Morphology and properties of rigid-rod poly(p-phenylene benzobisoxazole) (PBO) and stiff-chain poly(2,5(6)-benzoxazole) (ABPBO) fibres

Stephen Krause, T. B. Haddock, D. L. Vezie, P. G. Lenhert, W. F. Hwang, G. E. Price, T. E. Helminiak, J. F. O'Brien, W. W. Adams

Research output: Contribution to journalArticle

135 Citations (Scopus)

Abstract

The morphology of two new high performance polymer fibres, rigid-rod poly(p-phenylene benzobisoxazole) (PBO) and stiff-chain poly(2,5(6)-benzoxazole) (ABPBO), has been examined by wide angle X-ray scattering and scanning and transmission electron microscopy. Heat treatment of as-spun PBO and ABPBO fibres produces transversely broadened crystallites, which are unlike uniaxially elongated crystallites in heat treated fibres of rigid-rod poly(p-phenylene benzobisthiazole) (PBT) or stiff-chain Kevlar, i.e. poly(p-phenylene terephthalamide) (PPTA). Heat treated fibres of PBO have greater three-dimensional crystallinity and long range crystallite ordering than axially disordered PBT, but much less than well ordered PPTA. Fibres of both as-spun and heat treated PBO have a crystalline c-axis with high orientation and low paracrystalline disorder, but heat treatment of as-spun fibres of ABPBO significantly increases c-axis orientation and decreases c-axis paracrystallinity, due to additional extension of the stiff-chain ABPBO molecules. Eventual improvements in orientation and ordering of PBO fibre through improvements in synthesis and processing may, based upon theoretically predicted values, result in up to triple the strength and modulus of commercial PPTA fibre.

Original languageEnglish (US)
Pages (from-to)1354-1364
Number of pages11
JournalPolymer
Volume29
Issue number8
DOIs
StatePublished - 1988

Fingerprint

Benzoxazoles
Fibers
Crystallites
Heat treatment
poly-para-phenylene
X ray scattering
Crystal orientation
Polymers
Crystalline materials
Transmission electron microscopy

Keywords

  • electron microscopy
  • morphology
  • poly(2,5(6)-benzoxazole)
  • poly(p-phenylene benzobisoxazole
  • tensile modulus
  • wide angle X-ray scattering

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Morphology and properties of rigid-rod poly(p-phenylene benzobisoxazole) (PBO) and stiff-chain poly(2,5(6)-benzoxazole) (ABPBO) fibres. / Krause, Stephen; Haddock, T. B.; Vezie, D. L.; Lenhert, P. G.; Hwang, W. F.; Price, G. E.; Helminiak, T. E.; O'Brien, J. F.; Adams, W. W.

In: Polymer, Vol. 29, No. 8, 1988, p. 1354-1364.

Research output: Contribution to journalArticle

Krause, S, Haddock, TB, Vezie, DL, Lenhert, PG, Hwang, WF, Price, GE, Helminiak, TE, O'Brien, JF & Adams, WW 1988, 'Morphology and properties of rigid-rod poly(p-phenylene benzobisoxazole) (PBO) and stiff-chain poly(2,5(6)-benzoxazole) (ABPBO) fibres', Polymer, vol. 29, no. 8, pp. 1354-1364. https://doi.org/10.1016/0032-3861(88)90297-2
Krause, Stephen ; Haddock, T. B. ; Vezie, D. L. ; Lenhert, P. G. ; Hwang, W. F. ; Price, G. E. ; Helminiak, T. E. ; O'Brien, J. F. ; Adams, W. W. / Morphology and properties of rigid-rod poly(p-phenylene benzobisoxazole) (PBO) and stiff-chain poly(2,5(6)-benzoxazole) (ABPBO) fibres. In: Polymer. 1988 ; Vol. 29, No. 8. pp. 1354-1364.
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abstract = "The morphology of two new high performance polymer fibres, rigid-rod poly(p-phenylene benzobisoxazole) (PBO) and stiff-chain poly(2,5(6)-benzoxazole) (ABPBO), has been examined by wide angle X-ray scattering and scanning and transmission electron microscopy. Heat treatment of as-spun PBO and ABPBO fibres produces transversely broadened crystallites, which are unlike uniaxially elongated crystallites in heat treated fibres of rigid-rod poly(p-phenylene benzobisthiazole) (PBT) or stiff-chain Kevlar, i.e. poly(p-phenylene terephthalamide) (PPTA). Heat treated fibres of PBO have greater three-dimensional crystallinity and long range crystallite ordering than axially disordered PBT, but much less than well ordered PPTA. Fibres of both as-spun and heat treated PBO have a crystalline c-axis with high orientation and low paracrystalline disorder, but heat treatment of as-spun fibres of ABPBO significantly increases c-axis orientation and decreases c-axis paracrystallinity, due to additional extension of the stiff-chain ABPBO molecules. Eventual improvements in orientation and ordering of PBO fibre through improvements in synthesis and processing may, based upon theoretically predicted values, result in up to triple the strength and modulus of commercial PPTA fibre.",
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AU - Vezie, D. L.

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AU - Hwang, W. F.

AU - Price, G. E.

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AU - O'Brien, J. F.

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AB - The morphology of two new high performance polymer fibres, rigid-rod poly(p-phenylene benzobisoxazole) (PBO) and stiff-chain poly(2,5(6)-benzoxazole) (ABPBO), has been examined by wide angle X-ray scattering and scanning and transmission electron microscopy. Heat treatment of as-spun PBO and ABPBO fibres produces transversely broadened crystallites, which are unlike uniaxially elongated crystallites in heat treated fibres of rigid-rod poly(p-phenylene benzobisthiazole) (PBT) or stiff-chain Kevlar, i.e. poly(p-phenylene terephthalamide) (PPTA). Heat treated fibres of PBO have greater three-dimensional crystallinity and long range crystallite ordering than axially disordered PBT, but much less than well ordered PPTA. Fibres of both as-spun and heat treated PBO have a crystalline c-axis with high orientation and low paracrystalline disorder, but heat treatment of as-spun fibres of ABPBO significantly increases c-axis orientation and decreases c-axis paracrystallinity, due to additional extension of the stiff-chain ABPBO molecules. Eventual improvements in orientation and ordering of PBO fibre through improvements in synthesis and processing may, based upon theoretically predicted values, result in up to triple the strength and modulus of commercial PPTA fibre.

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