Composition control of aromatic copolyesters by shearing

Kunio Kimura, Toshimitsu Ichimori, Kanji Wakabayashi, Shin Ichiro Kohama, Shinichi Yamazaki

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Composition control of copolyester was examined by using hydrodynarnically induced phase separation, during solution polymerization, of p-acetoxybenzoic acid and m-acetoxybenzoic acid (m-ABA). Polymerizations were carried out in liquid paraffin at 1.0% of concentration under shear flow. The polymers were obtained as precipitates formed via phase separation of oligomers and the subsequent polymerization in the precipitates. When the feed ratio of m-ABA (χf) was 20 mol %, the molar ratio of m-oxybenzoyl moiety in the precipitated polymers (χp) was 5.3, 3.1, and 2.3 mol % at a shear rate (γ) of 0, 147, and 489 s-1, respectively. The values of χp were much lower than those of χf, and shear flow lowered the value of xp; thus, controlling shear flow influenced both the reaction rate of the monomers and the miscibility of the oligomers. It especially enhanced the difference on the miscibihty between homo-oligomers and co-oligomers. This change in the miscibility by shear flow brought about the more rapid precipitation of homo-oligomers than co-oligomers, leading to the selective formation of poly(p-oxybenzoyl).

Original languageEnglish
Pages (from-to)4193-4199
Number of pages7
JournalMacromolecules
Volume41
Issue number12
DOIs
Publication statusPublished - Jun 24 2008

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Shearing
Oligomers
Shear flow
Chemical analysis
Polymerization
Phase separation
Acids
Precipitates
Polymers
Solubility
Mineral Oil
Paraffins
Shear deformation
Reaction rates
Monomers
Liquids

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Composition control of aromatic copolyesters by shearing. / Kimura, Kunio; Ichimori, Toshimitsu; Wakabayashi, Kanji; Kohama, Shin Ichiro; Yamazaki, Shinichi.

In: Macromolecules, Vol. 41, No. 12, 24.06.2008, p. 4193-4199.

Research output: Contribution to journalArticle

Kimura, K, Ichimori, T, Wakabayashi, K, Kohama, SI & Yamazaki, S 2008, 'Composition control of aromatic copolyesters by shearing', Macromolecules, vol. 41, no. 12, pp. 4193-4199. https://doi.org/10.1021/ma800529d
Kimura, Kunio ; Ichimori, Toshimitsu ; Wakabayashi, Kanji ; Kohama, Shin Ichiro ; Yamazaki, Shinichi. / Composition control of aromatic copolyesters by shearing. In: Macromolecules. 2008 ; Vol. 41, No. 12. pp. 4193-4199.
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