates. Two categorized morphologies were created, which were particles and crystals exhibiting lath-like and plate-like habits. These morphologies of polyimides could be selectively controlled by the polymerization conditions. The higher concentrations, less miscible solvents and lower temperatures were preferable to yield the particles via liquid-liquid phase separation. On the contrary, the lower concentration, miscible solvents and higher temperature were desirable to yield the crystals. The polyimide precipitates showed high crystallinity and possessed excellent thermal stability at which the 10 wt% loss temperatures in N2 were in the range of 590-694 °C.

KW - Morphology

KW - Phase separation

KW - Polyimide

UR - http://www.scopus.com/inward/record.url?scp=33845951200&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33845951200&partnerID=8YFLogxK

U2 - 10.1016/j.polymer.2006.11.061

DO - 10.1016/j.polymer.2006.11.061

M3 - Article

AN - SCOPUS:33845951200

VL - 48

SP - 458

EP - 466

JO - Polymer

JF - Polymer

SN - 0032-3861

IS - 2

ER -