Effect of overlapping cellulose nanofibrils and nanoclay layers on mechanical and barrier properties of spray-coated papers
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Effect of overlapping cellulose nanofibrils and nanoclay layers on mechanical and barrier properties of spray-coated papers. / De Oliveira, Maria Luiza Cafalchio; Mirmehdi, Seyedmohammad; Scatolino, Mário Vanoli; Júnior, Mario Guimarães; Sanadi, Anand Ramesh; Damasio, Renato Augusto Pereira; Tonoli, Gustavo Henrique Denzin.
In: Cellulose, Vol. 29, 2022, p. 1097–1113.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Effect of overlapping cellulose nanofibrils and nanoclay layers on mechanical and barrier properties of spray-coated papers
AU - De Oliveira, Maria Luiza Cafalchio
AU - Mirmehdi, Seyedmohammad
AU - Scatolino, Mário Vanoli
AU - Júnior, Mario Guimarães
AU - Sanadi, Anand Ramesh
AU - Damasio, Renato Augusto Pereira
AU - Tonoli, Gustavo Henrique Denzin
PY - 2022
Y1 - 2022
N2 - This work evaluates the effect of spray-coating papers using cellulose nanofibrils (CNFs) and nanoclay (NC) on the mechanical and barrier properties for application such as reinforced packaging bags. Sack kraft papers of 60 g m−2 (C60) were coated with combinations of CNFs and CNFs + NC, varying the number of layers on the internal face (IF) and external face (EF) of the paper. Their properties were compared to uncoated sack kraft papers with basis weight of 60 g m−2 (C60), 80 g m−2 (C80) and 120 g m−2 (C120). The amount of CNF/NC deposited was ~ 20 g m−2 while the CNF layer deposited was ~ 10 g m−2 on the sack papers. Increase in the number of layers deposited decreased the water vapor transmission rate (WVTR) compared to C60. CNF layer had lower contact angles on the coated papers than CNF/NC layer. The coated papers also showed a 44–66% increase in tensile index when compared to C120. Papers coated with 2 layers of CNFs and 1 layer of CNFs /NC achieved the same tensile index as C120 and the layers also resulted in higher values of Young’s modulus (38–56%) when compared to C60. Spray-coating, with the appropriate layers, improved the mechanical and barrier properties of the coated papers, and is a possible alternative to producing papers with lower basis weight and using renewable raw materials. Additionally, the mixture of two hydrophilic components, such as nanofibrils and NC can result in a coating with more hydrophobic characteristics.
AB - This work evaluates the effect of spray-coating papers using cellulose nanofibrils (CNFs) and nanoclay (NC) on the mechanical and barrier properties for application such as reinforced packaging bags. Sack kraft papers of 60 g m−2 (C60) were coated with combinations of CNFs and CNFs + NC, varying the number of layers on the internal face (IF) and external face (EF) of the paper. Their properties were compared to uncoated sack kraft papers with basis weight of 60 g m−2 (C60), 80 g m−2 (C80) and 120 g m−2 (C120). The amount of CNF/NC deposited was ~ 20 g m−2 while the CNF layer deposited was ~ 10 g m−2 on the sack papers. Increase in the number of layers deposited decreased the water vapor transmission rate (WVTR) compared to C60. CNF layer had lower contact angles on the coated papers than CNF/NC layer. The coated papers also showed a 44–66% increase in tensile index when compared to C120. Papers coated with 2 layers of CNFs and 1 layer of CNFs /NC achieved the same tensile index as C120 and the layers also resulted in higher values of Young’s modulus (38–56%) when compared to C60. Spray-coating, with the appropriate layers, improved the mechanical and barrier properties of the coated papers, and is a possible alternative to producing papers with lower basis weight and using renewable raw materials. Additionally, the mixture of two hydrophilic components, such as nanofibrils and NC can result in a coating with more hydrophobic characteristics.
U2 - 10.1007/s10570-021-04350-3
DO - 10.1007/s10570-021-04350-3
M3 - Journal article
VL - 29
SP - 1097
EP - 1113
JO - Cellulose
JF - Cellulose
SN - 0969-0239
ER -
ID: 289231627