The morphology and tensile strength in filled and unfilled thermotropic liquid-crystalline polymer injection mouldings

Zülle, B.; Demarmels, A.; Plummer, C. J. G.; Schneider, Tyler; Kausch, H. H.

doi:10.1007/bf00729644

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…As a result, as can be seen in Figure 5, the anisotropy of the LCP was maintained in the composites. This agrees with the small influence of the fillers on the orientation of an LCP seen in another LCP–filler study 8, 10. Finally, the fact that the modulus of elasticity of the composites was similar to or slightly higher than that of the neat LCP was highly significant because of the negligible price of the filler compared with that of the LCP.…”

Section: Resultssupporting

confidence: 87%

“…However, as can be seen in Figure 5, the modulus of elasticity in the parallel direction slightly increased in the case of mica with increasing filler contents. This was probably not due to a different orientation of the LCP in the filled and unfilled materials because it is usually similar in other LCP–filler composites 8, 10. Therefore, the observed behavior was probably due to the large L / D ratio of the mica particles in comparison with that of CaCO 3 and to their mostly parallel orientation in the skin, which was discussed in the Morphology section.…”

Section: Resultsmentioning

confidence: 79%

“…For the parallel direction, it must be a result of the ductility decrease with both mica and CaCO 3 , which made the stress–strain curves shorter, thereby leading to a smaller maximum stress. Slight tensile strength decreases were also observed for Vectra–wollastonite composites 8. For the transverse direction, the ductility decrease had less influence on the height of the tensile curve than could be expected from the ductility decrease because the specimens broke close to the yield point.…”

Section: Resultsmentioning

confidence: 82%

“…The addition of fillers has been used6–14 to overcome these disadvantages. The low viscosity of LCPs, particularly the semirigid ones,15 makes them attractive candidates as matrices for filled polymers.…”

Section: Introductionmentioning

confidence: 99%

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Influence of fillers on the mechanical response of an amorphous liquid‐crystalline polymer

Guerrica-Echevarría

Eguiazábal

Nazábal

2003

J of Applied Polymer Sci

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A semirigid and amorphous commercial liquid-crystalline copolyester (Rodrun) was filled with mica and calcium carbonate (up to 25 wt %) by direct injection molding. The fillers led to decreases in the processability, as observed by torque increases, but maintained the thermal resistance of Rodrun. The effects of the two fillers on the modulus of elasticity, ductility, and tensile strength were the same or very similar. The decrease in the tensile strength (20% for a 10% filler content) was compensated by a generally slight increase in the modulus of elasticity, whatever the filler content was. This balance of properties found in these new liquid-crystalline-polymer-based materials and the important savings that the fillers bring may spread the applications of these materials' matrices.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Influence of fillers on the mechanical response of an amorphous liquid‐crystalline polymer

Guerrica-Echevarría

Eguiazábal

Nazábal

2003

J of Applied Polymer Sci

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Effect of fumed silica nanoparticles on glass fiber filled thermotropic liquid crystalline polymer composites

Kim

Hwang²

2008

Polymer Composites

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Glass fiber filled thermotropic liquid crystalline polymer (gLCP)/silica composites were prepared by melt compounding. The total torque of the gLCP/silica composites decreased and the melt flow index increased with increasing silica content, which indicates that the fumed silica nanoparticles act as good processing aids and enhance the processing behavior of gLCP/silica composites. The rheological properties of the gLCP/silica composites were significantly dependent on the silica content. The complex viscosity and storage modulus (G′) of the gLCP/silica composites decreased with increasing silica content. This was attributed to the ability of the silica nanoparticles to break the glass fiber–glass fiber interactions in the gLCPs. The storage modulus and loss modulus (G″) of the gLCP/silica composites increased with increasing frequency, and the increment was more significant at low frequency. Incorporation of a small quantity of silica nanoparticles improved the thermal stability and mechanical properties of gLCP/silica composites. However, at high silica nanoparticle content the mechanical properties of gLCP/silica composites decreased because of the aggregation of silica nanoparticles. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers

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Effects of filler type and mixing method on the physical properties of a reinforced semirigid liquid crystal polymer

Scaffaro

Pedretti

Mantia

1996

European Polymer Journal

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The morphology and tensile strength in filled and unfilled thermotropic liquid-crystalline polymer injection mouldings

Cited by 7 publications

References 2 publications

Influence of fillers on the mechanical response of an amorphous liquid‐crystalline polymer

Influence of fillers on the mechanical response of an amorphous liquid‐crystalline polymer

Effect of fumed silica nanoparticles on glass fiber filled thermotropic liquid crystalline polymer composites

Effects of filler type and mixing method on the physical properties of a reinforced semirigid liquid crystal polymer

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