Synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygen - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Carbohydrate Polymer Technologies and Applications Année : 2022

Synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygen

Résumé

Hydrophobic nanofibrilated cellulose (NFC) films were prepared by the casting of a mixture of NFC suspension in an aqueous emulsion of two blocked isocyanates - one prepared by the reaction of 4,4′- methylenebis (phenyl isocyanate) and phenol (MDI-2Ph) and a commercial one from trimethylol propane and toluene diisocyanate (Desmodur AP Stabil®) (TMP-TDI-3Ph),). The drying procedure was performed in two steps, i.e., first at 60 °C for 24 h and then at 170 °C for 10 min. Infrared spectroscopy (FT-IR), elemental analysis, and 13 Csingle bondNMR confirmed the chemical modification of cellulose. The NFC modified films showed an approximately 40 g m−2.day−1 water vapor transmission rate, which is almost 75% lower than that of non-modified NFC films (153 g m−2.day−1). The film modified with TMP-TDI-3Ph showed a very low oxygen transmission rate and lower than that with MDI-2Ph When exposed to a wet environment, the modified films maintained their stiffness with Young's modulus around 5 GPa, whereas that of non- modified films decreased from approximately 6.5 GPa to below 0.1 GPa.
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Dates et versions

hal-04095328 , version 1 (11-05-2023)

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Gustavo de Souza, Mohamed Naceur Belgacem, Alessandro Gandini, Antonio José Felix Carvalho. Synthesis and characterization of nanofibrilated cellulose films modified with blocked isocyanates in aqueous media and their barrier properties to water vapor and oxygen. Carbohydrate Polymer Technologies and Applications, 2022, 4, pp.100249. ⟨10.1016/j.carpta.2022.100249⟩. ⟨hal-04095328⟩

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