谷氨酸接枝纳米碳酸钙的合成

Study on synthesis of glutamic acid grafting nano calcium carbonate

纳米碳酸钙(CaCO_3)是一种应用广泛的无机填料,但由于粒度小、表面能高、亲水性强、耐酸性差等缺陷,在应用过程中必须对其进行表面改性。用谷氨酸接枝纳米CaCO_3,制备了改性样纳米CaCO_3。带2个羧基的谷氨酸、天冬氨酸改性样的活化度是带1个羧基的丙氨酸、苯丙氨酸、赖氨酸改性样活化度的1.7倍。FTIR分析和TGA结果表明:谷氨酸、L-赖氨酸是以化学键合的形式接枝到纳米CaCO_3表面,谷氨酸改性效果优于L-赖氨酸。

Nanometer calcium carbonate（ CaCO_3） is a widely used inorganic filler,but because of small size,high surface energy,strong hydrophilicity and poor acid resistance,it must be modified in the application process.The modified sample of nano CaCO_3 was prepared by Glutamic Acid Grafting CaCO_3. The activation degree of the modified sample of glutamic acid and aspartic acid with two carboxyl was 1. 7 times of the modified sample of alanine,phenylananine,and lysine with one carboxyl. The analysis results of FTIR and TGA indicate that Glutamic acid and L- lysine was grafted onto the surface of nano CaCO_3 in the form of chemical bonding. The modification of Glutamic acid was better than that of L- lysine.