Analysis of the tensile modulus of poly(p-hydroxybenzoate)/poly(ethylene terephthalate)/poly(ethylene 2,6-naphthalate) ternary polyester composite fibers

Seung Goo Lee, Seong Hun Kim

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Liquid crystalline polymer reinforced plastics were prepared by compounding (PHB/PEN/PET) blends. A fibrillar PHB structure was formed in situ in the PEN/PET matrix under a high elongational flow field during melt-spinning of the composite fibers. The formation of PHB microfibrils in the composite fiber with different PHB contents and winding speeds was observed. The PHB microfibril reinforced PEN/PET composite fibers exhibited an unexpectedly low tensile modulus. We have evaluated the tensile modulus of the fibers using the non-modified22 and a modified 23 Halpin-Tsai model. From the analysis of both models, large differences were found between the theoretical and experimental values of the tensile modulus, and the low value of the tensile modulus of the composite fiber could not adequately be explained by either model. Thus, we analyzed the observed modulus values using the Takayanagi model,24 which describes the concept of mechanical discontinuities in semi-crystalline polymers. Using the Takayanagi model, the effective fraction of continuous or discontinuous microfibrils was evaluated. Consequently, we could successfully explain the very low modulus of the PHB/PEN/PET composite fiber, having a large number of PHB microfibrils, using the Takayanagi model.

Original languageEnglish
Pages (from-to)698-706
Number of pages9
JournalPolymer International
Volume52
Issue number5
DOIs
StatePublished - 2003 May 1

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Polyethylene Terephthalates
Polyesters
Polyethylene terephthalates
Ethylene
Elastic moduli
Fibers
Composite materials
Compounding (chemical)
Reinforced plastics
Melt spinning
Liquid crystal polymers
ethylene
4-hydroxybenzoic acid
Flow fields
Polymers
Crystalline materials

Keywords

  • Composite fiber
  • Liquid crystal polymer
  • Polyester
  • Tensile modulus

Cite this

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title = "Analysis of the tensile modulus of poly(p-hydroxybenzoate)/poly(ethylene terephthalate)/poly(ethylene 2,6-naphthalate) ternary polyester composite fibers",
abstract = "Liquid crystalline polymer reinforced plastics were prepared by compounding (PHB/PEN/PET) blends. A fibrillar PHB structure was formed in situ in the PEN/PET matrix under a high elongational flow field during melt-spinning of the composite fibers. The formation of PHB microfibrils in the composite fiber with different PHB contents and winding speeds was observed. The PHB microfibril reinforced PEN/PET composite fibers exhibited an unexpectedly low tensile modulus. We have evaluated the tensile modulus of the fibers using the non-modified22 and a modified 23 Halpin-Tsai model. From the analysis of both models, large differences were found between the theoretical and experimental values of the tensile modulus, and the low value of the tensile modulus of the composite fiber could not adequately be explained by either model. Thus, we analyzed the observed modulus values using the Takayanagi model,24 which describes the concept of mechanical discontinuities in semi-crystalline polymers. Using the Takayanagi model, the effective fraction of continuous or discontinuous microfibrils was evaluated. Consequently, we could successfully explain the very low modulus of the PHB/PEN/PET composite fiber, having a large number of PHB microfibrils, using the Takayanagi model.",
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author = "Lee, {Seung Goo} and Kim, {Seong Hun}",
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AU - Lee, Seung Goo

AU - Kim, Seong Hun

PY - 2003/5/1

Y1 - 2003/5/1

N2 - Liquid crystalline polymer reinforced plastics were prepared by compounding (PHB/PEN/PET) blends. A fibrillar PHB structure was formed in situ in the PEN/PET matrix under a high elongational flow field during melt-spinning of the composite fibers. The formation of PHB microfibrils in the composite fiber with different PHB contents and winding speeds was observed. The PHB microfibril reinforced PEN/PET composite fibers exhibited an unexpectedly low tensile modulus. We have evaluated the tensile modulus of the fibers using the non-modified22 and a modified 23 Halpin-Tsai model. From the analysis of both models, large differences were found between the theoretical and experimental values of the tensile modulus, and the low value of the tensile modulus of the composite fiber could not adequately be explained by either model. Thus, we analyzed the observed modulus values using the Takayanagi model,24 which describes the concept of mechanical discontinuities in semi-crystalline polymers. Using the Takayanagi model, the effective fraction of continuous or discontinuous microfibrils was evaluated. Consequently, we could successfully explain the very low modulus of the PHB/PEN/PET composite fiber, having a large number of PHB microfibrils, using the Takayanagi model.

AB - Liquid crystalline polymer reinforced plastics were prepared by compounding (PHB/PEN/PET) blends. A fibrillar PHB structure was formed in situ in the PEN/PET matrix under a high elongational flow field during melt-spinning of the composite fibers. The formation of PHB microfibrils in the composite fiber with different PHB contents and winding speeds was observed. The PHB microfibril reinforced PEN/PET composite fibers exhibited an unexpectedly low tensile modulus. We have evaluated the tensile modulus of the fibers using the non-modified22 and a modified 23 Halpin-Tsai model. From the analysis of both models, large differences were found between the theoretical and experimental values of the tensile modulus, and the low value of the tensile modulus of the composite fiber could not adequately be explained by either model. Thus, we analyzed the observed modulus values using the Takayanagi model,24 which describes the concept of mechanical discontinuities in semi-crystalline polymers. Using the Takayanagi model, the effective fraction of continuous or discontinuous microfibrils was evaluated. Consequently, we could successfully explain the very low modulus of the PHB/PEN/PET composite fiber, having a large number of PHB microfibrils, using the Takayanagi model.

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