Fundamental Research on Polymer Complex using Chitosan

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The purpose of this work is to convert chitin or chitosan, which are low-utilizable biomass on the earth, into composite polymeric materials having satisfactory mechanical properties using a new synthetic method. The procedure is as follows ; dissolving chitosan into aqueous acrylic acid monomer, adding initiator, then UV curing to prepare polymer complex.From the solubility test of chitosan into various concentration of aqueous aclyric acid monomer, it was known that chitosan can be dissolved into aqueous aclyric acid monomerupto 20% of solid content of synthesized polymer.The above various concentrations of chitosan/acrylic acid monomer/water solution were polymerized by adding water soluble initiator and then UV radiation. It was known that various properties and forms of polymer complex can be produced, of which forms were from hard to soft and tacky, of which swelling were high to low. The maximum swelling in water was 20, which can be greater using chitosan from limited deacetylated chitin in order to lower apparent cross linking density. From raman spectroscopy, the absorbance derived from carbonyl groups shifted higher wave number with the increase of chitosan, which indicated strong interaction between chitosan and polyacrylic acid. The raman spectra of carbonyl for swollen films with water was shifted higher wave number and became sharp, which indicated the hydrogen bond was cut whtn swelled.From DSC thermography, the glass transition temperature of polyacrylic acid became higher with the increase of chitosan, which indicated good compatibility between polyacrylic acid and chitosan.