Many researchers have shown that cellulose nanofiber (CNF) is biodegradable and has excellent mechanical strength and transparency. In addition, CNFs have shown the excellent barrier properties and high potential as a barrier coating agents. However, the common CNFs have anionic charge a...
Many researchers have shown that cellulose nanofiber (CNF) is biodegradable and has excellent mechanical strength and transparency. In addition, CNFs have shown the excellent barrier properties and high potential as a barrier coating agents. However, the common CNFs have anionic charge and the hydrophilic nature, so they has poor interaction with anionic pulp fibers and poor water resistance. Therefore, conditions for charge change and hydrophobization must be established in order for CNF to be usefully used as a barrier coating agent. In this study, the effect of surface modification of the HwBKP on the Zeta potential of the CNF was evaluated. The HwBKP surface was modified using C-PAM and Poly-DADMAC prior to CNF manufacture using micro grinding. The zeta-potential of the CNFs changed from negative to positive after surface modified with Poly-DADMAC, but C-PAM could not modify the zeta-potential of the CNFs. However, comparing the unmodified CNF with the cationized CNF did not show any difference in average particle size. Surface modification of the HwBKP with polydiallyldimethylammonium chloride (Poly-DADMAC) was undertaken to manufacture cationic CNFs before micro-grinding. As the increased number of micro grinder passes and coating layers, the increase coat weight, air permeation resistance, and coverage of the barrier-coated paper improved. In addition, The coated weight and air permeability resistance of the paper barrier-coated with both cationic and anionic CNFs exhibited higher values than those of paper barrier-coated with only anionic CNFs for the same number of coating layers. Also, as the increased of CNF concentration, the coating layers could be adjusted, and relatively high potency could be obtained from the low coating frequency. The alkyl ketene dimer (AKD) was added to give the CNF hydrophobic. There were no significant differences in terms of the thickness, coated weight, and air permeability after the paper barrier-coated was performed using the cationic CNF and the anionic CNF containing the AKD, but the water resistance increased. Therefore, the cationic CNF and the anionic CNF containing the AKD positively affected the barrier coating.
Many researchers have shown that cellulose nanofiber (CNF) is biodegradable and has excellent mechanical strength and transparency. In addition, CNFs have shown the excellent barrier properties and high potential as a barrier coating agents. However, the common CNFs have anionic charge and the hydrophilic nature, so they has poor interaction with anionic pulp fibers and poor water resistance. Therefore, conditions for charge change and hydrophobization must be established in order for CNF to be usefully used as a barrier coating agent. In this study, the effect of surface modification of the HwBKP on the Zeta potential of the CNF was evaluated. The HwBKP surface was modified using C-PAM and Poly-DADMAC prior to CNF manufacture using micro grinding. The zeta-potential of the CNFs changed from negative to positive after surface modified with Poly-DADMAC, but C-PAM could not modify the zeta-potential of the CNFs. However, comparing the unmodified CNF with the cationized CNF did not show any difference in average particle size. Surface modification of the HwBKP with polydiallyldimethylammonium chloride (Poly-DADMAC) was undertaken to manufacture cationic CNFs before micro-grinding. As the increased number of micro grinder passes and coating layers, the increase coat weight, air permeation resistance, and coverage of the barrier-coated paper improved. In addition, The coated weight and air permeability resistance of the paper barrier-coated with both cationic and anionic CNFs exhibited higher values than those of paper barrier-coated with only anionic CNFs for the same number of coating layers. Also, as the increased of CNF concentration, the coating layers could be adjusted, and relatively high potency could be obtained from the low coating frequency. The alkyl ketene dimer (AKD) was added to give the CNF hydrophobic. There were no significant differences in terms of the thickness, coated weight, and air permeability after the paper barrier-coated was performed using the cationic CNF and the anionic CNF containing the AKD, but the water resistance increased. Therefore, the cationic CNF and the anionic CNF containing the AKD positively affected the barrier coating.
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