Bulk polymer/solvent interactions for polyethylene and EVA copolymers, below their melting temperatures

Camacho, Javier; Díez, Eduardo; Ovejero, Gabriel

doi:10.1007/s00289-016-1694-3

Cited by 7 publications

(18 citation statements)

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“…To characterize the structure of the studied polymers, DSC analyses were performed. The DSC curves of PE, PVAc and EVA polymers can be also found in previous works …”

Section: Experimental Data and Methodologysupporting

confidence: 54%

“…The Flory–Huggins parameters ( χ ) were taken from previous publications . In these sources, they were calculated with Eqn , from the values of infinite dilution activity coefficients, Ω 1 ∞ (which were previously calculated from retention volume values) following the inverse gas chromatography (IGC) basis:

χ = normalln ((), Ω_{1}^{\infty}) - ((), 1 - \frac{1}{r}) + normalln \frac{ρ_{1}}{ρ_{2}}

…”

Section: Experimental Data and Methodologymentioning

confidence: 99%

“…In this equation, r is the ratio between molar volume of the polymer and the molar volume of the solvent, and ρ 1 and ρ 2 are the solvent and polymer densities, respectively. The Flory–Huggins values are summarized in Tables and .…”

Section: Experimental Data and Methodologymentioning

confidence: 99%

“…As PE and both EVA copolymers are semi‐crystalline, for calculation of their HSPs it is fundamental to emphasize the importance of using the Flory–Huggins parameters obtained considering only the amorphous part of the polymer, in order to take account only of the bulk thermodynamic interactions, instead of employing the overall Flory–Huggins parameter, which considers both bulk and adsorption interactions . These amorphous Flory–Huggins parameters can be determined from the overall Flory–Huggins parameter values and the corresponding degrees of crystallinity of the polymers . These latter crystallinity values ( X c ) were calculated with

X_{c} = ((), 1 - \frac{V_{g, sample}}{V_{g, amorphous}}) \times 100

where V g,sample is the retention volume of the solute along the curvature line in the crystalline region (above the melting point) and V g,amorphous is the retention volume of the solute along the extrapolated line of the amorphous region.…”

Section: Experimental Data and Methodologymentioning

confidence: 99%

“…These latter crystallinity values ( X c ) were calculated with

X_{c} = ((), 1 - \frac{V_{g, sample}}{V_{g, amorphous}}) \times 100

Section: Experimental Data and Methodologymentioning

confidence: 99%

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Hansen solubility parameter: from polyethylene and poly(vinyl acetate) homopolymers to ethylene–vinyl acetate copolymers

Camacho

Díez

Díaz

et al. 2017

Polymer International

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The Hansen solubility parameters (HSPs) of two ethylene–vinyl acetate (EVA) copolymers (with 18 and 33 wt% of vinyl acetate) and their corresponding homopolymers (polyethylene, PE, and poly(vinyl acetate), PVAc) have been studied at various temperatures, employing the previously obtained Flory–Huggins parameters. From these latter values, a procedure based on the Hansen solubility spheres theory was employed to determine the HSPs, as well as the radius of interaction. The procedure was validated with literature data, with deviations of around 3%. The HSP values (dispersion, polar and association terms, respectively, all in MPa1/2) at 333.15 K are 14.84, −3.88 and 1.78 for PE, 17.65, −1.24 and 2.76 for EVA410 (with 18 wt% of vinyl acetate), 17.52, 0.15 and 3.61 for EVA460 (with 33 wt% of vinyl acetate) and 19.45, 10.59 and 5.76 for PVAc. The main characteristic of the obtained HSP values is that the high polar term of PVAc tends to increase the solubility character of the pure PE, and thus the EVA copolymers, allowing them to solubilize dispersion and polar compounds. Finally, it was also demonstrated that it is possible to predict the HSPs of EVA copolymers using the vinyl acetate content and the HSPs of pure PE and PVAc as input data. © 2017 Society of Chemical Industry

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“…To characterize the structure of the studied polymers, DSC analyses were performed. The DSC curves of PE, PVAc and EVA polymers can be also found in previous works …”

Section: Experimental Data and Methodologysupporting

confidence: 54%