Effect of humidity on mechanical, thermal and barrier properties of EVOH films

Blanchard, A. F.; Gouanvé, Fabrice; Espuche, Éliane

doi:10.1016/j.memsci.2017.06.031

Cited by 45 publications

(33 citation statements)

References 35 publications

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“…Figure presents the evolution of the water uptake ( G ) at 23 °C for the neat PVOH, neat EVOH, and their blends. In agreement with literature data, the shape of the isotherms of neat EVOH and neat PVOH is representative of water sorption on specific polymer sites (the hydroxyl groups of EVOH and PVOH) at low water activity followed by water clustering at high water activity …”

Section: Resultssupporting

confidence: 90%

“…More precisely, values only slightly varied between a w = 0.2 and a w = 0.6, then significantly increased between a w = 0.6 and a w = 0.9 as a sign of a plasticization mechanism. Our previous analysis of the clustering mechanism in EVOH underlined the formation of rather small water clusters at high activity (two water molecules/cluster at a w = 0.9) . For neat PVOH, water diffusion coefficients first increased by a factor 50 from a w = 0.2 to 0.7 to reach an optimum and then decreased.…”

Section: Resultsmentioning

confidence: 96%

“…In agreement with literature data, the shape of the isotherms of neat EVOH and neat PVOH is representative of water sorption on specific polymer sites (the hydroxyl groups of EVOH and PVOH) at low water activity followed by water clustering at high water activity. 15,[41][42][43] A higher water uptake was observed for the PVOH film comparatively to the EVOH one. As an example, the uptake value at a water activity of 0.9 was about 16.7 wt % for PVOH and 7.5 wt % for EVOH.…”

Section: Influence Of the Humidity On Evoh/pvoh Blend Propertiesmentioning

confidence: 92%

“…Our previous analysis of the clustering mechanism in EVOH underlined the formation of rather small water clusters at high activity (two water molecules/cluster at a w = 0.9). 43 For neat PVOH, water diffusion coefficients first increased by a factor 50 from a w = 0.2 to 0.7 to reach an optimum and then decreased. The decrease of diffusion rate at high water activity is frequently observed for highly hydrophilic materials, like cellulose, starch, or chitosan for example.…”

Section: Sorption Kineticsmentioning

confidence: 97%

“…The impact of hydration on the chain mobility of neat EVOH, neat PVOH, and EVOH/PVOH blends was studied thanks to MDSC. Gordon-Taylor equation 43 which has already been shown to accurately describe the decrease of glass transition temperature as a function of hydration for different polymers was used. [53][54][55][56]…”

Section: Influence Of Humidity On the Glass Transition Temperaturementioning

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: 90%

Section: Resultsmentioning

confidence: 96%

Section: Influence Of the Humidity On Evoh/pvoh Blend Propertiesmentioning

confidence: 92%

Section: Sorption Kineticsmentioning

confidence: 97%

Section: Influence Of Humidity On the Glass Transition Temperaturementioning

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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A novel hydroxyl‐rich polyvinyl alcohol hot‐melt adhesive with excellent ultra‐low temperature adhesion and reusability

Li,

Zhang,

Liu

et al. 2024

J of Applied Polymer Sci

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Ethylene‐vinyl acetate (EVA) hot‐melt adhesives featured good thermal stability, strong weather resistance and fast bonding speed, are of great concern to the industry and engineering fields. However, the weak bond strength and poor reusability severely hinder their application under harsh conditions. Herein, the hydrolyzed EVA (EVOH) copolymers with rich hydroxyl groups are fabricated by an EVA hydrolysis reaction, and their mechanical properties, environmental adaptability, and reusability were systematically evaluated. As a result, the shear strengths measured by bonding the stainless steel plates can reach up to 16.4 MPa at room temperature (25°C) and 13.1 MPa at ultra‐low temperature (−196°C), indicating the good bonding performance of EVOH. Besides, owing to the excellent dynamic reversibility and thermal stability, it can obtain 92% of shear strength retention rate after 10 reuses, which is the highest value reported so far. In addition, the hydroxyl‐rich EVOH delivers good solvent and corrosion resistance that can be widely used for bonding various materials. Therefore, this research provide new lightspots for developing environmentally friendly hot‐melt adhesives with excellent bonding properties, corrosion resistance, and reusability.

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Controlled localization of graphene oxide to improve barrier, biodegradation and mechanical properties of PBAT/EVOH

Elhamnia,

Hashemi Motlagh,

Jafari

2024

J of Applied Polymer Sci

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Incorporating graphene oxide (GO) with controlled localization into poly(butylene adipate‐co‐terephthalate) (PBAT) blends with poly(ethylene vinyl alcohol) (EVOH) aimed to improve barrier properties, biodegradability, and mechanical strength of PBAT. The PBAT/EVOH/GO nanocomposites containing 0 to 1 wt% of GO were prepared by a reactive mixing process in internal mixer. Microscopic images confirmed that the GO nanoplatelets are mainly localized in PBAT phase and then at the interface, contrary to the thermodynamic affinity of GO toward EVOH. The reactive nature of PBAT/EVOH/GO nanocomposites was confirmed via time‐sweep rheological studies where specific changes were observed in melt viscosity over time. The results of microscopic studies, rheometry, tensile test, and dynamic mechanical thermal analysis (DMTA) confirmed that localizing GO at the interface establishes strong interactions between PBAT and EVOH. By the addition of 0.75 wt% GO, tensile and yield strength were improved by 19% and 45%, respectively. Increasing GO significantly increased the hydrolysis degradation rate of the nanocomposites. Furthermore, the addition of GO considerably decreased the oxygen and water vapor permeability of the blends by up to 40% at 1 wt% GO.

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Effect of humidity on mechanical, thermal and barrier properties of EVOH films

Cited by 45 publications

References 35 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

A novel hydroxyl‐rich polyvinyl alcohol hot‐melt adhesive with excellent ultra‐low temperature adhesion and reusability

Controlled localization of graphene oxide to improve barrier, biodegradation and mechanical properties of PBAT/EVOH

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