Synthesis of PAMAM Dendrimers with Carboxylic as Terminal Groups and Its Application in Chrome-tanning

摘要

The dendrimers with 4 and 8 -COOMe as outmost dendrons were synthesized by divergent methodology using ethylenediamine and methyl acrylate as raw stuffs, and their terminal groups were turned into -COOK by basic hydrolysis, and finally the hydrolyzates were applied to Sandwich chrome-tanning as auxiliaries. The result showed that: the chromium content in the effluent measured by Cr2O3 can be reduced from 2.1g/L to 0.2g/L, and shrink temperature of wet blue can be increased from 88℃ to above 100℃. The addition of dendrimers with 4 and 8 carboxyl as terminal groups can greatly improve collagen' exhaustion and fixation abilities for chromium salts, and moreover can improve the absorption capacity of crust for dyes and fat-liquors.