Mg(OH)_2-PMMA复合粒子的制备及表征

Preparation and Characterization of Magnesium Hydroxide-PMMA Nanocomposite

为了减小纳米氢氧化镁较严重的团聚问题,通过在氢氧化镁表面接枝大分子聚甲基丙烯酸甲酯(PMMA)来制备氢氧化镁/PMMA纳米复合粒子,以提高纳米复合粒子在有机相中的相容性和分散性。首先,通过油酸对氢氧化镁进行表面修饰,在其表面引入双键烯烃基团,然后以丙烯酸甲酯(MMA)为单体,偶氮二异丁腈(AIBN)为引发剂,聚乙烯吡咯烷酮(PVP)为稳定剂,通过分散聚合的方法在修饰过的氢氧化镁表面接枝有机大分子PMMA。通过XRD、FT-IR、TGA、FESEM、EDS和沉降实验对所得Mg(OH)2/PMMA纳米复合粒子进行了测试表征,结果表明:有机大分子PM-MA成功地接枝在了油酸修饰后的Mg(OH)2表面上,纳米复合粒子在有机相中的分散性和相容性都得到了很大的提高。

In order to solve the heavy aggregation among magnesium hydroxide nanoparticles,PMMA-Mg(OH)2 nanocomposite was prepared by means of grafting polymethyl methacrylate(PMMA) onto the surface of nanoparticles.The obtained composite nanoparticles were characterized by XRD,IR,TGA,FESEM and EDS,and the compatibility with organic phase was determined by sedimentation test.The results showed that the organic macromolecule PMMA could be successfully grafted on the surface of OA-modified magnesium hydroxide nanoparticles,the dispersibility of PMMA-grafted magnesium hydroxide was greatly improved,and the dispersion stability and the compatibility of modified magnesium hydroxide particles in organic solution were better than those of unmodified ones.