Membranes par melange de polymeres—I. Morphologie

David, M.-O.; Nguyen, Trong Q.

doi:10.1016/0014-3057(94)90192-9

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…It is noteworthy that EVOH/PVOH7 and EVOH/PVOH15 showed quite the same size distribution profile despite a slightly higher average mean domain size value for EVOH/PVOH15. The large domain size distribution observed for EVOH/PVOH30 was consistent with the trend commonly reported in the literature for blend composition approaching the phase inversion …”

Section: Resultssupporting

confidence: 91%

“…The large domain size distribution observed for EVOH/PVOH30 was consistent with the trend commonly reported in the literature for blend composition approaching the phase inversion. [16][17][18][19][20][21][22] Microstructure Table 1 summarizes the values of the characteristic transitions observed for the neat EVOH and neat PVOH films during cooling from 250 C at 20 C min −1 and subsequent heating scan at 20 C min −1 .…”

Section: Resultsmentioning

confidence: 99%

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Morphology, mechanical, and water transport properties of melt blended EVOH/PVOH films

Blanchard

Gouanvé

Espuche

2019

J Polym Sci B Polym Phys

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Herein, we report for the first time the successful preparation of ethylene–vinyl alcohol (EVOH)/poly(vinyl alcohol) (PVOH) blends by a melt blending process for PVOH volume content ranging from 0 to 30%. Thermal stability up to 270 °C was maintained for all blends. The blends morphology consisted in spherical low size PVOH domains homogeneously dispersed in the EVOH matrix with good interfacial properties. An increase of the mean size of the PVOH domains (from 0.3 to 1.2 μm) and of the size distribution was evidenced as the PVOH content increased. The contribution of each phase to the water sorption and diffusion was clearly demonstrated. The impact of water uptake was investigated on the chains mobility by using Gordon–Taylor law and on the mechanical properties of the blends with respect to the reference polymers. It was pointed out that the reinforcing effect of PVOH phase decreased as the water activity increased. However, a significant elongation at break was maintained, underlining the major role played by the EVOH continuous phase at high water activity. Finally, it was shown that adding PVOH to EVOH up to 15 vol % allowed strengthening the material at low water activity and keeping interesting elongation at break and barrier properties at high water activity. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 838–850

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Morphology, mechanical, and water transport properties of melt blended EVOH/PVOH films

Blanchard

Gouanvé

Espuche

2019

J Polym Sci B Polym Phys

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“…More hydroxyl groups are then available as hydrogen bond‐donors to develop more interchain interactions with the sulfonate acceptor group in PSSNa; and thus, the presence of a moderate amount of acetate groups in PVA appears to be important to obtain PVA/PSSNa compatibility. This result confirms the early hypothesis which assumed that the compatibility of PVA and PSSNa is due to the formation of hydrogen bonds between the hydroxyl groups of PVA and the sulfonate groups of PSSNa 27…”

Section: Resultssupporting

confidence: 91%

Investigation of the interpolymer association between poly(vinyl alcohol) and poly(sodium styrene sulfonate) in aqueous solution

Mbareck

Nguyen

2009

J of Applied Polymer Sci

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A viscosimetric method has been used to study the interpolymer association between poly(vinyl alcohol) (PVA) and poly(sodium styrene sulfonate) (PSSNa) in aqueous solution. At constant molecular weight of PSSNa, it was found that, the PVA and PSSNa associations were improved with the decrease of molecular weight of PVA and the decrease of its hydrolysis degree. The measurement of intrinsic viscosity [g] and the determination of Huggins associative coefficient K H of different PVA samples were used to select the most appropriate PVA sample, which leads to homogeneous polymer-polymer mixtures (PVA with hydrolysis degree 87-89%, molecular weight 124,000-186,000 g/mol, intrinsic viscosity [g] ¼ 1.02 dL/g, and Huggins associative coefficient K h.ass ¼ 0.76). The obtained results show that the interpolymer association between PVA and PSSNa, in aqueous solution, is mainly due to intermolecular hydrogen bonds between hydroxyl groups of PVA and sulfonate groups of PSSNa.

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“…The PVA-PSSNa compatibility would be driven by the decrease in the hydrolysis degree of PVA. 38 The higher the number of distributed acetate groups that remain randomly on the chains after incomplete hydrolysis, the weaker the interactions among OH groups, and the lower the crystallinity.…”

mentioning

confidence: 99%

Poly(vinyl alcohol) and poly(sodium styrene sulfonate) compatibility by differential scanning calorimetry, Fourier transform infrared and scanning electron microscopy

Mbareck

Nguyen

Saiter

2009

J of Applied Polymer Sci

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To prepare ion-exchange membrane from poly(vinyl alcohol) (PVA) and poly (sodium-4-styrene sulfonate) (PSSNa), the polymer compatibility was investigated by means of differential scanning calorimetry, attenuated total reflection Fourier Transform Infrared spectroscopy, and scanning electron microscopy. Using the strong-fragile concept to interpret the differential scanning calorimetric results, we show that the interactions between the segments of both polymers increase with decrease in PVA fraction. Because of these intermolecular interactions, the PVA crystallinity degree decreased with the decrease in PVA fraction, and a single-transition temperature was observed for the polymer blend in the amorphous phase. At the nanoscopic scale, the Fourier Transform Infrared results show that the PVA/PSSNa compatibility is mainly promoted by hydrogen bonds and dipole-ion interactions between PVA and PSSNa segments, whereas at microscopic scale, the morphology obtained by scanning electron microscopy technique shows that PVA and PSSNa form one homogeneous phase.

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Membranes par melange de polymeres—I. Morphologie

Cited by 10 publications

References 9 publications

Morphology, mechanical, and water transport properties of melt blended EVOH/PVOH films

Morphology, mechanical, and water transport properties of melt blended EVOH/PVOH films

Investigation of the interpolymer association between poly(vinyl alcohol) and poly(sodium styrene sulfonate) in aqueous solution

Poly(vinyl alcohol) and poly(sodium styrene sulfonate) compatibility by differential scanning calorimetry, Fourier transform infrared and scanning electron microscopy

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