Influence of the type of polyhydroxyether on mechanical properties of PET/TLCP/polyhydroxyether blends

Bruggeman, Albert; Tinnemans, A. H. A.

doi:10.1002/(sici)1097-4628(19990214)71:7<1125::aid-app10>3.0.co;2-r

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…The liquid crystalline character does not seem to have a very important effect in this blend system. The use of other types of polyhydroxyether, and the question whether the interfacial adhesion has been improved, will be discussed in a following article 36…”

Section: Resultsmentioning

confidence: 99%

Reactive blending of poly(ethylene terephthalate) with a liquid crystalline copolyester and polyhydroxyether

Bruggeman

Tinnemans

1999

J. Appl. Polym. Sci.

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Poly(ethylene terephthalate) modified with a dianhydride (PET-anhydride) was melt-blended with a liquid crystalline copolyester (Vectra A) in the presence of a small amount of a liquid crystalline polyhydroxyether. The mechanical properties of a blend consisting of PET-anhydride/Vectra A/polyhydroxyether were drastically improved compared to blends without polyhydroxyether or without anhydride. Meltspun fibers of PET-anhydride/Vectra A/polyhydroxyether in a 80/20/0.75 weight ratio displayed a much higher tensile modulus (17 GPa) and tensile strength (214 MPa) than did a 80/20 PET-anhydride/Vectra A blend (4 GPa and 60 MPa, respectively). A similar increase in modulus and strength was found for a 90/10/0.75 relative to a 90/10 blend. The tensile moduli of the blends can well be described by the Tsai-Halpin equation. A better fibril formation was observed, which was attributed to an improved viscosity ratio. Reactions between the various functional groups during melt processing were indicated by viscosity measurements. The polyhydroxyether may act as a reactive compatibilizer which improves the interfacial adhesion, chemically and/or physically. WAXD recordings of both blends showed a crystalline and highly oriented Vectra phase. The PET phase was unoriented and amorphous in a PET/Vectra blend and semicrystalline and weakly oriented in a PET/Vectra/polyhydroxyether blend. Postdrawing of the various blend fibers to ϭ 4 increased the modulus by about 40% and the tensile strength by more than 100%, mainly through orientation of the PET phase.

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Section: Resultsmentioning

confidence: 99%

Reactive blending of poly(ethylene terephthalate) with a liquid crystalline copolyester and polyhydroxyether

Bruggeman

Tinnemans

1999

J. Appl. Polym. Sci.

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“…Considering the variation of T c with f, the activation energy (absolute value of DE) was estimated from the slopes [represented by Equation (8)(9)(10)] of the least square lines. Figure 13 illustrates the least square plots representing the Augis-Bennett, Kissinger and Takhor methods.…”

Section: Determination Of the Activation Energy For Non-isothermal Crmentioning

confidence: 99%

“…[6][7][8][9][10][11] They used different types of LCP such as Vectra A950, poly[(ethylene oxide)-graft-(sebacic acid/4,4'-dihydroxybiphenyl)] (PE-g-SBH), poly(ethylene 2,6-napthalate) (PEN), para-hydroxybenzoic acid/PET (PHB60-PET40), hydroxybenzoic acid/PET (HBA73-PET40), p-amino benzoic acid/PET (ABA30/PET), Rodrun LC5000 and also selfsynthesised phosphorus-containing LCP to prepare blends. Recently, researchers also used compatibilisers such as Lotader AX8900, [9] polycarbonate [PC], [7] poly(dihydroxyether), [10] etc., to compatibilise PET/Vectra A950 blends. [10] They mainly investigated how the morphology of the blend affects the thermal and mechanical properties.…”

mentioning

confidence: 99%

“…Recently, researchers also used compatibilisers such as Lotader AX8900, [9] polycarbonate [PC], [7] poly(dihydroxyether), [10] etc., to compatibilise PET/Vectra A950 blends. [10] They mainly investigated how the morphology of the blend affects the thermal and mechanical properties. In most of the cases if there is a good miscibility between PET and LCP, the mechanical properties of the blend such as modulus and strength increases.…”

mentioning

confidence: 99%

“…In most of the cases if there is a good miscibility between PET and LCP, the mechanical properties of the blend such as modulus and strength increases. [7,8,10,11] Recently, Chang et al [12] prepared blend of thermotropic LCP and PBT/organoclay composite and reported about the texture and enhanced tensile properties for the blend compared to the composite. Tang et al studied the effect of incorporation of thermotropic LCP on the rheological behaviour of PE/organoclay composites by capillary rheometry experiments.…”

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confidence: 99%

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Effect of Nanoclay Incorporation on the Thermal Properties of Poly(ethylene terephthalate)/Liquid Crystal Polymer Blends

Bandyopadhyay¹,

Ray²,

Bousmina³

2010

Macro Materials & Eng

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The effect of OMLS incorporation on the thermal properties of PET/LCP blends is studied. Pure and OMLS‐modified PET/LCP blends were prepared by melt‐extrusion using twin‐screw extruder. The morphological analyses of PET/LCP blends show that OMLS addition enhances the phase‐separated structure of the pure blend. A detailed study on the thermal properties of the pure and OMLS‐modified PET/LCP blends were carried out by means of DSC in both conventional and modulation modes. Results show a complex melting behaviour comprises of successive melting and re‐crystallisation. Finally, non‐isothermal crystal‐growth kinetics of pure and OMLS‐modified blends were investigated.magnified image

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Recycled poly(ethylene terephthalate)/linear low‐density polyethylene blends through physical processing

Zhang

et al. 2009

J of Applied Polymer Sci

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Poly(styrene-ethylene/butylene-styrene) (SEBS) was used as a compatibilizer to improve the thermal and mechanical properties of recycled poly(ethylene terephthalate)/linear low-density polyethylene (R-PET/LLDPE) blends. The blends compatibilized with 0-20 wt % SEBS were prepared by low-temperature solid-state extrusion. The effect of SEBS content was investigated using scanning electron microscope, differential scanning calorimeter, dynamic mechanical analysis (DMA), and mechanical property testing. Morphology observation showed that the addition of 10 wt % SEBS led to the deformation of dispersed phase from spherical to fibrous structure, and microfibrils were formed at the interface between two phases in the compatibilized blends. Both differential scanning calorimeter and DMA results revealed that the blend with 20 wt % SEBS showed better compatibility between PET and LLDPE than other blends studied. The addition of 20 wt % of SEBS obviously improved the crystallizibility of PET as well as the modulus of the blends. DMA analysis also showed that the interaction between SEBS and two other components enhanced at high temperature above 130 C. The impact strength of the blend with 20 wt % SEBS increased of 93.2% with respect to the blend without SEBS, accompanied by only a 28.7% tensile strength decrease.

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Influence of the type of polyhydroxyether on mechanical properties of PET/TLCP/polyhydroxyether blends

Cited by 8 publications

References 7 publications

Reactive blending of poly(ethylene terephthalate) with a liquid crystalline copolyester and polyhydroxyether

Reactive blending of poly(ethylene terephthalate) with a liquid crystalline copolyester and polyhydroxyether

Effect of Nanoclay Incorporation on the Thermal Properties of Poly(ethylene terephthalate)/Liquid Crystal Polymer Blends

Recycled poly(ethylene terephthalate)/linear low‐density polyethylene blends through physical processing

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