Direct synthesis of polyamides by using crystallization during polymerization

Kentaro Kobayashi, Shinichi Yamazaki, Kunio Kimura

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

Abstract

Direct polycondensations of isophthalic acid (IPA) and p-phenylenediamine (PPDA) were carried out by means of reaction-induced crystallization of oligomers. Poly(p-phenylene isophthalamide) (PPIA) plate-like crystals were obtained in good yield. The crystals exhibiting clear habits possessed high crystallinity. PPDA / IPA = 1.4 - 1.5 gave the highest intrinsic viscosity ([η]) of 0.37 dl/g. The yield and [η] of the polymers and the dissolved oligomers were measured in the course of the polymerization in order to examine polycondenastion feature. [η] of the polymers was increased even after the polymer yield was leveled off. On the other hand, [η] of the dissolved oligomers was constant through the polymerization. From these results, it was concluded that the polycondensation of IPA and PPDA proceeded as follows. When the molecular weight of oligomers exceeded the critical value, they were crystallized to form crystals. Solid-state polycondensation subsequently occurred in the crystals. Finally, PPIA were obtained as a form of crystals.

Original languageEnglish
Title of host publicationPolymer Preprints, Japan
Pages304
Number of pages1
Volume54
Edition1
Publication statusPublished - 2005
Event54th SPSJ Annual Meeting 2005 - Yokohama, Japan
Duration: May 25 2005May 27 2005

Other

Other54th SPSJ Annual Meeting 2005
CountryJapan
CityYokohama
Period5/25/055/27/05

Fingerprint

Polyamides
Oligomers
Crystallization
Polymerization
Polycondensation
Crystals
Acids
Polymers
Molecular weight
Viscosity

Keywords

  • Aromatic Polyamide
  • Crystallization
  • Direct Polycondensation
  • Oligomer
  • Poly(p-phenylene isophthalamide)

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Kobayashi, K., Yamazaki, S., & Kimura, K. (2005). Direct synthesis of polyamides by using crystallization during polymerization. In Polymer Preprints, Japan (1 ed., Vol. 54, pp. 304)

Direct synthesis of polyamides by using crystallization during polymerization. / Kobayashi, Kentaro; Yamazaki, Shinichi; Kimura, Kunio.

Polymer Preprints, Japan. Vol. 54 1. ed. 2005. p. 304.

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

Kobayashi, K, Yamazaki, S & Kimura, K 2005, Direct synthesis of polyamides by using crystallization during polymerization. in Polymer Preprints, Japan. 1 edn, vol. 54, pp. 304, 54th SPSJ Annual Meeting 2005, Yokohama, Japan, 5/25/05.
Kobayashi K, Yamazaki S, Kimura K. Direct synthesis of polyamides by using crystallization during polymerization. In Polymer Preprints, Japan. 1 ed. Vol. 54. 2005. p. 304
Kobayashi, Kentaro ; Yamazaki, Shinichi ; Kimura, Kunio. / Direct synthesis of polyamides by using crystallization during polymerization. Polymer Preprints, Japan. Vol. 54 1. ed. 2005. pp. 304
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