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

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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