端羧基PAMAM树枝状化合物的合成及其阻垢性能

Synthesis of PAMAM Dendrimers with Carboxyl as Terminal Groups and Its Performance on Scale Inhibition

以丙烯酸甲酯和乙二胺为原料,采用发散法合成了外围分别为4个、8个和16个—COOCH3的树枝状化合物(简记为MCMD4、MCMD8和MCMD16),在碱性条件下水解衍生为外围分别是4个、8个和16个的端羧基树枝状化合物(简记为MCD4、MCD8和MCD16)。水解衍生物用于模拟循环冷却水阻碳酸钙垢实验,结果表明,MCD4、MCD8和MCD16均具有良好的阻垢性能,MCD16、MCD8阻垢性能优于MCD4,在药剂用量为10 mg/L时,MCD4及MCD8的阻垢率分别为90%和96%。通过红外光谱及扫描电镜分析手段研究了该阻垢剂对碳酸钙垢晶形的影响,进一步探讨了该端羧基树枝状化合物的阻垢机理。

The dendrimers with four, eight and sixteen carboxylic methyl groups as outmost dendrons （denoted as MCMD4, MCMD8 and MCMD16 ） were synthesized by divergent methodology using ethylenediamine and methyl acrylate as raw stuffs, and their terminal groups were turned into --COOK （ denoted as MCD4, MCDs and MCD16 ） by basic hydrolysis. The results of scale inhibition experiment of the two hydrolysates used as scale inhibitors show that MCD4, MCDs and MCD16 have excellent scale inhibition on calcium carbonate, but the scale inhibition of MCD^6 and MCDs is much better than that of MCD4 ;the scale inhibitive rate of MCD4 ,MCDs and MCD16 are 90% ,96% and 98% respectively. The structure of calcium carbonate scale inhibited by the scale inhibitor was investigated by FTIR and SEM, and the scale inhibition mechanism of hyperbranched polymer with terminal carboxyl group was further explored.