Investigation on the influence of multi-step processing on the mechanical and thermal properties of cellulose reinforced EVOH composites

Graninger, Georg; Kumar, Sandeep; Falzon, Brian

doi:10.1063/1.5142959

Cited by 2 publications

(1 citation statement)

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“…Ethylene-vinyl alcohol (EVOH) copolymers are an important category of barrier materials that have been used in many applications such as packaging of food, cosmetics, and fuel tanks owing to their excellent barrier properties, nontoxicity, good chemical resistance, thermal stability, and processability. [1][2][3][4][5][6][7][8] Recently, the significant growth of green packing demand as well as their great potential for innovation fields including battery separator, 9,10 protein separation, 11,12 and drug release 13,14 have led to a resurgence of interest of these materials in both academia and industry. The current industrial production involves radical copolymerization of ethylene and vinyl acetate to give the precursor ethylene-vinyl acetate (EVA) copolymer, which is subjected to alcoholysis with methanol to afford EVOH.…”

Section: Introductionmentioning

confidence: 99%

Structure and catalytic performance relationship of ionic liquids as recyclable alcoholysis catalysts for green preparation of ethylene‐vinyl alcohol copolymer

Ding

Ren

et al. 2023

J of Applied Polymer Sci

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Alcoholysis is an important reaction for the current industrial production of ethylene‐vinyl alcohol (EVOH) copolymers. Herein, two series of ionic liquids (ILs), acidic and basic ones, were used as eco‐friendly catalysts for alcoholysis of ethylene‐vinyl acetate (EVA) copolymer. The effects of the reaction parameters (catalyst loading, n(CH3OH)/n(Ac) and reaction time), EVA composition, and nitrogen flow on the alcoholysis were systematically investigated. A nearly 100% of alcoholysis degree was achieved using acidic ILs ([BHSO3MIm][HSO4]) under the optimum conditions (3.0 mol% catalyst loading relative to the VA units in EVA, n(CH3OH)/n(Ac) = 30, 70°C, 6 h). Moreover, [BHSO3MIm][HSO4] could be reused at least five times without the decrease of catalytic activity, showing excellent recyclability. The interactions between IL and the substrate methanol and the model compound ethyl acetate were investigated by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance techniques, and on the basis of these results, the plausible mechanisms of acidic and basic ILs catalyzed alcoholysis of EVA were proposed.

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