Pillaring Hydrogen Bonded Dense Structures of Chitosan for the Biosafe High-performance Humectant
Humectants with a large number of hydrophilic groups are able to increase or maintain the water content of a substance for a long time,which possess a huge range of applications in industries including medical care,food,cosmetic products,and medicinal herbs.Chitosan molecules featuring a variety of advantages of biodegradability,non-toxicity,anti-bacterial,etc,are investigated to be a high-performance humectant.Nevertheless,the dense structure originated from multiple hydrogen bonds leads to the inability of water molecules to access in the interior of the particles,which seriously depresses the material's ability to absorb and store water.In this paper,a covalent coupling approach was adopted to react benzoic acid with chitosan through a dehydration polymerization reaction.The hydrophobic phenyl units are able to columnarize the hydrophilic chitosan chains,forming a large-volume space for the storage of the water molecules.Based on this,the specific surface area of the as-prepared material is enhanced by about 1000％compared to the original chitosan;correspondingly the water-absorption capacity has been increased by about 400％.At the same time,cellular safety tests have shown that the chitosan-based porous humectant possesses good biosafety properties.After uniformly distributed on top of the damping papers,the amount of water loss of the paper is improved by 20％compared to the commercial humectant,propylene glycol.
Porous materialChitosanHumectantWater retention capacityHydrogen bond
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