Influence of shearing on fractutional polycondensation of aromatic polyester

Chie Iwado, Toshimitsu Ichmori, Shinichi Yamazaki, Kunio Kimura

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

Abstract

Selective preparation of poly(p-oxybenzoyl) (POB) in copolymerization system of p-acetoxybenzoic acid (p-ABA) and m-acetoxybenzoic acid (m-ABA) was examined by using reaction-induced crystallization under shearing condition. POB crystals were mainly precipitated in liquid paraffin solution even at the content of m-ABA in feed (χf) of 30 mol% without stirring. In contrast to this, they were formed even at χf of 50 mol% and the fractionability was significantly enhanced by shearing. The mechanism of the fractional polycondensation was attributed to both the reactivity of monomer and the phase separation behavior of oligomer. Under shearing condition, the difference on the reactivity between p-ABA and m-ABA was lowered. However, the shearing induced the crystallization of homo-oligomers of p-oxybenzoyl unit more efficiently and prevented the precipitation of co-oligomers via crystallization. Thereby homo-oligomers were more rapidly and selectively precipitated by crystallization to form the POB crystals.

Original languageEnglish
Title of host publicationPolymer Preprints, Japan
Pages2679
Number of pages1
Volume54
Edition2
Publication statusPublished - 2005
Event54th SPSJ Symposium on Macromolecules - Yamagata, Japan
Duration: Sep 20 2005Sep 22 2005

Other

Other54th SPSJ Symposium on Macromolecules
CountryJapan
CityYamagata
Period9/20/059/22/05

Fingerprint

Polycondensation
Shearing
Polyesters
Oligomers
Crystallization
Acids
Crystals
Phase separation
Paraffins
Copolymerization
Monomers
Liquids

Keywords

  • Copolymerization
  • Crystallization
  • Fractionation
  • Polycondensation
  • Polyester
  • Shearing

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Iwado, C., Ichmori, T., Yamazaki, S., & Kimura, K. (2005). Influence of shearing on fractutional polycondensation of aromatic polyester. In Polymer Preprints, Japan (2 ed., Vol. 54, pp. 2679)

Influence of shearing on fractutional polycondensation of aromatic polyester. / Iwado, Chie; Ichmori, Toshimitsu; Yamazaki, Shinichi; Kimura, Kunio.

Polymer Preprints, Japan. Vol. 54 2. ed. 2005. p. 2679.

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

Iwado, C, Ichmori, T, Yamazaki, S & Kimura, K 2005, Influence of shearing on fractutional polycondensation of aromatic polyester. in Polymer Preprints, Japan. 2 edn, vol. 54, pp. 2679, 54th SPSJ Symposium on Macromolecules, Yamagata, Japan, 9/20/05.
Iwado C, Ichmori T, Yamazaki S, Kimura K. Influence of shearing on fractutional polycondensation of aromatic polyester. In Polymer Preprints, Japan. 2 ed. Vol. 54. 2005. p. 2679
Iwado, Chie ; Ichmori, Toshimitsu ; Yamazaki, Shinichi ; Kimura, Kunio. / Influence of shearing on fractutional polycondensation of aromatic polyester. Polymer Preprints, Japan. Vol. 54 2. ed. 2005. pp. 2679
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Y1 - 2005

N2 - Selective preparation of poly(p-oxybenzoyl) (POB) in copolymerization system of p-acetoxybenzoic acid (p-ABA) and m-acetoxybenzoic acid (m-ABA) was examined by using reaction-induced crystallization under shearing condition. POB crystals were mainly precipitated in liquid paraffin solution even at the content of m-ABA in feed (χf) of 30 mol% without stirring. In contrast to this, they were formed even at χf of 50 mol% and the fractionability was significantly enhanced by shearing. The mechanism of the fractional polycondensation was attributed to both the reactivity of monomer and the phase separation behavior of oligomer. Under shearing condition, the difference on the reactivity between p-ABA and m-ABA was lowered. However, the shearing induced the crystallization of homo-oligomers of p-oxybenzoyl unit more efficiently and prevented the precipitation of co-oligomers via crystallization. Thereby homo-oligomers were more rapidly and selectively precipitated by crystallization to form the POB crystals.

AB - Selective preparation of poly(p-oxybenzoyl) (POB) in copolymerization system of p-acetoxybenzoic acid (p-ABA) and m-acetoxybenzoic acid (m-ABA) was examined by using reaction-induced crystallization under shearing condition. POB crystals were mainly precipitated in liquid paraffin solution even at the content of m-ABA in feed (χf) of 30 mol% without stirring. In contrast to this, they were formed even at χf of 50 mol% and the fractionability was significantly enhanced by shearing. The mechanism of the fractional polycondensation was attributed to both the reactivity of monomer and the phase separation behavior of oligomer. Under shearing condition, the difference on the reactivity between p-ABA and m-ABA was lowered. However, the shearing induced the crystallization of homo-oligomers of p-oxybenzoyl unit more efficiently and prevented the precipitation of co-oligomers via crystallization. Thereby homo-oligomers were more rapidly and selectively precipitated by crystallization to form the POB crystals.

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