PAMAM树形分子影响CaCO3结晶的机理研究

研究了不同端基的聚酰胺胺(PAMAM)树形分子以及CH3COONa,PAANa对CaCO3在水溶液中结晶的影响,分析了PAMAM树形分子影响CaCO3结晶体机理.研究表明,含-COONa端基的PA-MAM树形分子在CaCO3的结晶过程中与Ca2 发生络合,形成由Ca-O键连接的络合物,Ca2 在进入晶格时由于受到树形分子空间位阻的作用只能按照霰石的形式进行排列.含-COONa端基的PAMAM树形分子起到了晶体改性剂和结晶抑制剂的作用.

Investigation of the Mechanism of PAMAM Dendrimer Influencing the Crystal of CaCO3

The influences of the PAMAM dendrimers with different terminal groups,CH3COONa and PAANa on the crystallization of CaCO3 in aqueous solution are studied.The mechanism of the dendrimer influencing the crystal of CaCO3 is analyzed.The result indicates that PAMAM dendrimers with-COONa terminal groups complexing with Ca2 leads to the arrangement of vaterite.So the dendrimers with-COONa terminal groups are a kind of habit modifier and can influence the crystal morphology upon CaCO3 crystallization.