Abstract:

A modified hyperbranched polymer was synthesized with diethylenetriamine and methyl acrylate as raw materials, maleic anhydride as modifier, and applied as template for preparing nano-silver sol. The influence of the dosage of modifier on the particle size of nano-silver was investigated, the effects of synthesis temperature and time on the ultraviolet maximum absorption wavelength and its intensity of the modified hyperbranched polymer were studied, and the synthesis conditions were optimized, the structure of the modified polymer was characterized by FT-IR and NMR, the particle size and distribution of nano-silver were measured, and compared with that of nano silver sol prepared with succinic anhydride modified hyperbranched polymer as template. The results showed the optimal conditions of synthesis process were that: n(MAH):n(DETA) was 1:20, the temperature was 150℃, and the time was 1h. Compared with that of the nano-silver prepared with succinic anhydride modified hyperbranched polymers as template, the particle size of nano-silver prepared with maleic anhydride modified hyperbranched polymers was small and its distributed was narrow. The results indicated that maleic anhydride modifing hyperbranched polymers can effectively reduce the aggregation of nano-silver.

Key words: modified hyperbranched polymer, maleic anhydride, nano-silver, partil size