A study on the ternary blends of nylon 6, a thermotropic liquid crystalline polymer, and a thermoplastic elastomer

Seo, Yongsok; Kim, Kwang Ung

doi:10.1002/pen.10223

Cited by 29 publications

(36 citation statements)

References 18 publications

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“…1, it is readily apparent that the viscosity of the blends decreases with increasing LCP content up to 20 wt.% of LCP, with the further addition of LCP a slight increase in the viscosity of the blends is observed. This decrease in the viscosity at the lower level of LCP were attributed to be formation of the elongated fibrils of the LCP phase, which tend to lubricate the melt [11] . However, at higher levels of LCP the fibrillation capability of LCP diminished, as is revealed by the SEM study.…”

Section: Resultsmentioning

confidence: 98%

Binary Blends of Polytetrafluoroethylene and Liquid Crystalline Polymer

Das

Banthia

Adhikari

et al. 2006

Polymer-Plastics Technology and Engineering

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Blends of polytetrafluoroethylene (PTFE) and liquid crystalline polymer (LCP) were prepared by varying the amount of LCP when using a melt mixing technique. The rheological, morphological, thermal, and dynamic mechanical properties of the blends were investigated. The viscosity of the blends was decreased with the increasing LCP content in the blends up to 20% of LCP. With further loadings of LCP a slight improvement in viscosity was observed. This decrease in the viscosity was attributed to be the interlayer slip of the polymers due to formation of the elongated fibrils of LCP, whereas at higher amounts of LCP the fibril nature of LCP was not apparent, which is revealed by the scanning electron microscopic study. The differential scanning calorimetry (DSC) results showed a shift in the melting temperature (T m ) of PTFE with the addition of LCP. This shift in the T m of PTFE is due to increasing crystallinity. This is further supported by the X-ray diffraction (XRD) and dynamic mechanical analysis (DMA) studies.

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Section: Resultsmentioning

confidence: 98%

Binary Blends of Polytetrafluoroethylene and Liquid Crystalline Polymer

Das

Banthia

Adhikari

et al. 2006

Polymer-Plastics Technology and Engineering

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“…In the simple shear flow of Newtonian fluids, a dispersed droplets will be elongated if Ca > 0.5, indicating that the ratio of shear stress ( m η γ ) should be larger than a half of the interfacial energy ( / b σ ) (16) .…”

Section: Morphologymentioning

confidence: 99%

“…Machiels et al (12) studied the fiber formation, stability, and properties of TPE (Arnitel EM630)/Vectra A900 blends and reported that the mechanical properties increased with increasing draw ratio of the extrudate as a result of an increase in the fiber aspect ratio and molecular orientation in the TLCP phase. Seo and co-workers (16)- (17) investigated ethylene-propylene-diene monomer rubber (EPDM)/Vectra B950 blends and suggested the effect of elongational deformation on the fibrillation of TLCP. Chakraborty et al (18) studied the self-reinforcing characteristics of Vectra A950 in EPDM.…”

Section: Introductionmentioning

confidence: 99%

“…We also suggested that the fibrillar morphology can be obtained in as-extruded strands if the matrix viscosity is high enough or else the interfacial tension of the blend must be low enough (20) . To the authors knowledge, although a number of studies were done with simple matrix systems such as TLCP/PP (33)- (37) , TLCP/EPDM (16)- (18) and TLCP/SEBS (10)- (11), (13)- (15), (20)- (22) , the phase behavior and properties of a more complex TPE system like Santoprene (vulcanized PP-EPDM elastomer) in situ reinforced with TLCP have not been investigated. In this study, the in situ composites based on Santoprene polyolefinic TPE and Rodrun LC3000 were investigated.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Reinforcing Elastomer Composite Based on Polyolefinic Thermoplastic Elastomer and Thermotropic Liquid Crystalline Polymer

Saikrasun

Phoban

Limpisawasdi

et al. 2007

JMMP

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In situ reinforcing elastomer composites based on Santoprene thermoplastic elastomer, a polymerized polyolefin compound of ethylene-propylene-diene monomer (EPDM)/polypropylene (PP), and a thermotropic liquid crystalline polymer (TLCP), Rodrun LC3000, were prepared using a single-screw extruder. The rheological behavior, morphology, mechanical and thermal properties of the blends containing various LC3000 contents were investigated.All neat components and their blends exhibited shear thinning behavior. With increasing TLCP content, processability became easier because of the decrease in melt viscosity of the blends. Despite the viscosity ratio of dispersed phase to the matrix phase for the blend system is lower than 0.14, most of TLCP domains in the blends containing 5-10 wt% LC3000 appeared as droplets. At 20 wt% LC3000 or more, the domain size of TLCP became larger due to the coalescence of liquid TLCP threads that occurred during extrusion. The addition of LC3000 into the elastomer matrix enhanced the initial tensile modulus considerably whereas the extensibility of the blends remarkably decreased with addition of high TLCP level (>20wt%). The results obtained from thermogravimetric analysis suggested that the incorporation of LC3000 into Santoprene slightly improved the thermal resistance both in nitrogen and in air.

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“…Recently, we systematically sought for the preparation method of polyamide in situ composites [14,[23][24][25]. What we found is that an in situ composite of a polyamide can be made even with the extrudates from a twin screw extruder where the shear rate is not high and with very weak or no drawing, provided a compatibilizer is added to the binary blend [23,25].…”

Section: Introductionmentioning

confidence: 99%

The morphology and properties of ternary blends of polyamides, a thermotropic liquid crystalline polymer and a compatibilizer

Seo¹,

Kim²,

Hwang³

et al. 2000

Composite Interfaces

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Relationships between the properties of ternary blends of polyamides, a thermotropic liquid crystalline polymer (TLCP) (poly(ester amide)) and a maleic anhydride grafted polyolefin are studied under various processing conditions. Thermal properties show the compatibility in the ternary blend. The shear viscosity of a ternary blend is slightly lower than that of a binary blend. The morphology of the dispersed TLCP phase varies between droplets and oriented fibrils when the drawing is weak, and is highly correlated with changes in tensile properties. Though there are some morphological differences depending on the matrix thermoplastics (nylon 6, nylon 66 or nylon 46), it is commonly observed that addition of the compatibilizer induces better adhesion at the interface as well as lower interfacial tension, and hence enables the deformation of the dispersed phase into elongated and fibril shapes, even when the viscosity of the TLCP is much lower than that of the matrices. Fibril development is favored in the strong elongational flow which was possible because the compatibilizer stabilizes the extrudate. In all cases, it is manifest that, whenever applicable, extension is a decisive factor for TLCP fibril formation that is necessary for a significant improvement in tensile modulus and strength. There exists, however, an optimum compatibilizer amount and optimum die exit temperature, both of which provide more uniform morphology and more fibril shapes which contribute to enhanced tensile properties.

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A study on the ternary blends of nylon 6, a thermotropic liquid crystalline polymer, and a thermoplastic elastomer

Cited by 29 publications

References 18 publications

Binary Blends of Polytetrafluoroethylene and Liquid Crystalline Polymer

Binary Blends of Polytetrafluoroethylene and Liquid Crystalline Polymer

In Situ Reinforcing Elastomer Composite Based on Polyolefinic Thermoplastic Elastomer and Thermotropic Liquid Crystalline Polymer

The morphology and properties of ternary blends of polyamides, a thermotropic liquid crystalline polymer and a compatibilizer

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