丙烯酸聚乙二醇酯-甲基丙烯酸共聚物对CaCO_3微粒形貌的调控

研究了两种聚合物-丙烯酸聚乙二醇酯（PEGA）和丙烯酸聚乙二醇酯-甲基丙烯 酸共聚物（PEGA-PMAA）对CaCO_3粒子生长的调控。发现PEGA调控下得到CaCO_3片 层状粒子的粒径比在纯水中的小，而PEGA-PMAA调控下的粒子粒径较大，并且长成 了奇特的花状形貌。这说明PEGA在CaCO_3粒子生长过程中起了阻碍作用，而双亲水 的PEGA-PMAA则促进了CaCO_3粒子的生长。

Morphological Control of CaCO_3 Particles by a Poly (ethylene glycol) Acrylate-block-(methacrylic acid) Copolymer

Poly(ethylene glycol) acrylate-block-(methacrylic acid) copolymer (PEGA-PMAA) having double-hydro-philic groups was synthesized and characterized. The morphology of the CaCO_3 particles formed in the presence of PEGA-PMAA was investigated, which was compared with the CaCO_3 particles formed in Lhe presence of poly (ethylene glycol) acrylate (PEGA) having single-hydrophilic group. The results show that the morphology of CaCO_3 particles varies with the polymers presented. The size of the CaCO_3 particles controlled by PEGA is smaller than that in water. However, the size of the CaCO_3 particles controlled by PEGA-PMAA is much larger. Especially, the flower-shaped calcite with large length of about 7 μm is very interesting. This indicates that PEGA prevents the growth of the CaCO_3 particles, while PEGA-PMAA promotes the growth of the CaCO_3 particles.