Abstract
Polymer deriving from nature as Chitosan, which is one of the most abundant natural polymers in the world has effectively antibacterial potentiality. However, chitosan is relatively difficult for applications due to its disadvantageous properties. In this article, modifying chitosan (CS) is the grafting copolymerization using monomer n-butyl acrylate (BA) and tert-butyl hydroperoxide (TBHP) as an initiator. This process purposes to attain product having lower glass transition temperature (Tg) than original chitosan causing a wide range of applications but still keeping the capability of being an excellently antibacterial agent. The effects of parameters on synthesizing copolymer were studied by determining the grafting percentage (G%) and grafting efficiency (E%). The results revealed that the highest G = 242% and E = 61% were obtained at the conditions as following: BA/CS = 4 w/w, TBHP/CS = 5 v/w with [TBHP] = 20mM, [CS] = 0.75% w/v in acetic acid 0.6% and reaction temperature 90°C in 6 hours.
Highlights
Natural textiles such as those made from cellulose and protein fibers are considered to be vulnerable to microbe attack because of their hydrophilic porous structure and moisture characteristics
Chitosan is one of the safest and most effective antibacterial agents widely used for cotton and other textile antibacterials [1]
CS from Vietnam is filtered after being completely soluble in acetic acid 0.6% (AA) (China); n-butyl acrylate (BA) (China) is purified by distillation; tert-butyl hydroperoxide solution 70% (TBHP) (Aldrich)
Summary
Natural textiles such as those made from cellulose and protein fibers are considered to be vulnerable to microbe attack because of their hydrophilic porous structure and moisture characteristics. Chitosan is a ß-(1,4)-linked polysaccharide of D-glucosamine, which is a deacetylated form of chitin, the second most abundant natural polymer in the world They are obtainable from the shells of crabs, shrimps, and other crustaceans. Especially grafting with different polymers is an important topic in the production of bio-based materials with enhanced properties. N-butyl acrylate was chosen because its homopolymer performs low glass transition temperature Tg and hydrophobic characteristics These two important properties could be tailored to chitosan to get the desired results in the final product as improving its water resistance and mechanical properties [2] whereas antibacterial activity is maintained
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