Abstract
As one of the most abundant natural polymers in nature, polysaccharides have the potential to replace petroleum-based polymers that are difficult to degrade in paper coatings. Polysaccharide molecules have a large number of hydroxyl groups that can bind strongly with paper fibers through hydrogen bonds. Chemical modification can also effectively improve the mechanical, barrier, and hydrophobic properties of polysaccharide-based coating layers and thus can further improve the related properties of coated paper. Polysaccharides can also give paper additional functional properties by dispersing and adhering functional fillers, e.g., conductive particles, catalytic particles or antimicrobial chemicals, onto paper surface. Based on these, this paper reviews the application of natural polysaccharides, such as cellulose, hemicellulose, starch, chitosan, and sodium alginate, and their derivatives in paper coatings. This paper analyzes the improvements and influences of chemical structures and properties of polysaccharides on the mechanical, barrier, and hydrophobic properties of coated paper. This paper also summarizes the researches where polysaccharides are used as the adhesives to adhere inorganic or functional fillers onto paper surface to endow paper with great surface properties or special functions such as conductivity, catalytic, antibiotic, and fluorescence.
Highlights
Polysaccharides, as one of the most abundant natural polymers, widely exist in animals, plants, and microorganisms
When the catalytic greater catalytic effect for catalytic paper, polysaccharide coatings are used to disperse and anchor fillers are embedded in polysaccharide-paper fiber network, coated paper usually has superior catalytic catalytic filler such as metal ions to paper activity and reusability [105]
The coating properties of polysaccharides are still inferior to that of petroleum-based synthetic polymers, which hinders the industrial application of polysaccharides in paper coating; excessive chemical modification of polysaccharides may cause additional pollution or weaken the bio-degradability of polysaccharides
Summary
Polysaccharides, as one of the most abundant natural polymers, widely exist in animals, plants, and microorganisms. The properties, and are conductive, well applied in paper coatings These petroleum-based polymers are polymers or adhesives used in barrier, pigment, and functional coatings are mainly petroleum-based difficult to be naturally degraded [12] causing serious environmental pollution. Ability because abundant groups, and be dispersed orpolymers dissolved in paper coating is a pressing task [12] They have good film-forming properties [13]. Some polysaccharides have amphiphilic thestructures hydroxyls ofwhich paper fibers throughto hydrogen bonding, resulting in high affinity of polysaccharides chemical contribute good dispersing ability to inorganic fillers, and the to paper surface [14]; the long chain structure enables their molecules to tangle with each other, fillers can be dispersed and adhered to the paper surface more uniformly, improving the coating forming mechanically reinforced network [15].
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