超支化聚酰胺酯复合改性混合稀土氧化物的研究

通过AB2单体（由二乙醇胺和丁二酸酐室温反应获得）原位溶液缩聚生成超支化聚酰胺酯(HBPAE)对混合稀土氧化物（RE2O3, RE为La、Ce、Pr、Nd等）实施复合改性，获得了一系列HBPAE/RE2O3复合材料。采用红外光谱、元素分析、X射线光电子能谱、扫描电子显微镜、X射线粉末衍射、热重分析和分散性实验等方法，表征了复合改性前后RE2O3的结构与性能，分析了复合界面的作用特征，探讨了改性后HBPAE对RE2O3性能的影响。结果表明，AB2单体原位缩聚成均匀包裹RE2O3粒子的HBPAE，HBPAE与RE2O3在界面上有4.71 %的配位键接；复合改性仅在RE2O3的表面发生，而不会影响RE2O3的深层晶相结构；调整HBPAE 和 RE2O3的复合比例，可使HBPAE/RE2O3复合材料具有可调的热稳定性；HBPAE的复合改性还提高了RE2O3在有机溶剂中的分散稳定性。

Research on Mix Rare Earth Oxides Modified by Hyperbranched Poly(amine-ester)

Surface organic modification of ultrafine RE2O3(RE was La,Ce,Pr,Nd,etc) was studied.Hyperbranched poly(amide-ester)(HBPAE)was obtained from solution polycondensation of an AB2-type monomers(prepared in a reaction between diethanolamine and succinic anhydride at room temperature),which was compounded with RE2O3 and was uniformly coated on the surface of RE2O3 particles through mechanical stirring.The HBPAE/RE2O3 composites were characterized using FTIR,elemental analysis,etc,and compared with raw RE2O3.It was found that 4.71 % of HBPAE were attached to RE2O3 particles via coordination bonding,thus the modification was limited on the surface of RE2O3 and no effect on the crystal structure of bulk RE2O3 particles.The thermal stability of HBPAE/RE2O3 could be tailored by the ratio of HBPAE to RE2O3.