Effect of viscosity ratio of the components of thermoplastic and liquid-crystalline polymer blends on the properties

E. Fekete, E. Földes, Zoltán Lengyel

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effects of viscosity ratio on the rheological and mechanical properties of the blends of four thermoplastics of low viscosity and a liquid crystalline polymer (LCP) were studied. A polyamide of reduced crystallinity (amorphous PA), a polycarbonate (PC), a polyethylene-terephthalate (PET), and a cyclic polyolefin (COC) were investigated with the copolymer of 2-hydroxy-6-naphthoic acid (HNA) and 4-hydroxybenzoic acid (HBA) (Vectra A type LCP). The LCP content changed in the range of 0-50 w/w%. The mechanical properties were determined by tensile tests on injection molded test bars in parallel and perpendicular directions to the flow. Except for the PC/LCP blends, the viscosity decreased with increasing LCP content, the tensile strength increased significantly in the parallel and decreased in the perpendicular direction indicating formation of fibrillar phase morphology. In the case of PC/LCP blends, a reinforcing effect was observed at low LCP contents, but above 20 w/w% the viscosity increased and the parallel tensile strength dropped to the value measured in the perpendicular direction. The loss of the reinforcing effect might originate from chemical reactions of the two polymers.

Original languageEnglish
Pages (from-to)737-755
Number of pages19
JournalComposite Interfaces
Volume13
Issue number8-9
Publication statusPublished - 2006

Fingerprint

polymer blends
Liquid crystal polymers
Polymer blends
polycarbonate
Thermoplastics
Viscosity
viscosity
liquids
polymers
polycarbonates
Polycarbonates
tensile strength
Tensile strength
mechanical properties
Mechanical properties
acids
Polyethylene Terephthalates
Acids
Nylons
polyethylene terephthalate

Keywords

  • Amorphous polyamide
  • Cyclic polyolefln
  • Liquid-crystalline polymer blends
  • Polycarbonate
  • Polyethylene-terephthalate
  • Viscosity ratio

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Effect of viscosity ratio of the components of thermoplastic and liquid-crystalline polymer blends on the properties. / Fekete, E.; Földes, E.; Lengyel, Zoltán.

In: Composite Interfaces, Vol. 13, No. 8-9, 2006, p. 737-755.

Research output: Contribution to journalArticle

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AB - The effects of viscosity ratio on the rheological and mechanical properties of the blends of four thermoplastics of low viscosity and a liquid crystalline polymer (LCP) were studied. A polyamide of reduced crystallinity (amorphous PA), a polycarbonate (PC), a polyethylene-terephthalate (PET), and a cyclic polyolefin (COC) were investigated with the copolymer of 2-hydroxy-6-naphthoic acid (HNA) and 4-hydroxybenzoic acid (HBA) (Vectra A type LCP). The LCP content changed in the range of 0-50 w/w%. The mechanical properties were determined by tensile tests on injection molded test bars in parallel and perpendicular directions to the flow. Except for the PC/LCP blends, the viscosity decreased with increasing LCP content, the tensile strength increased significantly in the parallel and decreased in the perpendicular direction indicating formation of fibrillar phase morphology. In the case of PC/LCP blends, a reinforcing effect was observed at low LCP contents, but above 20 w/w% the viscosity increased and the parallel tensile strength dropped to the value measured in the perpendicular direction. The loss of the reinforcing effect might originate from chemical reactions of the two polymers.

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