Dynamic mechanical properties and morphology of polyethylene/ethylene vinyl acetate copolymer blends

Khonakdar, Hossein Ali; Wagenknecht, Udo; Jafari, Seyed Hassan; Häßler, R.; Eslami, Hassan

doi:10.1002/adv.20019

Cited by 103 publications

(86 citation statements)

References 25 publications

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“…3(B)] the RET inclusions coalesce and further elongate in the injection molding direction into irregular domains within the HDPE matrix. The ellipsoidal length of RET inclusions at this composition were shown to extend past 14 m. The tendency towards coalescence of elastomeric particles added to brittle matrices and the elongation thereof has been shown in polyethylene/ethylene vinyl acetate (PE/EVA) blends at 30 wt % EVA 25 and in an HDPE/solid silicone system. 26 Likewise, a decrease in matrix domain size is seen with increasing compatibilizer content in poly(butylene terephthalate)/polypropylene system where the compatibilizer is similar to the glycidyl methacrylate component present in the RET system used here.…”

Section: Morphology Thermal and Mechanical Properties Of Blendsmentioning

confidence: 91%

Thermal, mechanical, and adhesive properties of HDPE/reactive ethylene terpolymer blends

Love

Xian

Karbhari

2007

J of Applied Polymer Sci

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Blends of high-density polyethylene (HDPE) and a reactive ethylene terpolymer (RET) were developed as a protective coating material for steel. A morphological study with scanning electron microscopy (SEM) indicated that blends of HDPE and RET are immiscible, while high interaction between these two phases was found. Crystallization and thermomechanical behavior of the blends were investigated using differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA). The crystallinity of HDPE decreased with the incorporation of RET slightly due to the disturbance of the highly viscous RET melt during crystallization. Tensile tests indicated that the addition of RET reduced both strength and modulus but increased the strain-to-break. Adhesion to steel substrates was improved with the incorporation of the RET component. An optimum composition of RET loading was detected to be in the range of 25-33 wt %, leading to the best adhesive performance, high tensile strength, and strain-to-failure of the blend material.

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Section: Morphology Thermal and Mechanical Properties Of Blendsmentioning

confidence: 91%

Thermal, mechanical, and adhesive properties of HDPE/reactive ethylene terpolymer blends

Love

Xian

Karbhari

2007

J of Applied Polymer Sci

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“…A few methods can be used to investigate the miscibility: DSC, DMA, SEM, and others. In our previous article, we showed that the DMA curves for LDPE/EVA and HDPE/EVA blends had only one glass transition temperature, 25 while the DSC curves and SEM results of these blends proved the incompatible nature of these blend systems.…”

Section: Mechanical Propertiesmentioning

confidence: 98%

Thermal and mechanical properties of uncrosslinked and chemically crosslinked polyethylene/ethylene vinyl acetate copolymer blends

Khonakdar

Jafari

Asl

et al. 2006

J of Applied Polymer Sci

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Uncrosslinked and chemically crosslinked binary blends of low-and high-density polyethylene (PE), with ethylene vinyl acetate copolymer (EVA), were prepared by a melt-mixing process using 0-3 wt % tert-butyl cumyl peroxide (BCUP). The uncrosslinked blends revealed two distinct unchanged melting peaks corresponding to the individual components of the blends, but with a reduced overall degree of crystallinity. The crosslinking further reduced crystallinity, but enhanced compatibility between EVA and polyethylene, with LDPE being more compatible than HDPE. Blended with 20 wt % EVA, the EVA melting peak was almost disappeared after the addition of BCUP, and only the corresponding PE melting point was observed at a lowered temperature. But blended with 40% EVA, two peaks still existed with a slight shift toward lower temperatures. Changes of mechanical properties with blending ratio, crosslinking, and temperature had been dominated by the extent of crystallinity, crosslinking degree, and morphology of the blend. A good correlation was observed between elongation-at-break and morphological properties. The blends with higher level of compatibility showed less deviation from the additive rule of mixtures. The deviation became more pronounced for HDPE/EVA blends in the phase inversion region, while an opposite trend was observed for LDPE/EVA blends with co-continuous morphology.

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“…The compatibility of the ternary blends was also studied by DMTA. Most polymer blends show one α-transition at high temperature (due to cooperative molecular movement) and one β-relaxation at low temperature (due to the movement of short chain segments) [12][13][14]. If the components in a polymer blend are miscible, one single structural relaxation should appear.…”

Section: Dynamic Mechanical Thermal Analysis (Dmta)mentioning

confidence: 99%

“…In previous studies the compatibility of blends of polyethylene and EVA have been determined from cloud point and glass transition temperature obtained using differential scanning calorimetry (DSC) [12][13][14]. Although useful, these methods are not always sufficiently precise in assessing the compatibility mainly because the difficulty in defining precisely the glass transitions in HMAs from DSC thermograms [15].…”

mentioning

confidence: 99%

Changes in compatibility, tack and viscoelastic properties of ethylene n-butyl acrylate (EBA) copolymer–pentaerythritol rosin ester blend by adding microcrystalline wax, Fischer–Tropsch wax and mixture of waxes

Moyano

París

Martı́n-Martı́nez

2016

International Journal of Adhesion and Adhesives

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Changes in compatibility, tack and viscoelastic properties of ethylene n-butyl acrylate (EBA) copolymer-pentaerythritol rosin ester blend by adding microcrystalline wax, Fischer-Tropsch wax and mixture of waxes, International Journal of Adhesion and Adhesives, http://dx.doi.org/10.1016/j.ijadhadh.2015.11.007 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractEthylene n-butyl acrylate copolymer (EBA) instead of ethylene vinyl acetate copolymer (EVA) can be used as the base polymer for hot melts. The lower polarity of EBA should affect differently the compatibility with the wax and the tackifier as compared to EVA. In this study the compatibility, tack and viscoelastic properties of EBA copolymer-pentaerythritol rosin ester blended with waxes of different nature (Fischer-Tropsch and microcrystalline) and in different amounts were studied.An increase in compatibility of EBA-copolymer blend with microcrystalline wax was produced leading to increased tack and open time, and reduced viscosity.In contrast, the addition of Fischer-Tropsch wax decreased the compatibility and tack of the EBA-copolymer blend. The addition of a mixture of microcrystalline and Fischer-Tropsch wax caused a better balance in the rheological properties and thermal stability of the EBA-copolymer blends. Finally, an increase in the wax mixture content produced a complete removal of tack caused by dilution of the tackifier in the polymer blend rather than by differences in compatibility.

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Dynamic mechanical properties and morphology of polyethylene/ethylene vinyl acetate copolymer blends

Cited by 103 publications

References 25 publications

Thermal, mechanical, and adhesive properties of HDPE/reactive ethylene terpolymer blends

Thermal, mechanical, and adhesive properties of HDPE/reactive ethylene terpolymer blends

Thermal and mechanical properties of uncrosslinked and chemically crosslinked polyethylene/ethylene vinyl acetate copolymer blends

Changes in compatibility, tack and viscoelastic properties of ethylene n-butyl acrylate (EBA) copolymer–pentaerythritol rosin ester blend by adding microcrystalline wax, Fischer–Tropsch wax and mixture of waxes

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